We just re-ran the test with 13.2 volts and the amp outputs 64 watts. We also re-ran the test at 16 volts and the amp output was 98 watts. The amp went into protect after 2 minutes of testing at 16 volts. As part of next weeks VLOG we will show the results. The spreadsheet has been updated on a separate tab with the new results.

@justinmurphy2227

7 жыл бұрын

So it gained 34 watts with only 2.8 volts added in? Wow! That's pretty nice wouldn't everyone agree? Imagine if it was 1000 watt amp..... Doesn't this sound a like a little shitting around to anyone else?

@wesleyd.7433

6 жыл бұрын

Quality Mobile Video Funny, i was thinking (while watching the fluke readout drop down to 11v range during testing) that id be curious to see 13.5v constant supply test results... And here we are. Great in-depth reviews/info btw.

@barrygoldwater9450

6 жыл бұрын

Quality Mobile Video any chance you could test the alpha sonic forte self powered PA system? 2800 watts for 200 bucks. It seems to work better than I expected.

@zrafferty

6 жыл бұрын

Quality Mobile Video at what ohm. I seen amp do best at 4 be 1

@NVMDSTEvil

6 жыл бұрын

probably about 200-400w actual output, the first 200-400w is plenty for 95% of people.

Wow, excellent vid! The amount of detail and testing was impressive. 😎👍

@Qualitymobilevideo

7 жыл бұрын

Thank you! Your work is excellent, I love all the dyno wok.

@mattimus1895

6 жыл бұрын

that was big d wiz and he's OUTA HEEERRRREE........

@johncoops6897

6 жыл бұрын

Pity that this guy doesn't test in a scientific or repeatable way, like you do.

Lol, you put more thought/testing into this product than Dual would ever think to do.

@Qualitymobilevideo

6 жыл бұрын

Lol

@v8powergaming423

6 жыл бұрын

based_will right I'm like dual would give a shit less LMAO

@iunnox666

6 жыл бұрын

Too bad, they used to make some really nice turntables.

New Link to the Google Doc: docs.google.com/spreadsheets/d/1pPmpLwSTc0fNWmqZpi2V9TsH4c6iXScafqmJ2w1ebZA/

is this the *linus tech tips* of car audio?

@Qualitymobilevideo

6 жыл бұрын

Thanks for the compliment! Yes that is our intent.

@SianaGearz

6 жыл бұрын

I think, or at least hope, it's better, because LTT runs on entertainment value that they usually derive from a sense of humour, but often from incompetence and random failure, and the rest of it is, how do i put it nicely, maintaining healthy press relationship with the major manufacturers - i have seen much worse cases, so i don't want to be too critical, and having worked in the tech press myself, i know it's almost unavoidable, which is why i quit, but still. LTT is not a very good source of actual knowledge.

@SianaGearz

6 жыл бұрын

Oh that was almost 2 decades ago now that i used to be a tech journalist. I have since worked as an engineer in electronics industry for a decade, then dropped that and went studying linguistics and working in high performance computing research. If the world gets consumed by a massive evil AI running on a cluster of Xeon Phi and NVidia Tesla one day, that's likely partially my fault now. But at least i can be honest now, right? Also i may have left some bugs in automotive firmware and medical devices in my prior career - none major that i specifically know of and not on purpose of course, but that's how it is.

@Ormmwar

6 жыл бұрын

Nope, he didn't drop anyhing.

@G-spotGeorge

6 жыл бұрын

Siana Gearz so then the Louis Rossman of car audio then?

This kind of shit goes over many average consumers heads. They see big numbers and they get excited. I'm glad there's youtube and knowledgeable individuals like yourself to open the eyes and minds of the many sheeple who really have no clue as to what they are buying. Great video btw.

@Qualitymobilevideo

7 жыл бұрын

Thanks!

