Thanks mate. Gonna put this in a "sticky" thread on some car audio forums. It'll save heaps of time trying to type out answers to the hundreds of people who comment or start a thread about having "alternator white" or other "Noise" in their system. 👍 It's also worth noting that in general, most budget or mid tier level amplifiers will have a common ground on the inputs and power supply, while most upper tier or premium amplifiers will have isolated or "differential" inputs, which function as "common mode rejection" inputs that are somewhat *similar* to a true "balanced" input...i.e. 3-conductor XLR or TRS on pro audio equipment.

@envisionelectronics

Жыл бұрын

It’s wrong. This amp doesn’t use a common ground input. Check the schematic.

Boom or bust vedio, Comings soon?

I did the janking thing in the old days over 20 years ago and nobody I talked too new this , but the ground loop isolator I used dropped the noise floor at least 10 db and I had to turn the gains up to get the same output this would have been very useful, is very useful 👍🏻👍🏻👍🏻

Bizarre because the Rockford should NOT have a common RCA ground. They used the TOPAZ system which was a quasi differential input and referenced to the secondary side of the transformer. Wonder if it’s been modified.

@v12alpine

Жыл бұрын

Yea I thought that was odd as well. I actually used one of rockford's really old schematics to design a differential input circuit for one of my projects.

@frankcatweazle3611

Жыл бұрын

That's strange! The PSU always separates the primary from the secondary side. Only the 80s Amps had no seperation. I don't know any amp which has a ground connection from the power ground to the RCAs nowadays. Maybe a high resistant. The ground should always come over the RCA cables from the headunit. That's also the reason, why barevids scope signals look so noisy. He has grounded his scope to power gnd and has a bad connection to signal gnd. Here, it would make sense to connect both grounds together.

@envisionelectronics

Жыл бұрын

I just checked the schematic and yes - the RCA ground as well as the entire preamp stage is connected to “I GND” which is NOT tied to Chassis GND. Sorry to say this problem was not repaired correctly.

Really interesting, simple explanation; love it!

Lots of times the ground wraps on the head unit are on Pioneer units which run pico fuses on the RCAs. People will plug and unplug the RCAs under power and it will pop those fuses. Enter the ground wrap.

Thank you for this. I knew the Rockford amp was my problem!!!!

I remember back in the early 80s some factory gm trucks came with ground isolators on factory head units, they do seem janky but them things get the job done in a big way, especially with brush 1 wire alternators, those things make noise like Chewbacca...😂

oh my goodness, I have 2 soundstreams & a rockford amp in my van, i think you just fixed my alternator whine...

Solid video!

omg so much good information Thank you

i had the same issue BUT with 2 volt HU.. I set my HU up to 20 for max volume but at 20 has only 0,7volt on rca so i set gain amplifier up as a result a lot of noise.. so i put my HU at 50 for max clean signal 1,6 volt and turned down amp gain after that sound was clean... im speaking for mids and tweeters.... so if u want quality buy 4-5v HUs

Hi. love all of your content. I have engine noise coming through my Taramps bass 8k. When I unplug the rca jack the noise stops. I was thinking about using a dc to dc power supply with a microprocessor to power my Kenwood head unit. To isolate the alternator noise. What do you think

The isolator is the cheapest and most effective

I’m wondering if this is the issue I’m having. I think I may have loosened one of the rca cables on the back of my head unit maybe? It makes the alternator whine as I increase in rpm, my last amp which was a Jensen xda94rb, didn’t make the noise, but I installed an XPR540 and re did my entire ground wire and power wire setup from the battery with a new inline fuse and when I hooked it all up to go it made the alternator whine which increased with rpm. My solutions currently were option 3 which I plan to try or to re do my ground all together, maybe even just check the back of my head unit and just make sure my rca’s aren’t loose?

I've been getting this when I use my 2nd/strapped vibe blackdeath bass1 System has zero noise but when that even gets the RCA plugged into, the noise floor becomes horrendous 😢 Alpine CDE-295 HU Alpine RA-90S Vibe deltabox going to 1-2(strapped) blackdeath bass1

Hi @barevids I have a Question because you have flex Videos from the DD Audio Lineup. Was buying the DD Audio Redline 812 D1 (dual 1 Ohm) Subwoofer used, but in pristine Condition from a guy here in Germany. Couldnt find the needed Specs for Winisd Programm. Was contacting customer support from DD Audio, but no Answer since 2 Weeks. Can you or someone in the Community help me out with the Specs for Winisd? Greetings from Germany Edit: Forgot something. The Sub is the non stitched Version with 1000/2000W RMS 6000W Max

One of my customers try to connect the system on its own and RCA were cheap and touching the positive wire and it was causing static noise.. but oh well he said i charge a little too much and some knowledge is the difference..

Just be aware that ground filters can and do suffer from impact damage I believe as I found a few that have floated around many boxes over the years and well not worked as they should.

I have a whine but it come through the sub. I have a lc2i pro for line output converter and a atg 2400 watt class d. I get a whine when no rcas are plugged in. What's my problem????? Changed ground locations twice

What are CMRR balanced inputs? On amps with only RCA inputs

Hey Sam, I don't know if you will get to this, but I will thank you in advance if you do. I have an MB Quart formula FA1900.5. I'm pretty sure the power supply mofsets blew, I'm pretty sure the amp got too hot. But anyway, where do you get the parts to fix it? I've been all over Google, and I can't seem to come across the site that sells that stuff. The number on the MOSFETs is 80N08A. And I've googled them a hundred times and I can't seem to find those things anywhere. If you can help, that's awesome. And if you can't, I get it. I still watch your channel, still enjoy you repair an amps. You got a great channel brother.

