I don't like the title, it gives the wrong impression. You don't want to fight it. It is your friend. You want the maximum amount of impedance rise while being perfectly on the balance point where mechanical limit is reached as the coils thermal limit is reached. Once this is achieved, you can calculate how low you can safely wire your amps down to yield the highest current possible. I run my amps strapped at 0.5ohm (0.25 per amp) daily and they stay cooler than they did at 1ohm on poorer subs.

@UnofficialAudio

5 жыл бұрын

No doubt I did the title that way on purpose to attract attention.

@georgethoman82

5 жыл бұрын

I got a fix for box rise i buy a bigger sundown amp 😉 LoL

@proffessasvids

5 жыл бұрын

Yeah boi the only time you should ever worry about rise is when doing a one note wonder design for dB drag. Choosing a coil configuration to maximize your amp output at your test frequency. In this case, the playing other tones where the inductance is lower can damage your lovely sundown amp. I always say, if you're playing music.. rise is what it is xx

@bigvell02

5 жыл бұрын

Glad to see someone else running at 0.5 strapped for 0.25 each amp. Ive had tons of people tell me I'm going to blow my amps. I have 2 DD m2b's and they run like horse with new shoes. Keep up the great stuff as well Peace and Bass :) :) :)

@spoom937

5 жыл бұрын

This dude stays with the clickbait titles lol! Love the videos though!

Simple for me. I always buy an amp that does double what my subs are rated for at the amps minimum safe impedance. 600 rms sub...1200 watt amp. 2500 rms sub, 5k amp. I would rather have the better efficiency of the bigger amp over wiring a smaller amp into the dirt.

@bigvell02

5 жыл бұрын

LMAO Story of my life right now. My set up is wired to the dirt, great electrical. I'm just like barevids 0.5 strapped each amp seeing 0.25

@timothyhinton5665

5 жыл бұрын

@@Supercharged1976 it's the opposite of a dead short. It's almost an open circuit.

@ert-wert

4 жыл бұрын

Hey so what's your opinion on running sfb 3k to a u18 rated @ 1.5k. It would be double the rms.. I'm being told to do it by a friend that's helping me get a pounding system foing and I'm unsure if he is blowing smoke up my *** or if what he is telling me is legit.

@Supercharged1976

4 жыл бұрын

@@ert-wert Absolutely. It's different for every build but 9/10 you will be seeing 2000 watts or less most of the time out of a 3k wired at rated.

@dabeardsmen3621

4 жыл бұрын

I was gonna say the same thing but a bigger amp

4yrs after the video was made I’m seeing this and so damn glad I found it. Very informative

This was a huge deal for me when I first found out when digging into the what’s what of car audio, great vid

Thank you for the simplified explanation. It helps a lot!

It's simple. Buy an amp that puts out the kind of power you are looking for at 2 Ohms. That way when wired to .5 or 1 ohm, if you rise to around 2 Ohms, it won't really matter because you will still be getting the proper power you need

@masterdebater8757

2 жыл бұрын

and then you run across a track thats got a signal in the hertz range where your setup flushes out at .5ohm and you dont have a .5ohm stable amp to handle it. dunno bout you but i dont see alot of half ohm stable amps floating around and for sure it isnt the norm. Was thinking out loud that if you know where that .5ohm comes into play and set the lowpass to chop it you might could get by with 1ohm stable amp running a .5ohm sub setup but is just a theory. Im a bit old school, maybe some these fancy DSP's can do that job to save a build from destroying itself.

@JasonWW2000

Жыл бұрын

@@masterdebater8757 Your never going to see it dip to 0.5 ohm. It will always be higher than what you measure on DC. You can do a frequency sweep at lower power to confirm.

@kennysimms5217

Жыл бұрын

Well I don't want to sound dumb because I'm just wondering but if you have two dual 1 ohm subs in parallel that will be .25 ohms before impedance rise would it be safe to say that once you get impedance rise it would be safe to be in that 1 ohm area that amps can run in? Or no?

@JasonWW2000

Жыл бұрын

@@kennysimms5217 The amount of impedance rise will vary based on the sub, enclosure, vehicle and frequency you play. It may only rise to 0.5 ohm and if your amp can't handle that it might go into protect or might damage itself. I would not assume a 4x rise. If I were wiring to 0.25 ohm I'd assume a 2x minimum rise and use a 0.5 ohm stable amp. Or maybe wire it to 1 ohm and use an amp thats 2 ohm stable. Those constant power amps are good for this. I would never wire a 0.25 ohm load unless it was a competition vehicle.

