Audi A3 and aftermarket headunit

Tazzimus

Posted this over on audisport but haven't heard anything back so said I'd ask a slightly more active forum hoping I can get an answer.
Anyway, copypasta below:

So, trying to sort a better headunit in the A3 than the ****ty JVC one that was in it when I got it.
Managed to get my Sony one working eventually after much arsing about with the wiring loom from halfords.
However, only one front speaker works.

I had sent the below pic to the lads in caraudiodirect and they sent me THIS adapter, as you can see though, it has one more plug than I have.

Also, I checked in the boot and there's no amp or sub.
The fella before me had fitted 6x9's to the parcel shelf and butchered the old radio's harness to wire them in. Would it be possible that he disconnected the original wiring to the stock rear speakers or are they not working because the sub and amp are missing?

Also, from my pic, is that a non Bose or Bose set up?

TherapyBoy

If there are no other plugs than the two shown in the photo then it's not a Bose amplified or part-amplified system.

The brown coloured plug is your speaker plug, and it looks like it's only wired originally for front speakers. My guess would be the car was only fitted (& wired) with 2 front speakers when it was new, you may have space in the rear for speakers but I'd say that there's nothing actually behind the grille.

When you were using the JVC headunit were both front speakers working?

Tazzimus

Interesting.. I may pull it apart to see when I'm off next week so.

Drivers one was working sometimes, to be honest I didn't actually notice it until it started working one day and the sound got much better, the passenger one was doing a decent job on it's own.

TherapyBoy

Ok, so your drivers side speaker may be on the way out or it might be shorting somewhere. Remove the speaker and make sure the wiring & terminals on the speaker are ok. Try turning the radio on while the speaker is removed but still wired. If it works properly & is not cutting in & out your speaker cable might be just touching the metal of the car body somewhere.

About the back speakers, don't pull anything apart. Get a torch and shine it through the speaker grille. You should be able to see a speaker if you have one. If there are holes left by the 6x9's just buy a set & wire them up instead.

Tazzimus

Yeh I figured the drivers side one was either gone or is going.

6x9's are still in the parcel shelf but are hella chav so would prefer them not to be there. Plus the parcel shelf won't lift with them in it, which is a bit annoying.

I''ll see if there's anything showing when I shine the torch through later on.

Zascar

I have a TT with the Bose system. I changed the head unit and it was a pain, had to get several special adaptors which barely fit as there is no space in the back. However the rear speakers do not work. I need to get it sorted. There is an amp but its totally hidden. I got all the advice I needed on the TT forums, maybe you could try Audi forums and the guys can give you first hand advice?

Tazzimus

I had put this up on Audi-Sport initially but didn't get any replies, hence trying here.
Might have a look at another few Audi forums later after I check for back speakers like Therapyboy suggested