How to Wire an Aftermarket Stereo to a Factory Audi Amplifier

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Hey Guys!
Today I am showing you how I like to wire up aftermarket stress to factory Audi amplifiers.
They can come in 4 different configurations; 2ch, 4ch, 2ch + sub & 4ch + sub.
This method works for all of them but makes the most difference with the 2ch versions of the amplifier as this wiring method results in a very low difference in volume between the front and rear speakers when the fader is set to 0.
this is ideal because it means not much tuning is needed to get a nice balanced sound throughout the vehicle.
With this wiring method the factory subwoofer WILL still work.
This Audi is also set to get a Rockford Fosgate P300-12 active 12" subwoofer, and two sets of Rockford Fosgate P16-s 6" component speakers.
Check out that work here: • Its an Audi, I NEED MO...
Choose to be Happy & I will see you tomorrow.
Ka Kite Ano

[@derekrichardson8221]

GREAT VIDEO! Some of the old common ground systems I have been able to get away with connecting the after market stereo to just one speaker ground output and the speaker positive outputs to avoid rewiring the vehicles speakers or damaging the new radio

[@anicrow]

Cheers, was intalling a new Head Unit undoing the previous owners job, ran normal RCA preouts to my Bose harness (All of my car was amped) and fixed all the audio issues I was having. Would get loud static at high volumes out of my front tweeters. This video helped me confirm my thoughts and I wired up the new one first try sounding better than I thought they could.

[@davidprice8109]

THANK YOU I HAVE THE 2005 AUDI A4 3.0 THIS HELPED A LOT. ESPECIALLY WITH THE ANTENNAE WIRE. YOU NEED THE PINTAIL BLUE ANTENNAE SETUP. THAT BLUE WIRE GOES TO THICK WHITE (+) FROM THE STOCK WIRE HARNESS. ALSO THANKS FOR TELLING ME TO GROUND BOTH SMALL BROWN WIRES,ONE IS ALARM GROUND, THE OTHER IS CALLED "BOSE". DONT HAVE THE LEFT/RIGHT CHANNEL SETUP BUT BOTH NEEDED TO BE GROUNDED. ALSO, NONE OF MY SPEAKER WIRES NEED TO BE GROUNDED EITHER DUE TO THE STOCK AMP ALREADY GROUNDING THEM. FOR SOME REASON I DID EVERYTHING YOU DID BESIDES THE CHANNELS AND NOW EVERYTHING WORKS. THANKS BUD

[@rccrawler-so1pf]

Well explained and worked a treat for me been trying to fix this problem for weeks

[@wogezaz]

Hi, just finished to wire after this tutorial. This was the most informative which I managed to find. My case was Pioneer stereo, and Audi a4 b6 2004 TDI 96kW with half (rear and sub) amplified speakers. Everything works perfect. Thank you for this valuable information.

[@andersskaar3035]

Hey! I have the same car as you. When i do as in the video i get a low buzzing sound from the rear speakers?

[@michalzwierz]

I have an Audi A4 2007 with amplified rear speakers and subwoofer. I was connecting an aftermarket android head unit. Thanks to your video I figured out how to make these connections with a quadlock harness. The only difference was that connecting negatives to the main ground caused a lot of noise at the back when the speedometer backlight was turned on. I reconnected these negatives to its previous position and everything works fine:). Thanks for this tutorial:).

[@Mecano.r]

Thanks for this great video. Nice job and excellent explanation. My aftermarket radio now work properly and the sound look better than before "only front speakers".

[@j.b.1526]

I know this video is a few years old. I purchased an A4 B6 and have upgraded the headunit to a single din JVC-X270BT and was able to wire it up using the RCA jacks and cables supplied with the adaptor harness. At first the rear speakers and sub wouldn't work but as I fumbled through the endless settings on the radio I came to the preout settings. Went through them and then adjusted the gain now it works. If I were not able to get it going my next step was to do as done in this video.

[@steinarnie]

Good informational video. Looking forward to the new GoPro

[@Mrk1rby]

This worked a treat! Thank you 👍

[@foureyes5498]

Wow you’re my audio god. I had it set up the same way but with the negatives connected and it led to a static sound. Now reversed it to your method and bam! I can hear the sub knocking now and no distortion. Thanks man!

[@sandeeprajmoenilal5836]

Hello, could you please let me know how you got this working in the A3 cuz i am not getting it to work as i burned my aftermarket radio by just trying to get it to play.