@KinqK00pa

Жыл бұрын

@@kennysimms5217 that really depends. Every build is different. One build might rise 1 or 2 ohms while playing songs while other builds may only rise .6-.8 ohms. Wiring an amp down to .25 is pretty risky. I know some that do it but you better hope your electrical is on point (plenty of agm or Lithium power, after market alternators, make sure you are grounded very well, have plenty of fuses, big 3 upgrade, etc). Otherwise you will end up burning everything up running at .25 ohms

I’m glad I watched this video. I just bought 2/15” hurricane cat.2 subs and came into a stetsom 8000 watt mono amp.The subs are rated at 2000rms and 4000 max.So I do have a use for that amp now.lol.I only bought it cause I got it for a steal. I’m glad I did now.

A few things: 1. A DIY impedance measuring jig and a free software tool like REW will graphically show how impedance varies with frequency, and how that variation can also vary at different power levels. That really could be of benefit here. 2. The subwoofer is actually MORE efficient at higher impedances in its impedance curve, all else being equal. That's because the power it absorbs is related to Voltage*Current, and the Current delivered into the subwoofer is less when the impedance is higher. And less power draw = less draw on the car's power supply = less voltage drop at the amp's power terminals. 3. Unless you're designing a system to have a big peak at one frequency for SPL competition purposes, all you've really got to worry about is if the amp is capable of swinging enough voltage into the subwoofer to get the output that you're looking for at the sub's MINIMUM impedance in the passband (usually 80 Hz and below, and because that's where the subwoofer's maximum power draw will occur), without exceeding the subwoofer's thermal or mechanical excursion ratings. As you suggested in the video, any impedance rise above that in the subwoofer's passband is not something to really worry about.

so . . . . resistance is futile? 🤔 😜

@vincentrobinette1507

5 жыл бұрын

Resistance is actually a good thing to know, when it comes to power handling capability. The current times itself, times the resistance, tells how much heat is being dissipated in the coil. Voltage is largely meaningless, because any voltage beyond the voltage drop of the coil, is actually motion of the speaker. That energy is the sound you hear. That doesn't contribute to heat.

@hippo-potamus

4 жыл бұрын

Assimilate into the Borg.

Still a great vid after all these years...thx bro

I use to love to fight and I was pretty good at it too. Impedance Rise I will be looking for that guy when I see him we will fight! I'm being silly - Great video bro! Look forward to hanging out with everyone in 2019 :) :). Sundown and EMF its almost like Bass University and learning from Bass teachers with PhD's. Seriously I use to go back and forth trying to explain that the impedance rises with different frequencies with out a box.

Fantastic video Derrick

Perfect explanation

Well explained Derrick.

Great video.👍

How I fight impedance rise..... get a stronger amp that does higher rms at higher ohm loads . Problem solved . Your welcome .

@unix696

3 жыл бұрын

Right or just wire half ohm knowing it will be over 1 ohm most the time anyways lol

@ryancapps1254

2 жыл бұрын

Or get something like a smart 3 where all loads give u same watts

@davidlewis8124

2 жыл бұрын

Or get a Rockford Fosgate T2500-1bdCP Power Series amplifiers actively monitor their speakers' performance using Rockford Fosgate's Constant Power technology. A speaker's impedance naturally fluctuates as it performs. So, just like your cruise control increases the engine's RPM to maintain your car's speed uphill, Constant Power maintains this amp's output by increasing its internal voltage and current when the speaker's impedance rises. This results in up to a 25% increase in the amp's total power output, especially in the crucial range below 50 Hz where a sub amp really has to shine.

@KillaSquant420

2 жыл бұрын

Exactly what I was going to comment lol

@212Tan

2 жыл бұрын

Ya I thinking bigger amp, smart 3 or Smart 5 lol he said don't worry bout it 🤣 FOH trying to send these coils to the moon and MF impendence rise killing the vibe over here. 🤷

Well said Derrick!!

I'm glad you didn't tell a bunch of people to wire there amps low, cuz I got 1 ohm or .25 ohm and I'm not about to wire down that low, but there is a way to beat the rise, and thats get more 1ohm power, having head room helps, need 5k get 10k.