@firebirdude2

6 жыл бұрын

Been that way for years. Hence why nearly every big name company has resorted to putting "peak" numbers on their boxes. Tired of noobs thinking "I can get a 1000W amp from WalMart for $50" :-/

@TheOriginalSycHolic

6 жыл бұрын

big numbers? where? a spl of 86db is crap, go by some Cerwin Vega's and be happy powering them behind a 100w class A amp cuz ya know they make about 100db from 1w (which is what SPL ratings are based upon)

@TheOriginalSycHolic

6 жыл бұрын

lol jon what hes talking about fake #'s you see that more in home audio. example a 1200w output receiver, that has a input wattage load of only 230w. so where did the extra 1000w come from, thin air? but thats mainly amp makers not speakers.

@perryalberti2819

6 жыл бұрын

istishhadi I

Great job on this video. Thanks for providing clear and precise information and not opinions as is mostly done nowadays in car audio. More young consumers need this kind of information.

Who hasn’t bumped shit subs at one point?

@Qualitymobilevideo

6 жыл бұрын

It's a right of passage lol

@deanslegos1990

6 жыл бұрын

Neon Bass seemed like everybody them dual 2 12 bandpasses from best buy around 2005

@RSx94

5 жыл бұрын

I'd rather use cheap shit subs with a perfect enclosure than an expensive sub with a shit enclosure.

@Biggchad

5 жыл бұрын

@@RSx94 Plus I dont feel as bad blowing a $30 dual compared to a $800 Sundown ahaha

1n 2005 I assembled and installed a showcase sound system in my car for our high-end car stereo shop. Eclipse AVN and JL Audio equipment was installed and to this day the equipment still performs flawlessly and has never been abused or removed/replaced. Sure, the head unit lacks features, the CD Changer is a bit antiquated, and the navigation system can no longer be updated. But, all features work including the iPod interface. If you buy good equipment and install it correctly you'll more than get the initial investment back in longevity. This video was great and used testing I have never seen in real time. Remember, if your new amplifier comes with a data page and the ratings are at 14.4 volts DC you won't get the advertised power. Car electrical systems run around 12 volts in the real world when you're driving.

How about doing this same examination on a $1000 subwoofer and see if they also as truthful? Obviously its going to be better, but you can verify the amplifier power, the subwoofers output and power handling and the box design and materials. You'd be surprised to learn they also fudge the numbers. Please do this also.

@Qualitymobilevideo

6 жыл бұрын

It's part of the plan!

@johncoops6897

6 жыл бұрын

naturalbornkillr - this guy doesn't even have the equipment and skills to properly test this

@FirstLast-ej1my

6 жыл бұрын

John Coops #1. Give us the reasons he was unable to under your standards. I would really like to know. #2. Who do you recommend better than him? #3. Are you and electrical engineer and audio technician who knows a great deal? If so please provide all of us with whatever qualifies you as a trustworthy source of information.

@johncoops6897

6 жыл бұрын

#1 - it's not my standards, it's about using scientific methodology. I have no idea what the reasons are that these people don't test things properly. #2 Old School Stereo (BigDWiz) is the first person who comes to mind. kzread.info #3 Yes I am an electrical engineer, but no I am not an audio technician. I don't need to prove my trustworthiness, as what I am talking about is stock-standard physics, as well as 100% common sense.

@johnathoncarter8820

6 жыл бұрын

naturalbornkillr check sundown audio subs, they fudge their numbers on a good way, the sundown x12 (550$) is rated at 1500w rms however most people recommend running 2000w with some people running up to 2500w with no coil heating. they're amps also perform slightly better than what they're rated on dyno's. however there amps are fairly expensive. the 2000w amo cost like 700$

And to think that this was my introduction into aftermarket car audio. Ran the 10" variant for about a year before stepping up to a Dual 12" in a sealed box, paired with a Dual amp. I enjoyed that for awhile too.

Absolutely outstanding. Please continue this series forever

@Qualitymobilevideo

7 жыл бұрын

We will!

I'm just passing by here, but I'd like to point out that although this is still a rather small channel, it already has a very high quality (audio, camera, b-roll, and most importantly: *NO THREE MINUTE INTRO*). Keep it up, man!