[@timsteintjes4524]

Hey, could you send me a drawn wiring diagram by color. I cant gwt it to work

[@luckgrip252]

Watched it first time, didn't understand the wiring. Looked at my wiring loom, gathered some thoughts, then this video makes sense and will try out your method soon!

[@jezbrown2666]

Thanks for this. My 2007 S4 had me beaten until I watched this video 👊

[@2nsane2005]

how? they make plug and plug harnesses

[@groksplitta9211]

i can verify that this works, sounds great too, thankyou so much for making the video, I would not have got this myself.

[@ChrisS57171]

Very well said. Totally understood everything you explained. Thanks for fix :)

[@niknikki5029]

worked very well thankyou

[@Mary93482]

GREAT, Thanks you, Yuore video helped alot, with love from russia

[@DaCleana]

Absolute legend! Couldn't have done it without this guide 🙏🙏

[@draconova83]

Just perfect thank you !

[@zanskorolovs2401]

Nice one man

[@timoteuseberhard1717]

I stumbled on this video from previous year and it saved me some dollars. Thank you

[@ScootieXP]

After so many years your video still managed to give me some useful informations. Recently aquired an Aycetry/Wondefoo HU PX6 model that is missing an AMP CON wire that so many other HU's have. Regarding that, have a question for you if I may. Am I correct that you connected the rear amp/white wire to the 12V blue wire of the radio antena to power it? Images are not clear in that part of the video. Thanks in advance.

[@nelfurdui]

What about white and grey wires from front? could't understand a thing about these. Thanks in advance for an answer. And how did you wire the power so stereo start when you start the ignition on?

[@mattp101]

Fantastic! Works a treat on a 2002 A3 (8L), no bose, amplified rears/sub. Thanks!

[@sandeeprajmoenilal5836]

Hello, could you please let me know how you got this working in the A3 cuz i am not getting it to work as i burned my aftermarket radio by just trying to get it to play.

[@florentkahal1697]

Hello could you make a schema for the connection of the 4 wires of the pod 20 pine to get the sound back because I dry

[@andre-louislevesque9529]

Excellent !!!

[@MATTYNINEGRAND]

Thankyou so much, Xtrons engineers solution was to use an xtrons extra speaker adapter kit, when i asked if they could link me to it they linked me to a reel of speaker cable lol. I knew it could be done somehow so thankyou very much, will be doing this tomorrow 🙂

[@MATTYNINEGRAND]

Worked a treat, sounds lovely. I also bought the aerial adapter thats in your video and connected it up the same but the reception is really poor, Im guessing you didnt attach the original coax aerial connector to anything? you just fitted the original audi fakra connector to the cable in your video? Wouldnt there be a wire on one of the original ISO plugs to power the built in aerial amp or is the blue one on the aerial adapter cable thats in your video enough? Cheers

[@lilblue101]

I have a 2007 Audi A4 3.2 Quattro with the navigation plus Bose audio system and I'm trying to put an after-market Pioneer double DIN CD DVD player in it which harness do I need for my application

[@Norby15o]

OT question, where can I get a vent with the gauge on it? THANKS!

[@MelvinDlaCruz]

Hey can you do a video explained all this but for a Audi A4 avant b8, step by step please, I go el sub and 2 new speaker but I am scary how instal all in special the cables

[@tyler-et8qn]

I used to have this same car and what I did was unplug the rear amp and just use a couple short runs of wire to connect the rear speaker amp input wires to the rear speaker output wires essentially using the stock harnesses to have everything minus the sub to the aftermarket deck like a normal set up. Then i just used an aftermarket amp and sub ran off my rca outs. I wish i coulda tried this trick out though to see if it gave you more overall power to still use the factory amp to cover the rears. But I no longer have the car.

[@BollasGeorge]

Do you have feedback on the central audi console for e.x when you play a radio station as you had with audi stock radio or is it blank. I have an after market multimedia which has a return feedback wire for that reason but in the central display infront of the steering doesnt display anything

[@kylewinstonpillay4165]

Could you please tell me how to hook up the steering controls and radio antenna

[@johnhamilton241]

The most helpful video/instructions on the internet! Top class thanks man!

[@ryanmccann4160]

Would this be the same on the seat exeo 2010

[@SergiMorant]

I spent a whole day trying to figure out how to make this work, if it wasn't for your help I would've never managed to use my factory rear speakers on my A3. I didn't get my windshield speaker to work sadly. Anyway much obliged for the help.