Great video bro! well explained

Awesome explanation

Funny .. I tell guys this all the time... You have guys crying about this daily in those Facebook groups asking other MISinformed people and they come up with the most RIDICULOUS answers ..... Thank you once again... Hopefully people pay attention and learn something .... GREAT VIDEO once again....👍👍

Good video . i allways thought something was wrong with the people that try to fight box rise. Accourding to ur study. The surround being thick foam along with stiff spiders, i could see how it gives it big bigger rise on low frequencys

Box design can help fight rise at certain frequencies but most likely there will be a trade off at other frequencies. For obvious reasons he wouldn’t come out and say this but Jl and Fosgate Amps have current sensing ability to somewhat even out the power across the frequency range. Amp technology is like the carburetor vs fuel injection argument. Peaky and Dynamic vs Flat and predictable.

@thorlancaster5641

4 жыл бұрын

Subwoofer impedance rise causes power to go down, but it also causes efficiency to go up by the same amount. With a properly designed (voltage source) amplifier, box rise will not affect SPL output or sound quality whatsoever. If an amplifier were to "even out the power across the frequency range", it would be supplying more power when the impedance was higher. This would put a big hump in the upper bass response and make the low bass (where the impedance is lower) roll off a lot quicker. A current-based amplifier would also have a horrible damping factor. Sure, it would be great for some SPL applications but it would sound like garbage. Sundown wants their stuff to sound good, so they don't do it.

Nice I learned someting.

I did not have box rise until I watched this! Ha-ha!

So how would i set the gain voltage cuz at 2500 watts it should be 50 volts but since box rise thats means id have to set it lower?

With the 9 Nsv4 15s van can you show thing getting flexed around the sundown audio factory?

whats a good way for fine tunning so your not bottoming out your voice coil because i play all kinds of music like from bass bosted and on just trying to find out some better way of tunning i was 40hz 0db test tone

10:00 I thought the best thing we can do to fight impedance rise is to buy a stronger amp?

Been working with speakers for 20 years. Never heard of “box rise” before. I only knew of impedance rising at cone resonance or box resonances or from coil inductance. My favorite myth is that underpowered subs blow. If this were true, I would have destroyed many a speaker with an iPod (they don’t even put out a watt of power). Driving an amp into square wave clipping can over heat a sub though and fry it. Adding a low pass passive filter to a sub can be an insurance if the amp overdrives as it will reduce the higher order harmonic distortion and lessen the power and not hold the coil still with power running through it. Myths in audio probably get started from uneducated people and spread to other uneducated people. FYI, the video failed to adequately address why the impedance was changing. In the demonstration of the sub being tapped, the sub was converting the mechanical energy into electricity which would throw off an ohmmeter. In the demonstration of playing different frequencies, the impedance was changing due to the speaker’s mechanical cone resonance. Voice coil inductance was not mentioned either which raises the impedance as frequency goes higher and the inductance roll off the speakers response (this is generally not an issue with car subs as they are crossed over before coil inductance becomes an issue).

I will select each frequency. Then verify which frequency has the less ohm reading, then tune my enclosure to that particular frequency and since the ohms is very low, I will get the most power out of the amplifier and there I go!...I get a big score!

@paren8239

4 жыл бұрын

Bassotronics literally a legend

Good information

For Sure!!!

Impedance rise is a given, what I think people think with box rise is the additional resistance added to the coils with the subwoofer being in a box. Especially when the box is not designed properly (smaller air space/ port area)

Many years ago, stinger had an item called the acu match, which would keep the impedance at a steady level if I'm not mistaken. I wonder why that never stuck or became something gonna use today.

Impedance rise makes a lot more sense.