Hey I was really hoping you could help me out real quick. My 4ch amp was running strong but just decided to give out. It started making a speaker popping noise every 3 seconds but now it just sits in protect mode and makes scratching noises and the occasional pop. What's going on with that? Also, I've been watching your vids trying to fix my amp. Appreciate the content, cheers Edit: Nvm, found a shorted fet lol, guess I can start there

Literally have the same issue, Rockford sub amp newer Rockford 4 channel.

@brutalbasspro

Жыл бұрын

Update for me, I ran a ground loop isolator on my subwoofer amp. It’s fixed now you’re awesome dude!

Yep Isolator is the cheapest way I've Generally forgot about that problem it plagued a few builds back then

I really want more live streams!

Just looks like a reason to get out of amp repair, remote diagnostics (after spending much tooo much time), Keep up the good work, I live near you

@barevids

Жыл бұрын

Do you haha! Should hit me up, always looking for more likeminded pals locally

@envisionelectronics

Жыл бұрын

@@barevids please check the schematic. I think you’ve missed something. The RCA input is tied to I GND not Chassis….

@barevids

Жыл бұрын

@@envisionelectronics I never said Amp chassis, I said main ground that is also vehicle chassis ☺

I'm sorry, can you please elaborate what you mean by saying "have all your audio equipment floated on signal side ground". Our Honda Civic 2008 started releasing this very low volume, high frequency sound that increase as the gas pedal is pressed. When the stereo volume is fully off, the sound goes away. But, as soon as volume is put on 1 that sound comes back. The sound started with stock audio system and speakers. Maybe you can help? Thank you.

What about if the rca aren't connected and there is a whine but it doesn't go up with the rpm, just constant whining and then dissappears and comes back?

C12, C77, C80, D19 Perhaps one of these is shorted? (Assuming I have the correct schematic.)

More boom or bust?

Is this true of all rockfords? I have a T600-4 running alongside D4S JP amplifier? Haven't had alternator wine. Use stinger X1 rcas

@JasonWW2000

Жыл бұрын

No, of course not.

What about if the likely source is the eq I’m running? Would I then have to isolate all the rcas?

@barevids

7 ай бұрын

Stop using the eq, there's no need for it as we are not in 1995 any more 😁

Yep... The notorious ground loop. You can end up getting all kinds of hum and noise from everywhere. Most times, isolation is the best solution.

@theodoresignal

10 ай бұрын

Yes it does work in most cases, but it does reduce the signal potency.

I have a problem with the blue soundstream amp where there is alternator noise through one of the four channels when all RCA are unplugged, would these solutions help?

@barevids

9 ай бұрын

Sadly no

Could you just put the Rockford on its own ground?

Please help! I just bought a used jl 500 slash 1v2 and I have everything hooked up correctly. It won't power on. The only thing that it does is the thermal light flashes once and that's all. ?!?! Any ideas?

@barevids

Жыл бұрын

Sounds like you should go back to the seller for a refund

Wow Memories .. Any one still have the Alpine Car Audio Technical Book April 1990 ? Page 9 half way down "Ground Loop" Sold Many Isolators to the DYIR's Metra #E-4200 and if that doesn't Work Get a New Car .. LOL

I am very interested in seeing a video of how an amplifier knows that it is in bridged mode. What goes on inside of the circuit that allows for more power output using just two terminals. Please post something if you can.

@barevids

Жыл бұрын

I made a video some years ago about amplifier bridging, you can search barevids bridge. I also did another recently on fullbridge amps.

@JaredElliott1

Жыл бұрын

@@barevids thanks!

Can i send you my kicker zx 1500.1 bro?

You doing okay Sam? We haven't heard from you in a while.

I remember you saying this in one of your live streams!! I had a similar problem waaaaaay back in the day. Fixed when I swapped amps. Good to know why.

Just run your alternators output through a very inductor to trap the wild and loose AC.

Hey, I'm having an issue with my deaf bonce apocalypse 2900.1D. It gets power, but when turned on, it instantly starts flashing the clipping and protection lights. Is there an email address where I could send you a video of the internals? I think I found the issue, but I'm not sure if I can fix it by myself or if I could send it to you and pay for a repair of the piece.

@barevids

Жыл бұрын

Replace output fets, and driver if necessary

@djnaughtybass

Жыл бұрын

@barevids I took the bottom plate off, and I found a broken leg, not 100% on what the leg goes to or what's called, tho. I can send you a video of it because I'm pretty sure that's the issue.

@djnaughtybass

Жыл бұрын

@barevids yeah I'm pretty sure it's an output fet. Only 1 seems to be broken. But I don't have the tools or knowledge to replace it.

is 1500 watts at 2 ohm any louder than 1500 watts at 4 ohm? i get mixed reads on this buddy

@barevids

Жыл бұрын

No haha

Is this capadible of doing 8000.1 watts

@JasonWW2000

Жыл бұрын

Is what capable?

u good bro??? 🤔

1

Or you can use a eq

🙌 👌

I need some help/info, i wanna get windy on a single 12", abt 800wRMS rated.... power wise, i can get an amp to suit.. but i need help going about designing a box that till get windy... no wall off nothing.. just my trunk space, 26" depth,,16" hight, 36" width,, 6tf wavelength

@mikewhalen5049

7 ай бұрын

4 cubes gross tuned to 26hz 40sq" of Port area

@nicholasram8235

7 ай бұрын

@@mikewhalen5049 thank fuck you.. somone who actually gave me USEFUL INFO, rather than just ssying, big enclosure and tune low, you gave me values abddddd port area too❤️❤️

@mikewhalen5049

7 ай бұрын

Np man be sure to brace the baffle good 👍

@nicholasram8235

7 ай бұрын

@@mikewhalen5049 ofccc brotherr🤌🙏❤️