[@aquilameranese]

lol I a dealing with the opposite. only windshield front working and no other speaker working :(

[@jamesporter2708]

Will this work on the 2004 A3?? 3dr model

[@jontaylor974]

This is great, I've just done the same to a 1999 s4 with a 4 Chanel factory amp. I was having issues where the factory subs wouldn't power up & all sorts of fader & earth complications. I have one question, I have 4 wires to a brown plug that would have gone to the LH front +& - NON pre out speaker terminals, is this for a centre front speaker???

[@ankomen]

yo how did you get your sub to work ? my car is a6 c5

[@Nielutz]

Hi , where is the radio antenna amplifier situated in a audi a4 b7 sedan? Didnt quite find it and the radio signal is as bad with cables as without them put in

[@Bobolicx]

Can you give us some diagrams? how exactly did you wire the aftermarket radio with the audi wires? thanks a lot!

[@premierleague_itk2626]

Match wire colours

[@joshbrowning3488]

I'd love to know what color each harness wire goes to on the factory harness.

[@bennollan5578]

Yes plz

[@xavierortiz4399]

I'm late to this video, but I really need to know what wires go where, I tried looking at diagrams and nothing looks the same as mine, but yours do, I don't know what speaker wires are what

[@benjamindyson226]

Does the factory rear subwoofer have it's own amp?

[@NiumeLTU]

Hello any ideas why could rear passenger speakers barely play any sound?

[@irishRocker1]

Ah I see. I had exactly that problem. Installed a Sony radio using a an adaptor harness for front speakers etc and rca outputs to the rear. So as you said front powered by radio, back speakers and sub powered by audi amp. I found the rear very low and basically because the sub was not balanced, the overall sound was thin and lacked balls.

[@dewaynejay1032]

Hi i'm in the US is it possible to wire a aftermarket radio to a 06 Audi A6? I haven't had any luck at all brother!

[@2nsane2005]

I like your videos brother but I really don't get why you didn't use a simple plug and play harness. I just installed a double din Kenwood deck in my 2004 Audi S4 and was so simple! hooked up 4 wires in total and connected 2 sets of RCA's (I have Bose)

[@zanskorolovs2401]

Good man yourself

[@IceWolf1991]

hey mate... thanks for the heads up, but i got a little problem after doing this ... how can i write you in private ... maybe you can give me an idea

[@troykochenower6099]

Does this bypass the factory amp? What if the factory amp is blown?

[@johnathanvanloggerenberg5373]

I'm sure my A3 8p has amplified rear speakers but there's no Amp in tge rear right hand side of the car. It has a comfort control module in its place

[@jurelesek8596]

Can i get some.kind of a close up photo ? 😃 i would be very happy about that i have an aftermarket HU to install in A4 B5 2000 :)

[@sergiomorales9655]

What color are the front speakers and what color are the rears I can’t seem to figure it out

[@robertlouiscoman3308]

A Quick one ! On Audi A3 8p 2005 I rid off the aftermarket 2din sat nav and I want to fit the genuine 2din stereo chorus but is not turning on :( what can I do ??

[@vickramchandi3789]

Is this works I will love you so much 😆

[@AliG.G]

i have an audi a3 2011 I cannot find an amplifier in the boot (UK)

[@lariworld1966]

And you help me I have all same like you but I don't know what you make. All is same but can I make this frome radio cable to make frome that way to this whit blue and what I make with the speckers must I make this with the front or seperat but where are the cabel in the car of the specker behind and Bass box

[@faffbmx]

Great vid. I’ve just put my pioneer pop out screen in my a4 and sounds great. One thing tho, when the screen is out there is a humming noise. What can I do?

[@glovercarvalho1930]

Exactly same problem here, it's a quiet hiss but definitely audible and can get annoying

[@faffbmx]

It’s only on the rear amped ones at low level. Maybe needs another earth?

[@glovercarvalho1930]

@@faffbmx I've found another and better solution. It's a low line converter. Type on AliExpress "Low line converter" and it's the first result. Connect the rear amped output of the HU to the low line converter and then to the speakers (rear amp). Then you can adjust the two little knobs on the converter and make it a perfect 50/50 sound with top notch quality and 0 distortion.

[@faffbmx]

@glover carvalho so your using the rca outputs on the HU into that low line converter then to the speaker wires?

[@glovercarvalho1930]

@@faffbmx Not the RCA outputs, I'm using the already amplified output from the HU

[@exposethetruth1572]

Where do u guys base?

[@user-sh5nf9zj8m]

Sir my market radio is got two shebowa one is for power supply other one is for speakers connection

[@nickplaisance4991]

I see you don't really answer but ill ask anyway,can you finish naming to plugs and where they go on amp pinout..