The way i understood to deal with impedance rise was to make or pick a box that gets the most exscursion withing the woofers safe max limits but yet have the correct size port and tunning frequency that pulls the max power within safe thermal limits the coil can handle. Impedance rise is a function of the woofer, theres nothing wrong with it but can sort of be controlled or in a sense tuned to get the max power efficiency of the amp and woofer by what box its in along with other things like the way its wired and the general ranges of frequency the woofer will be playing. Id imagine that the manufacture box building recomendations for their woofers incoporate the use of impedance rise to achieve a general decent amp power consumption and woofer performance effieciency. But impedance rise is very variable and not something that can really be completly controlled because how various the ranges the frequecy signals being sent into the woofer, unless you are only playing 1 frequency signal through that woofer then the box can be made to optimum size have a port tuned to get max power out of the amp into the woofer for that 1 frequency its playing since now pretty much ur whole setup your a tunning for is now a satic non variable situation. Im still learning about this subject so hopefully im not unintentionally giving bad info. But never the less that how i understand it at the moment. Very cool video though. The title did grab my attention since you used the word fight in refrence to fighting impedance rise or box rise..lol.

thanks man

RISE AND SHINE 👍

What if I do half a ohm will it be ok for the subwoofers?

Why does the cone excursion go down as resistance goes down? At 50Hz there’s higher current and more watts but the cone moves less

Nice video

ok questions. if a amp is one ohm stable and sub ohms always rise why cant we wire below 1 ohm and get away with it

Good vid man i wonder if companies should start putting specs for that independence rise but as u stated its if you really that worried about still good shit appreciate the info.

@UnofficialAudio

5 жыл бұрын

Impedance rise will be different in every setup so its impossible for companies to have a "spec" or "rating" for it.

which one will fuck your amp up, wiring 2 subs with different ohm loads but not under 1ohm, or wiring below 1ohm say to 0.5 to combat the box rise?

Hell yeah boi

Aaaaawwwwww yussssss.... Why am I just now seeing this!

9:20 What To Do? Simple, upgrade your amp to one that puts out at least 200% - 500% of what your subs total RMS ratings are. It's what I have found to be successful for my setup. 😁👍🏻

@akuma4u

3 жыл бұрын

Or build a bigger box

Whats name of this software you are using on your pc?

Great video! I really like when the answer is just forget about it! Can u do a video on subs that are in a box that is too big and one that is too small?

@slojoegtstang5775

5 жыл бұрын

Great video? What video were you watching? He explained the rise in resistance properly but he didnt tell you how to actually combat it which you can do in Box tuning. He didnt even show you the difference between free air and Box based resistance. They are very different because of Cone area resistance.

😂 awww man THANK YOUUUUU

Well I bought the taramp Smart Bass 8 and it fight rise so you get the most out your amp I rose to 2 ohms most stayed 1.8 and you still get close to 8k at 2 ohms so as long as I stay within .5 to 2 ohms I’m good and the smart technology helps you stay in that range I mean hell I’m sold!

In at least some cases when impedance goes up efficiency also goes up so you are actually getting the same output for less power thus reducing the strain on your coils amp and power system. It's not always a bad thing.

@ericremple6395

Жыл бұрын

????????????????

@maxfmfdm

Жыл бұрын

@@ericremple6395 I'll put it in words you might understand. Moar powa not alwasy needin mora powa to be moar!!!!..11111

@ericremple6395

Жыл бұрын

​@@maxfmfdm Not how it works idiot go to science class

@Gr8rome407

5 ай бұрын

It will never be more power or even the same power with impedance rise its the same as if you wire your suns to 4 ohms your amp with give you whatever its rating @4ohm never will be the same as power @1ohm

@maxfmfdm

5 ай бұрын

@@Gr8rome407 i seriously have to re-explain a 3rd time for you... there is sound pressure level power and there is electrical power. if you get impedance rise but also gain efficiency then you can still have good output in terms of sound pressure level. this is not just wishful thinking this is a literally reality for all subs. you have an impedance curve and also an efficiency curve. what matters is the sound output and if you can get that output for less power then its better not worse.

Great video.... I would say to beat rise just get a slightly bigger amp.

Can we talk about box parameters in the future? What makes a ported box more or less ideal for a specific sub? How does the box tuning frequency work, and is that specific to the woofer or to my taste in music? How does the box volume effect the speaker?

One thing I tell people is ambient temperature can affect impedance. I live where it's 10° in winter and 100°+ in summer.

it seems to me that if you do manage to minimize impedance rise you will in turn lower the effectiveness of the sub. i can tell you one thing you can do that will actually help though and that is to get a box or design a box to amplify your target frequency. resonance is your friend. lower frequencies are supposed to consume more power than higher but for me that is not the case. my setup makes a anything around 20-30hz ish consume less power than anything above that at least according to my voltage. i'll be honest i never actually clamped it to see the difference in amperage but that shouldn't matter when i can see my voltage dropping to 12.6 at 35hz but remain above 14 at 25hz.