This is what quality KZread video looks like. Just a total slam dunk. Congrats

@Qualitymobilevideo

6 жыл бұрын

Thank you!

Not only did your video, and in-depth analysis impress me, (not that I would every buy that system), you have forced me into liking your channel. Because you know, "Science"! Bravo on a most excellent job well done and video! I am a fan!

@Qualitymobilevideo

6 жыл бұрын

Thanks Alex!

I did a 15" with a 6 cubic foot box tuned at 35 and hit 139.3db on a Rockford Dsm 100. That works pretty good. Still the same set up I use today.

I got 2 500 watt 12" subs for $60 from Walmart about 4 or 5 years ago and for and they are good for the price

I would be curious to see how this sub and box output could be improved with a different amplifier.

i honestly feel like this is a "starter system" like something a 16 year old would put in their first car. it's not a terrible product its just entry level.

@RWL2012

6 жыл бұрын

It is terrible. Very terrible. Undersized and underpowered and tuned way too high. 75Hz WTF?!?!

@form109

6 жыл бұрын

that would describe a majority of Consumer grade audio. car & home alike. for the Target Demographics this product fits the bill....its Loud,Boomy, One Note Bass meant for the bottom of the audio market LOL

@williamnixon4056

6 жыл бұрын

Hahaha when i was 16 i had two memphis m3's now that was a good starter system.

@williamnixon4056

6 жыл бұрын

dangzard let me guess they were made by boss.... Lolol or was out dual

@willboy2k

6 жыл бұрын

Lol I’m 17 and I got a 3000 watt planet audio and a 15” quantum audio with a custom box

I really wish I had videos like this when I was doing car stereos. I was one of the few teenagers who actually learned about Ohms law and how box construction, port design, and acoustics played into sound quality and sound volume. Not to mention the basics like correct wire sizing. I don't know how many times I blew the doors off of a 2000w system some dude's parents bought him with my 800 watt Audiobahn, 2x 12" Audiobahns in a custom ported box, and a Bass Mechanics CD.

My sub is a Skytronic 8 inch which says 250W RMS, 500W peak power, and it bottoms with a 100W amp

Thank you, finally someone answered my prayers. Complete and comprehensive testing, outside and in a vehicle to note the transfer function and Spl. Subscribed!

@Qualitymobilevideo

6 жыл бұрын

Thanks Larry!

@bonzainews

6 жыл бұрын

I have to say I am very impressed. I asked people that create complex subwoofer enclosures such as 6th order to please graph the frequency response in and out of a vehicle and got cussed out for being curious and inquisitive. It's my opinion that if you can't or won't objectively test a unknown design why would people tout it as the best design? These people must be pandering to a youtube dumbed down crowd. Your testing of the subwoofer went above and beyond. keep the videos coming!

@Qualitymobilevideo

6 жыл бұрын

Lots more to come! Starting a Ferrari Installation, first episode is Saturday morning!

Why testing with an iPhone it has less than the rated vrms input spec for audio?

to do near-field measurements of ported enclosures you need to measure at the port as well and cross over the measurements usually below 200-300Hz

This is the kind of guy I trust for my vehicle alarm. good video.

Correction: at 08:00, +10dB is a factor of 10 in power, not 3. The Amp Power test seems a little unfair at 12V, most of the time the amp is receiving round about 14V and most amps are specified at 14.4V. But i'm sure it won't produce 100W rms at 14.4 either. Still a very good, semi professional review.