[@dewaynejay1032]

Hey bro where's the remote wiring for the factory amplifier in a 06 audi A6? I'm having so much issues trying to find one. If you can kindly help me man I will most definitely appreciate it.

[@benjamingibson8795]

Blue wire from your aftermarket radio is usually the one.

[@Mr3nrico.]

Where do the white... Black and white.... Gray... Gray and black hook up to?

[@user-sh5nf9zj8m]

Morning sir can u please show the connection colors match because some where some where I can get it well please help me the front speakers are fine but the rear ones Is the problem please help

[@clonSanG]

I’ve got a jdm Audi A3 2009 and I can’t get a head unit to fit it because the Japanese stereo has all sorts mad cable coming out of it

[@johnbang66]

i have A4 B6 2001 with Bose and sub. . and i don't have this brown connect for speakers. How to connect this to a new car stereo. How to connect this.

[@nogamessheep2046]

Will this work for a 1999 Audi A4?

[@wotsdadeal]

Can we bypass the amp?

[@dovydaszaveckas254]

Can you help? I can't find the ACC( or switched positive) for the headunit

[@86XFA]

For Audi, you have to wire in your own switched live

[@ellalillyhearn8800]

So how to wire the power side as my Audi only has red with white stripe and brown witch is a 320v looking wire lol

[@diodimov]

Hey dude, I wired it up like yourself however I'm getting a lot of engine noise. How would you fix it? Thanks

[@theldeadshot162]

Did you run the amp into the speakers or the turbo.

[@cryptocarscomputers2327]

I need help please guys I have a slightly different plug so I'm a little confused my quadlock has the 2 standard iso plugs but my amp/extra is on 2 smaller plugs one green one blue....

[@Sillukas666]

Thanks very helpfull.

[@BallOut357]

what about 05 audi a6 qauttro how to replace head unit ? how to replace the speakers with aftermarket?

[@HoLDoN4Sec]

BallOuTT you cant lol, that a6 is the one with built in Audi MMI2.5, if you want to replace it you're gonna have to spend quite a bunch... (I know because i have a 2009 A6 and have done the research) Its not impossible, but its just too expensive to justify doing it (you require three different aftermarket conversion kits and thats before you even buy a head unit lol)

[@BallOut357]

HoLDoN4Sec this guy install Aftermarket radio in glove department kzbin.info/www/bejne/rmevlJqPbMihlZY

[@HoLDoN4Sec]

thats on a Q7 though, on the A6 it wouldn't work, you simply don't have the space to install even a single din aftermarket radio anywhere in the cabin without either getting rid of your AC controls or getting rid of your addons control panel. the only way would maybe be completely overhauling the entire car's audio system and installing an android unit with a canbus adapter and video out to the original MMI monitor to enable the use of the original MMI controls on the original stereo screen. from what i'm aware of, there is actually a place that does this sort of conversion but the price makes the entire deal not worth it (its over approx. 5,000$US)

[@BallOut357]

@@HoLDoN4Sec what about mirror link to head unit?

[@mohammedfaridbellamine4055]

Please help me and answer me, i have audi a4 2013 restyling one b8,5 , and i had audi chorus, then i upgrade to audi concert with chinese aftermarket android 10,25 inch screen, so i see that max volume is not so high than before, were is the problem coming for? Is it the android screen? Or the audi concert is not connect well to my car? Pleaaase answer me

[@mohammedfaridbellamine4055]

What can i do? Please help me

[@likeclockwork6473]

So basically you need an audio ground for the factory amp? Doing something real similar to my Highlander with a factory JBL amp. Was going to bypass it originally but they said the factory speakers are balanced with the factory amplifier so go with a loc between the new head unit and the factory amp. Don't know if he was bsing because that's the easiest way to add an aftermarket head unit (without bypassing the amp entirely) and they can sell me an loc. Apparently you did it without an loc and used an audio ground. A lot of people using the two harnesses I bought were complaining about the amp not outputting audio going directly from the speaker level output from the aftermarket head unit to the factory amp. If it needs an audio ground that might explain why. On the loc I bought it said for going from a new radio to a factory amp you were basically going from a audio level in to audio level out which made no sense to me because then going the head unit to the amp shouldn't have any issues. If it needs an audio ground that would explain it. So I'm assuming the factory amp wants a higher level input not rca. Do head unit rca's already have an audio ground? I guess I'll find out lol

[@ankomen]

My subwoofer is not workin with this kind of wiring :/ Any help or a solution ? Can my rear left and right channels be reversed and cousing my sub to not work ?