Excellent presentation but i would like to add a few things... first and foremost including the word "rise" is slightly misleading, impedance is the technical term for AC and resistance is DC. With an AC signal the inductance of the coil causes the current to lag the voltage leading to a phase separation between the current and voltage (aka Power Factor) which leads to a "rise" in the collective of current resisting forces quantified as impedance. *****Z (impedance) = R (DC resistance) + jX(reactance, the imaginary component due to the AC signal)***** That is a "complex number" and the "j" is typically known as the imaginary number "i"(sqrt(-1)) in math classes. The erroneous readings on the resistance measurements were caused by Faraday's law, moving coil in a magnetic field induces a current. The multimeter uses a constant current source and measures the voltage across the "unknown resistance", by moving the coil you induce added current into the equation causing an erroneous reading. The real Z needs to be calculated from current and voltage measurements OVER TIME. In a single frequency situation one could add an appropriately sized capacitor to combat the phase shift caused by the coil inductance to a purely DC resistance load. An inductive load causes the current to lag the voltage and a capacitive load causes the current to LEAD the voltage, so one can deduct how a combination of the two would result in one cancelling out the other. In the impedance equation "Z= R + jX", X is defined by "X= Xc + XL" so if the coil represents the XL(inductive load) and the Xc represents the capacitive load so you can see how adding capacitive reactance would negate the inductive reactance resulting in a power factor of 1 or a purely resistive load. I slept at a Holiday Inn last night and have no clue where ^^^^ came from. For extra clarity... The reason "nothing can be done about it" is because the value of XL (coil reactance) varies over it's bandwidth requiring a Xc to change as well to maintain the corrected power factor. So by no means am I trying to discredit the information in the video, I wanted to add to the information from a technical aspect and explain how it could be addressed at single frequencies for peak output measurements without the need for a lower DCr coil so that the amplifier operates at it's peak output. The math to calculate the correct value capacitor is not hard, research "Power Factor Correction" if you are interested in the topic.

I purchased 2 DVC 4-ohm subs which I have wired down to 1-ohm but when I carefully measure them together they settle down at 1.6 ohms. This pisses me off that there's nothing I can do about it other than now needing to upgrade my amp from the 3,750 RMS up to a 5K. Right or wrong?

@dcole808

3 жыл бұрын

I checked the final ohm load when wired up too. Then, went up 2x-3x(per DD Audio) the final ohm load then I decided on the amp RMS need. Worked for me.

So it sets me back a bit I saw a video of a guy use a DD 1 set his gains correct on a 500w alpine amp Then when he played music he used another SMD tool like the DD 1. His impedence changed as you said it would but he clipped at 135w not at 500w How does this happen? Should we set gains according to impedence rise of a certain frequency or Set gains at the resting impedence? How did the guys amp clip when I just watch him set his gains correctly using a DD 1 then next thing on music it clipped at 135w ??

@JasonWW2000

Жыл бұрын

He should have set it so it does not clip at all. Anyway, its certainly possible to clip at lower power as the amps power falls off based on the load. 135w is probably max at the higher ohm load the amp was seeing.

Derrick would the resistance be at its highest around fs or fb ? Also maybe i missed it but does volume affect it or does it not change ..have an amm1 ill try today just incase u dont respond lol

@b1782w

4 жыл бұрын

Okay replying to myself after doing some testing for anyone who wants to know volume did change impedance but inversely was not what I was expecting at super low volume impedance was slightly higher does not change much but turning the volume up actually lowered the impedance by a couple tenths but in response to the other part of the question yes FS or box tuning frequency impedance will be highest at that point okay thank you Brian... You're welcome

I’ve got 4 vd-12s and I’m doing 140s in a 6.5cube box with a 10 inch aero but I checked it with the amm1 and they’re getting like 500w rms to all of them and they’re on a rp2000 I knew I should’ve gone with the 4500 but dam I’ve spent enough on everything. I would love to float the towel bigass ports sends with they’re ports and I think I could with 2k rms to them but I will never know because I have stock electrical and bigger amp a lil sketchy cause of that 😂

but cant the box design change the ohm rise?

Can you just get another dual 2 and run amp amp at .5 and will rise to 1 ohm.