There's many sales trick out there,like they wondered why I wanted to do the electrical trade & I have been unemployed for almost 6 years,one of the modules that I did was amplifier principles which was a post trade industrial electronics strand of that course at tech - yeah !!! Why did anyone think that I didn't want to do that ???? Such as,I didn't get sucked in by the marketing tactics of watts PMPO (peak music power output) which means that is its power output assuming that the output signal is DC (direct current). AC (alternating current) is usually the output signal which is less than the DC component, the only speakers which come close to consuming DC is the subwoofers as the higher frequencies are filtered out by a Lowpass filter so they only operate at a few hertz (almost DC). The things to look for is both magnet size & impedance which is the AC equivalent of resistance ,which is actually the impedance at DC level. Meaning ,a stereo rated to run 100 watt speakers which have an 8 ohm coil impedance can technically run 50 watt speakers which have an impedance of 4 ohms. My dad used to have a Pioneer stereo which you could turn the volume up full blast on but the speakers will not distort,I think it was because it had a MOSFET (metal oxide semiconductor field effect transistor) amplifier in it whereas the older stereos would clip or distort because they had a silicone or germanium transistor amplifier in them which their bias is more current dependent. MOSFET amplifiers rely more on voltage for their bias.

you said you maxxed the output of the iphone. which iphone and does it guaranteed not clip ? i know that from the iphone 6 on there is a lot of electrical noise induced

7:58 +10dB is 10 times more power and not 3 like you mentioned in the video. Their power rating of 300W is probably PMPO which is a dubious type of rating anyway. My guess would be 30W RMS (120W peak) at best

@Qualitymobilevideo

6 жыл бұрын

You are correct, we did make a mistake here.

This is unrelated to this test, but I bought Vm audio 12" ported sub enclosure (supposedly rated at 4800 watts). It's not a bad package to be honest and really does sound good, but I'm certain the specs are exaggerated. I would love to see you do this test on the "4800" watt VM audio 12 enclosure package. I love your videos, keep up the great work!

In the mid nineties' worked for Radio Shack while I was in college. They were bad about overstating the specs on their car speakers, amps, and power converters. You had to read the very small print. The box an average speaker would be in, would say it could handle 2500 watts (some times more depending on model) but the fine print would say 2500 watts peak for 2mins, the speakers could really only handle about 30watts constantly. Same with their amps and power converters, always stating in big bold letters and numbers the peak power, and small print for continues power.

I put one of these in my lil brothers sun fire for him. It hit awesome but he got his Memphis 10 so we cranked the alpine 500w all the way up. Surprisingly it went a whole entire day before she blew! For a $30-$50 sub from Walmart I was actually pretty impressed. Note: we did not have the single set up shown. Bought the dual 12 from Walmart and put in in an old cheap $30 box I had and strapped it to a alpine mini block m500

@Qualitymobilevideo

6 жыл бұрын

LMFAO!

First time visitor to the channel - definitely appreciate the objective review that gets down and dirty into the real-world results. Subscribed.

@Qualitymobilevideo

6 жыл бұрын

Thanks!

Unfortunately this happens all day long. Manufacturers are very rarely interested in building a product that is truly worth the money to the end user. If they do, they'll make you pay for it.

It's interesting you mention a single 8" doing 150 dB because I did it 4 years ago, sealed, on the dash. It's in 151's since then and 154's in the kick.

You know, if auto manufacturers used marketing "tricks" to pad the output horsepower claims of their vehicles, or computer manufacturers did something similar to their advertised specs, there would be lawsuits of false advertising etc. If we lie or misrepresent a product we offer as part of a financial transaction, we risk being charged with fraud. How is it audio product manufacturers seem to be exempt or immune to these penalties? In the video, they address the 100W/300W ratings, and suggest it's an arbitrary claim that the peak response may "sound" like 300W. Well first of all, wattage ratings don't have any particular sound level, it is input power only, second, speakers don't output the watts they receive. Third, there was no explanation about the 100WRMS rating. Fourth, when they are specifying power, that's what they should actually mean! I saw a few soundbars out on display with suspect wattage ratings and I decided to check the rear... because being self-powered they were required to state their maximum power consumption. I was bewildered... They were all corrupt, but one I remember in particular was rated at 160W, but the power consumption was rated at 35W... What the actual fuck! And all those mini home theatre systems in a box, with an amp/receiver about 1.5 inches thick and no fan or heat sink. Same deal... 800W... but only 75W or so power consumption. This is utter bullshit and it needs to stop. Consumers are being lied to, ripped off and nobody in a regulatory position is doing squat about it.