[@diodimov]

Same here

[@diodimov]

Were u able to fix it?

[@ankomen]

Yes. You gotta have a good ground and that blue wire to 12v to start the sub.

[@ionutzuluffy6171]

How can I connect the rear to 12 channel plug

[@clausweb3984]

I think u connect it to the white wire from the Audi harness but pictures are not clear in that part. If I understood corectly, you conect the amp to the 12V radio power.

[@stbazz]

Thanks alot haha this video helped me :) 2019

[@tommyamundsen86]

Why dont you use a plug&play harness? CT51AU02

[@davidhrules]

I have that and its not letting the new unit power up, any clue on that ?

[@2nsane2005]

@@davidhrules Did ya run switched power to it? Like it says to

[@PeterFeltersnatch852]

@@2nsane2005 usually the red wire is for switched when I connect staying powered on and not turning off with the car? Which wire is a switch wire on the factory Audi harness? Thank you in advance

[@2nsane2005]

@@PeterFeltersnatch852 I used a plug and play harness to connect my aftermarket deck. I ran a wire to the fuse box and tapped fuse #36-30 amp fuse. Its specific for my 2004 Audi S4 with bose

[@2nsane2005]

@@PeterFeltersnatch852 Harness I used is the Metra 70-1787

[@GloriousReign]

Adapter harness

[@samaliasyo2462]

BRO I can’t get the color diagram for this radio man wtf is all the wires pos/ground 12v illum acc12 etc hellllllp

[@AliG.G]

where do i find my car's amplifier?

[@MZLALA19]

Ali G check trunk side move cover

[@user-sh5nf9zj8m]

Is for audi a6 quettro 2.8 radio

[@pauliusgilys5472]

Radio Green goes to-amp Green Radio Black goes to- amp doubles browns +main audi thick brown (from black conector). Radio blue whit white stripe goes to- amp white. Not really easy explain But meabea helps little

[@theldeadshot162]

Hey bro I've googled the shit out of this and found nothing, if you could point me the right way I'd be happy as. I just bought a used 2008 A4 S Line B7 Avant Wagon. I'm not sure if it came factory, but the head unit is an RNS-E MMI. 6 CD changer 10 speakers factory amp NO AUX NO BT NO IPOD The only working speakers are the front driver and passenger. The rear doors do nothing. And the rear speaker (6" sub?) located under the amp in the wagon, puts out a very distorted crunch on every bass kick. We're under lockdown so I can't take it to anyone to look at. Can you tell me where to start? Fuses, connections, loose wires etc. Any resources would be appreciated too. Also I don't have any head unit keys to pull the deck out safely and without damage so, until I get some I can't get behind the head unit. ​​​​​​​Cheers.

[@tylerhlynosky3422]

Did you ever figure this out

[@shugkidd7578]

I've done this and my amp only.works when the radio is on. Dosent work on any other functions and pops when I turn it off can any 1 help?

[@clausweb3984]

I think that's the way it's supposed to work while using an aftermarket HU.

[@Buzz_memes__]

video traductor porfavor

[@rafaelrodriguez3880]

You could have brought the harness instead of cutting the factory harness on the car

[@jeremyremington8897]

So I am not a stereo guy by any means but geeze it blows my mind how many videos are all about tapping into the old stupid factory amps.. so annoying as Im juat trying to hook up door speakers for now n ad real speakers and amps later but not sure what colors i need or do i hust need rip it all out n start fresh ?

[@essjee6956]

Your negative connections doesn’t work on my a4

[@tahmeed1202]

Techmoan

[@yellward8311]

I'm not watching this they cant even install the steering wheel in the right place lol

[@IboTamDeli]

My car was differend but i figured out dont even remember how i have done it 😂

[@l33th3tr331]

I've just done this, and I'm getting a speaker pop from the rears when I turn the car off, any ideas?

[@Mecano.r]

I've just done this today and i got that pop from the rears. I think it's coming from my bad ground on the rears ones. Mean giving them only positive. Tomorrow i will try to ground them. I will keep you updated or if you already find the solution please share.

[@rogersocalbeaches5734]

I am getting the same pop when turn the car on/off and when I turn volume to zero or mute. I ordered a Hi-Lo Box and/or Ground loop isolator. I removed the stock Bose radio and replaced it with a Android touch screen and connected that to the Stock Amp. This radio came with a can bus wiring harness that may be wired similarly, but I don't think the center speaker on the dash is working. I have no idea how to connect the Hi-Lo or ground loop Isolator. I don't know if its a 2 Channel or 4 Channel Amp. I hope it works.