@JasonWW2000

Жыл бұрын

Yes, usually. It may never go below 1 ohm or it might dip a little below. If the amp can handle that, it should be fine.

Does Sundown use actual dual VCs, or is it just once VC with 2 windings? For example, a B (no name) subwoofer has 2 Ohm DVC and the same B sub is available as 4 Ohm SVC, which is just both coils connected in series on the coil itself. So, does Sundown sub use DVCs that are ran the entire wining height? Also, if you wire the input to coil 1 then 8 gauge over to VC 2 in parallel, does the sound change because it takes just every split second longer for the power to get over to VC 2? What are you using to make the impedance measurements while also playing and showing V and A?

@JasonWW2000

Жыл бұрын

Almost all dvc subs have their voice coils running the full length, top to bottom. The voic coils are one on top of the other, though. They share the magnetic gap. They allow 2 different ways to wire them, either series or parallel. There is no noticeable time delay.

Basically @ 9:55 = "... Just, Send-It"!! 😎 🤔🤷‍♂️ .... 🤣🤣

The Rockford bdcp series is an attempt to fight this immense rise correct?

@sbeezynukka

5 жыл бұрын

kyle gray to a degree, but jl audios amplifiers are more geared towards trying to make maximum power from 1ohm to 4ohm where it falls on its face is once you get to 5ohm to 60ohm which happens while in play.

I want to get six ct sounds ozone 10's(would be 4800 rms total and 9600 peak total). they will be dual 4 wired in series parallel to 1.3 ohms total impedance, powered by a sundown salt 8k. would the rise be too much to get the 9600 watts peak with a salt 8k? or would it be better to get 2 or 3 amps for those 6 10's?

@LottoDub720

Жыл бұрын

2 or 3 smaller amps*

@LottoDub720

Жыл бұрын

because I have seen your video salt 8k dynoing at 6k watts at 2 ohms but forgot to take into account impedance rise

@LottoDub720

Жыл бұрын

also with have at least 9 cubes for those 6 subs

Don't fight it. Embrace it. 😎😎

Great demo this is good info for folks who are not yet familiar with the science of reactive subwoofer loads. You didn't mention the fs of the sub, that is a crucial piece of info to add to a benchtop demo like this. I do completely disagree with your theory that box rise is not a big deal and can be dismissed without much consequence. Port and enclosure tuning is crucial in ANY system, big or small, regardless of the cost or quality of the equipment you are using

@303nitzubishi4

5 жыл бұрын

Ronnie Smith didn't hit 150db on two 6 1/2s by ignoring box rise

How to fight it wire low and have a superb electrical.

So this means it's okay for me to wire two svc 4ohm sub with 2ohm wiring in parallel to a 2ohm load amp even if the sub is not rated for 2ohm?

@stevejr4185

3 жыл бұрын

@whatinthefuck shitniggadawg oh ok thanks bro 👍👍

@JasonWW2000

Жыл бұрын

Yes, its fine. Subs are not rated to 2 ohm, they are rated AT 2 ohm. Your 4 ohm subs are not exactly 4 ohms dc, they are close to it. With music they should not dip below 4 ohms. So wire them into a 2 ohm load as long as your amp can handle a 2 ohm load.

800-1000w rms sub on a 2.4k (less cuz was rated at 1khz), but wired at 8 ohms bridged ouch.

I consider box rise when u put a few subs n a box and have two dual one ohm subs and ur final load not being what it should be it rises higher than the math formula to

Once you install that sub into a enclosure you'll have different readings, this is called box rise and yes you can adjust it within the design parameters of the enclosure.

@FinancePro203

2 жыл бұрын

Absolutely correct. Can’t defeat it altogether, but with proper planning, you can take some control back.

@akolngto9314

2 жыл бұрын

So what is the best hz for our box sir regading wasting of power? Is it 32hz? Or 40hz?

@JasonWW2000

Жыл бұрын

@@akolngto9314 Every sub, every box and every vehicle will be different. If you really want to know, get a Dayton audio DATS3 and it can show you the impedance curve for your specific sub, box and vehicle combination.

OMG box rise. Will more power help??

That will change in a box . Because there will be resistance on the sub. Right?