@Qualitymobilevideo

6 жыл бұрын

More informed consumers would go along way. That is our intent both good and bad.

One of the most important parameters is harmonic distortion versus output for a given frequency. The ported design gives a high system Q and a steep falloff of 24 db per octave below system resonance. True low distortion woofer enclosure amplifier arrangements even for high end audiophile equipment is still rare. The optimal design is the acoustic suspension design. Newton's second law of motion applied to forced oscillation explains why by examining the equation for the approximate result. This is given in every textbook of first year physics for engineering and science students.

Wow, awesome video! After long time, I see somebody doing review while he knows what he´s doing. Thumbs up! More power to you!

Great video, if you are doing more of these you may consider using a tool my company makes called the AMM-1

@Qualitymobilevideo

7 жыл бұрын

+Anthony Damore yes absolutely, we have been wanting to reach out to you, what's the best way to discuss getting one?

@neverwalkalone7081

7 жыл бұрын

Pretty sure they are sold out on his site. I should probably let him answer considering it's his device(an amazing one at that),but there are other places to get one. Pretty sure everyone is somewhat affiliated with D'Amore engineering to be able to sell them. Definitely a game changer in car audio.

The one test that you performed that I don’t believe is absolutely reliable was the packing peanuts. I’ve never had much luck with that method because the packing peanuts can lay against each other different each time they’re poured in. But if it’s working for you great. Now I use an IMSG & for a volume of a vented enclosure I’d block off the vent from the outside. This gives you the ability to accurately calculate the final enclosure volume including driver displacement. You can also find the tuning frequency of a vented enclosure and plot impedance rise. Overall good job. It’s just unfortunate that consumers will learn more from your video than people in the industry. Because so many already know everything. Just ask them & they’ll tell you!

It's tuned to 75hz??? LOL

@Qualitymobilevideo

7 жыл бұрын

Yea man!

@critical_unknown

7 жыл бұрын

thornygravy lol annoying bass lol

@RWL2012

6 жыл бұрын

WTF, that's not a sub!!!

@Matthew19002

6 жыл бұрын

My old Panasonic system was tuned to 70hz.. with 5-1/4" woofers lol

@WeKnowTheTruth2012

6 жыл бұрын

thornygravy a regular woofer can do 50

how is this legal???? stereotypically companies would exaggerate the peak number and then be honest on the rms value. .. . BUT 50-60 WATTS IS NOT EVEN NEAR A 100 WATTS. . . . as a DJ, producer, audiophile and just all arround audio fanatic it pisses me off that you can not trust these companies. . .

@abelincoln7473

6 жыл бұрын

because it will do 100w for a fraction of a second at a very specific frequency....

I have that same el-cheapo 12" Dual... I blew the port right out of the box after about a year, half-blew the driver within hours afterward. It worked awesomely in a single-cab pickup (I've aged past the days where I need my windows to rattle), but once I put it in the trunk of my Camry its deficiencies were obvious - I cranked it waaay too much just to hear it, and that's when the port and driver gave up. However, I did get what I paid for it, and it wasn't too bad considering it was $100.

Dope video. Nice break down.

I like cheap non-linear response amplified sub-woofers, they are so cheap and convenient.

@tonykartracer8032

6 жыл бұрын

Bahahaha.... this made me laugh for some reason.

THE AMPLIFIER IS BETTER THAN WHAT I THOUGHT

Sundown, DD, DC, Fi, Ground Zero, Image Dynamics, and Orion are some of the best brands there is !! I first bought Kicker so I learned the hard way

Wow, great information and way above my level of understanding. I have a new 2017 truck and feel the speakers (sound quality) is really poor.... I found this video searching for ways to investigate and/or fix my issue.

This is a good way to learn how to build a good system. Let others make mistakes so you can avoid them

Excellent! We need more people like you exposing the lies from audio manufacturers!

i have a sub and amplifier both marked at 300 Watts, i did put a 10A fuse in between the power cable, that burned out, so now i have a 15A fuse and that one is still alive. that does mean it is between 120 and 180 Watts, btw that sub and amplifier are atleast 30 years old

As an honest retailer, this kind of marketing crap is the bane of my existence. I have really nice equipment for which my manufacturers are very conservative in their ratings. Unfortunately, despite my best explanations of the "numbers games", too many customers say stuff like "well, I can get a million watt amp for like $50 on Amazon." NOT even remotely the same product, buddy.

Nice work! About the only thing I might suggest for this type of tear-down is to grab a calibrated mic and some software (such as Room Eq Wizard (free)) and do some frequency sweeps rather than increments of 10dB. You can do one sweep from ~20-100Hz in front of the driver, then stick the mic in the port and do another sweep. That'll tell you exactly what the tuning frequency is.

@Qualitymobilevideo

6 жыл бұрын

The audio analyzer PAA-3 is calibrated, that is what we use.

@Kcducttaper1

6 жыл бұрын

Hows come you only run a single sine wave at 10Hz intervals rather than a full sweep? Kinda like doing an engine dyno at 1,000 RPM intervals instead of a full pull IMO. A lot of valuable info can lie in between the test nodes.

Nice vid! Great quality channel! Love talks demos too! Keep up the great work!

Nice! I would have chosen for a larger cabinet size. The Frequency response at 75Hz isn't the worst, however, cutoff at 60Hz is pretty high. I would have rather had +3dB at 55Hz, than +10dB at 75Hz.

have the mystery mjs-10 subwoofer for 4 years. love it.

Wow! I'd like to see this kind of testing like in a consumer reports setting for car audio .

As soon as you pulled the amp out it looked like a duel push-pull 70w unit, that is 35w peak to peak. RMS is more like 18 + 18

the best video i had ever seen...

The next test would be to feed the woofer a 100W test tone from a known good amplifier and see if it can even handle the supposed rated power. After all, if cutting corners on the amp, why not also cut corners on the woofer too?

Nice video and information. I know this took a lot of work. Keep up the videos like this!

@Qualitymobilevideo

7 жыл бұрын

Thank you!

By identifying the amp IC and looking up the Data Sheet you'll know all input, output and voltage, specs. Then you'll know exactly how they're cutting corners in production

Nice....entertaining and informative

Very nice video , enjoyed the thoroughness of testing and all the explanations .. Excellent work !

@Qualitymobilevideo

6 жыл бұрын

Thanks!!!

I was not expecting a video this well made.

@Qualitymobilevideo

4 жыл бұрын

:)

Great video cant wait to see more vids on more products great job👍👍

Thank you so much for this video, as an ECE senior this was super interesting!

@Qualitymobilevideo

6 жыл бұрын

Glad you enjoyed it!

@WildEngineering

6 жыл бұрын

If you're into digital design you should check out my youtube channel haha :p

I was surprised by the amount of detail you provided. Thank you and of course I subscribed

@Qualitymobilevideo

6 жыл бұрын

Thanks Odell!

the lack of power of the amplifier, doesnt really mean its under powered. i just means that the higher notes are limited to what it can do with the lower notes. i bet that 50 rms is enough for it to get to xmax at 25 hz. so instead of letting it get power to get xmax at 50hz, and have it bottom out at 40hz, and get all destroyed, they let it be a wider range albeit subdued. that i my impression when i saw the incar out put at 30 hz right up there with the 100hz

Nice work and nice methodical approach. It's been a long time since I played with car audio but you've peaked my interest here. Sub'd

@Qualitymobilevideo

6 жыл бұрын

Awesome!

Yeah they sell these things on "Peak" power, but its the RMS that matters in overall output. The sub itself looks like its decent quality though. So maybe one could get an external amplifier, and use the volume calculations and spend the extra $5 on a better tuned port, if it would actually be good?