@dbjunior1238

5 жыл бұрын

Yes. Different volume boxes and different tuning will change the impedence curve and spike size. What he didnt explain is when the impedence is at its highest is also the most efficient. The subs resonant frequency will be its highest impedence. When put into a box that will shift depending on box size and tuning. A sub unloads so easy below tuning because there is less box resistance and more power being delivered to the sub. At tuning box pressure is at its highest and power at its lowest. If you are competing you fight this with bigger amps. Daily and demo setups wont be able to push the power limits because of the lower impedence frequencies sending much more power to the sub during music.

@jamesbondcaraudio4247

5 жыл бұрын

Dbjunior 123 nice explanation 👍🏼

That's why you can wire 2 one ohm subwoofers together and it will never see a half ohm load when the impedance rises?

Customer service is half the quality of a company. I respect SA. EXO had custom coils made at I think .75 ohm in series to help combat this issue

You can get a Rockford fosgate that has constant power at all ohms. And I think it's important to know that if you check impedance while the sub is on its side, that will effect it and not always read right. Good video dude

Which amplifier fights box rise more? Full bridge vs half bridge?

@dead6last

2 жыл бұрын

.. taramps smart series

@JasonWW2000

Жыл бұрын

Full bridge and half bridge are amplifier topologies. It has nothing to do with what the speaker load is. Certain amps are designed to deliver their rated power over a range of impedances. Those are great. Taramps smart series as said earlier. Jl audio slash series, Rockford CP series, etc...

In other words... "shh... Just let it happen"

@slojoegtstang5775

5 жыл бұрын

Wrong. You can make it work in your favor he just didnt tell you how.

@jr1001jr

3 жыл бұрын

@Michael J ... just "Send It"!!! Lol 🤣

Great video! What's the Software on your laptop?

@UnofficialAudio

5 жыл бұрын

TermLab Magnum

@pierregervais1567

5 жыл бұрын

awesome!...thanks for replying!

To fight mine I just wired my sub to a lower ohm on the amp. You would need to run your system and watch the ohms so that you don’t hurt your amplifier.

@Had22s

5 жыл бұрын

Or get a SMD IM-SG and use it to see what your impedance is at all frequencies.

@Life_and_Love

5 жыл бұрын

Had22s I don’t need that to see what my ohms are at all frequencies. You can just use a good voltmeter.

I don’t even check mine I just wire it to 1ohm and Rock it. When it sounds distorted I turn it down. I run everything at about half to 3/4 gain and that’s always been about right! I set my amps so no one can twist the volume nob and blow anything. They can turn it to wide open and it want matter cause I got the gains down!

Can you please fix your audio level on your videos .they are always very low .thanks for all your cool videos.

So my question is with this is it better to have dual 2 ohm or dual 4 ohm subwoofers

@brandonreeves6391

4 жыл бұрын

Ones not better then the other, it just depends on the final ohm load you want... If you don't understand i can go into further detail..

@teamloudsavagez868

4 жыл бұрын

Okay thanks I meant to put this question in there too so with the impedance rise so when I find out when my subs hold 1 ohm at a certain tone do I need to build my box to that tone

Fight box rise with a box tuned properly. Free air is the worst impedance and sealed is more stable. Box demention and port will significantly improve how loud a note gets. If it's still not enough then up the wattage.

To manage my raise I wired down low to 0.5 ohms goes to 1.1 ohms on really cold days I’ll stay 1 ohm flat

Nice video, some people would say buy an amplifier that does the same power ratings 1.5- 4ohms. Like a jl audio or fosgate amp. But I agree with what @barevids said, use impedance rise to maximize and utilize your system properly.

@AndrewB23

5 жыл бұрын

Or like you said at the top buy an amp that can do the work for you, and have a clean signal.

@slojoegtstang5775

5 жыл бұрын

What video were you watching. This video was crap! He explained how it functions basically but didnt tell you the most important part and that is you have some control over it with your box tuning.

I have a JL 250/1 slash series with the regulated power supply in it. Does this amp adjust output based on box rise or only based on the base impedance of the subwoofer? Something I've always wondered.

@JasonWW2000

Жыл бұрын

A regulated power supply simply means that it can output the same amount of power over a variety of input voltages. In other words it can probably deliver rated power if you feed the amp anywhere between 10 to 15 volts. It really has no effect at all on the output power.

@JasonWW2000

Жыл бұрын

Some of jl audios other slash series amplifiers do have a type of constant output from 1.5 ohm to 4 ohm. Not the 250/1 from what I can see.