Very nice analysis. I like the idea of using the packing peanuts! Nice Video!

@Qualitymobilevideo

6 жыл бұрын

Thanks Jonathan!

I never listen to music in my car, but watched this anyway ... :)

Easy and quick way to "check" the truth about power on car amp (Most other amps to) Is to check the fuse if it is lets say 15 amp fuse, on 12V system, and they claim 300 - 400W you know it is impossible coz 15A X 12V = 180W So if the amp in a peek draw more than 180W the fuse gona blow ;) But when driving, many cars have 14,2 V But still 15A X 14,2V = 213W (P(W) = I(A) × V(V)) That means that the nominell effekt probably is closer top 80W and no way it can draw 300-400W And do remember some of the power it takes through the fuse also goes to heat and resistances. Not all energy goes to the woofer. Now ofc this is not 100% accurate, It also depend on the voltage to the woofer. But converting will also "steel" power sry for my bad english

Subbed for the level of detail this video provides. Well done!

@Qualitymobilevideo

6 жыл бұрын

Thanks!

Definitely enjoyed the vid, made me subscribe. Way to go testing all the parameters. Most channels I've seen just throw equipment on a dd1 and call it a day. Keep it up.

@Qualitymobilevideo

6 жыл бұрын

Thanks Chase!

@chaseforrester1133

6 жыл бұрын

You're welcome, but you're the one's that did the great job putting it in Laman terms for the novices. So, thank you.

@chaseforrester1133

6 жыл бұрын

Wish I would've had videos like this one when I started out.

@Qualitymobilevideo

6 жыл бұрын

That's what we're here for!

you covered many different angles ,thats how its supposed to be ......well Done ✅

@Qualitymobilevideo

6 жыл бұрын

Thanks!

Wouldn't the "amp" perform better at 14.5 ( charging volt of a car) then a standalone battery dropping below 12V ? Not saying massive improvements, but 2.5v is a big deal.

Will adding a stronger amp to this sub be sufficient for a budget set up that is decent? The box looks good and the sub can handle more power . Currently running this active sub in a hatch btw.

Measuring the volume with plastic Airsoft BBs would be better than packing peanuts, because the plastic BBs are uniformly-sized and non-compressible. Sand would be even better because the grains are smaller and can pack more tightly, but I can understand not wanting to deal with the mess.

@Qualitymobilevideo

6 жыл бұрын

I totally get your points, lol but we ain't putting sand in that thing

Just Super ! I am so glad you pulled their pants down ! Thank you !

You can do 150db with a single 8....a 153 sealed on dash with a single 8 has been done years ago.

@elwood98034

6 жыл бұрын

I once ran two 8" as headphones using a $40 Boss 1000W amp. The clipping made my head melt.

@chaseforrester1133

6 жыл бұрын

elwood98034 are you from elwood KS by chance?

Nice to see someone actually test these things with proper measuring devices... but... I question your choice of signal generator, get a real one, or even build one. Sine wave generators are cheap and simple to make or buy, and then you get nice granular volume control instead of the digital stepped volume crap coming out of your iCrap device.

@Qualitymobilevideo

6 жыл бұрын

+idiolore we purchased a function generator, it will make its debut shortly!

@gnif

6 жыл бұрын

Awesome, looking forward to it :)

Dual and Boss...champions of the burger king budget car audio builds

I know it's janky shit, I was an installer for quite some time. That said, it's honestly not that bad looking aesthetically. Nice use of textures and the orange is a nice burnt orange and not that blaze orange F&F garbage. It's a cool breakdown though, very thorough. My car has 6.5" subwoofers tuned to 30hz currently lol, I can't imagine ever tuning a enclosure that high, especially a driver that large. Must be a one note wonder.

This was great! Glad I came across this channel. Subscribed.