@Thezuule1

Жыл бұрын

@@JasonWW2000 the OG slash series 250/1 has a regulated power supply. Still have mine. You say it has no effect on the output power but that's entirely the point. If I give it a 1.5 ohm load or a 4 ohm load it makes sure the output power remains the same. My question was if it compensates for fluctuations in resistance caused by box rise. If my 1.5 ohm subwoofer rises to 4 ohm during operation a typical amp would be putting out around 1/3 the wattage but one would think a regulated power supply could adjust for that. I just don't know anyone that can answer the technical end of that.

@JasonWW2000

Жыл бұрын

@@Thezuule1 I think there's some confusion. The ability to output similar power from different ohm loads happens in the output section, not the power supply or input section. The power supply is what takes 10v-15v or so DC from the battery and steps up the voltage that the output section uses. So a regulated power supply is able to maintain the same high voltage AC that the output section needs across a range of DC input voltages, like 10v to 15v. So when there's a big draw of current and your battery voltage dips low, the amp can still maintain rated power. The part where the amp outputs similar power from 1.5 ohm to 4 ohm is a separate output section design.

@JasonWW2000

Жыл бұрын

@@Thezuule1 To answer your question, just look at the specs of your amp. It should clearly say the power output at different ohm loads. The basic way these output sections work to deliver the same power at different ohm loads (at least for Taramps Smart series) is they design the amp to make full power at 2 to 4 ohm and as the impedance goes lower they kinda clamp the high voltage rails to prevent it from trying to output more power. The way they do that is quite complicated. Different companies use different techniques. I just looked up a JL amp, as I'm not familiar with them, and I see they use some confusing terminology. They say "The regulated power supply allows this amp to deliver its rated power to a wide range of impedances (1.5 to 4 ohms), even when voltage levels drop during heavy use." So apparently they are using their own design which does utilize the power supply section in some way. They don't get in to details, though. Thats interesting. So traditionally an amp with a regulated power supply like from the 80's, 90's, 2000's, usually class AB, is just to help the amp do rated power regardless of your battery voltage. JL is using a more complicated setup that uses a regulated power supply to help the output section do rated power across different ohm loads. I hope that makes sense. So as far as your model amp, what do they rate the output power as? Does is say the same power from 1.5 to 4 ohm?

power compression or thermal compression is a loss of efficiency observed as the voice coil heats up under operation, increasing the DC resistance of the voice coil and decreasing the effective available power of the audio amplifier.

Yep just let it go in one ear and out the other....😁

In my world this is why we have program power and rms, basically double rate your amplifiers, as they will always half,,

It's crazy this video came out I'm torn between redoing my entire setup becuase I was rising to 2.5 or I was going to just take out my 15k and do 2 8ks

@IcebergSlim803

3 жыл бұрын

I was told 2 amps could actually be worse than 1

@nebraskaninja1984

Жыл бұрын

​@@IcebergSlim803 actually it cuts the rise

Is it better to wire under ohms to fix this problem. I got 2 Hifonics Brutus amps wired to 2ohms bridged should I wire it to .50 bridged .25 ohms per amp to get more out put seem how after rise its seeing way over anyway?

👏

I metered for the first time today and I have a DC Level 4 18 wired down to 1 ohm on my skar 1500 and it was rising so much that it was only putting out 400 watts

@ert-wert

4 жыл бұрын

Are you serious? That's really interesting...

@ert-wert

4 жыл бұрын

And depressing...have you upgraded since then?

@kwonpae-corr4300

4 жыл бұрын

@@ert-wert yea it was the box rise because it was a weird box and ive upgraded again and now have a sundown 3k and meter 147.1 at 40hz outlaw

@ert-wert

4 жыл бұрын

@@kwonpae-corr4300 the sfb 3k? I'm bout to scoop one up myself and throw it on a u 18"

This doesn't explain thermal rise. Please leave your meter on ohms across a voice coil and place the voice coil above a heat source to bring it up to full operating temp. Then let us see how much the impedance rises. We can't control frequency-based impedance rise but we may be able to design for thermal rise if we knew what it is. Thanks!!!

Like Bruce lee said- the art of fighting without fighting. And SMACK don’t look at the finger or you’ll miss all of The heavenly glory.