@Qualitymobilevideo

7 жыл бұрын

Awesome!

i created a portable recycled bluetooth speaker (supposely 100w max) and i was wondering are all speakers cheaps? the problem with mine is under heavy bass loads the speakers basically sounds distorted.

this is why I build my own subs. I pick the driver, I make the baltic birch box, and I pick the amp... and none of it is junk.

This was an awesome video Lorenzo. Thanks

well done , ill be showing this to customers that bring in budget equipment

@Qualitymobilevideo

7 жыл бұрын

Awesome! Great idea.

Have you tested an under seat amp and driver set? And what do you think of them for money and quality?

It's correct, But they do like most manufacturers do. RMS but they don't tell you under what conditions it can reach said RMS.

Pretty impressive for $100.

@Qualitymobilevideo

6 жыл бұрын

Quick and easy for some boom boom

i like the detailed information, this guy is very educated

if i have 2 woofers in one enclosure should i devide the inclosure up or could i reverse the power to the other woofer and keep a closed enclosure. i'm not after loudest volume but after the least amount of distortion

I don't really see the "issue" with the "bumped output." That's called an acoustic impedance modification and is standard practice when designing sub-woofer enclosures. In professional sound reinforcement, they have "huge bumps" in their simulated response, often 20dB or greater above the characteristic sensitivity of the "naked" driver. This is accomplished with sophisticated labyrinths of folded up bass horns. The resulting "simulated" output would not look pretty on paper, but that doesn't matter because linear distortion from the room is just as bad or worse anyway, and can be corrected with EQ/processing, so who cares? The important thing is maximum acoustic displacement with acceptably low nonlinear (harmonic etc) distortion while minimizing amplification requirements. These horn sub designs have multiple impedance peaks, which is desirable as that further improves overall system efficiency, reducing amplifier heating. The engineers who designed this cheapo little "dual" sub took advantage of a cheap/easy acoustic impedance "trick" involving a driver with a weak motor and a ported enclosure. The in-car response shows that their "trick" combined with whatever EQ may be developed into the amp, work fine and deliver a very reasonably flat in-car response. (+/-6dB is outstanding for low frequency response). The location of the impedance "peak" created by the venting may well all play into the design in a more sophisticated manner than one may think on first impression.. That impedance "peak" may well be playing an intended role in reducing amplifier load through the most heavily used frequency ranges. As for the amp.. the 100W claims may be a bit optimistic, or... there may be another "trick" going on here. 20 years ago a similarly "cheap" system would have likely barely have managed 10W before significant distortion. In a way, we should be thankful for such a cheap device actually delivering power in the ballpark of claims (within about 2dB). I think it would be interesting to see what the amp would do when connected to 2ohm and 8 ohm dummy loads. I suspect the "100W" rating would come close to true at "normal" voltage input ranges with a 2 ohm load. There's no "requirement" that the amplifiers rating/claimed output be into a load that matches that of the driver it is paired with in such a system, so this "claim" may not be entirely bogus, just highly misleading. Not saying this "dual" sub is good or bad, (I do not care, and I'm not here to defend it), just pointing out that the approach to evaluating it here may be based in some false pretenses.

So.. if im not mistaken dB works as an logarithmic scale, for every 10db the sound level goes up tenfold, so dosnt that mean to get that 10db bump you need to add 10x power to the sub. Makes you wonder when they make such an huge mistake what else is wrong.

And to be correct with everything: An extra of 10dB means 10x the power according to physics: P = 10 ^ (L / 10) And in the other direction: L = 10 * LOG10(P) Or easier: Every +3dB means double the power. 0dB - 1W +3dB - 2W +6dB - 4W +9dB - 8W ...and so on

Great vid - Subscribed!! I do have a question about your method though... When installed in a vehicle, and hooked to the electrical system, the amp is getting more than 12v from the alternator, and I noticed a lot of voltage drop from the stand alone battery. That being said, I think it might have eeked another 5w, if that, but it would have been fairer. Either way Im excited to see how you boost this amp for the cheap!!!

Nicely done.