Install Amp And Subwoofer 99 Audi A4 Concert Headunit

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Hi All, I have an Audi A4 B7 2005, with a standard Audi Concert head unit part no (8E0035186D) Currently the system is half amplified (rear speakers and standard sub.

I have gone fully aftermarket in mine and dont use any of the OEM stuff. HU changed, all door speakers changed (fronts amped, rears from new HU), centre speaker in dash disconnected, OEM sub and amp ripped out replaced with amp and 12' sub in boot. You are right that you need to find an ignition live if you want your HU to come on with the ignition. Mine is wired so that both the live and ignition live for the HU go to the permanent live on the car HU loom so the HU can be on without the ignition. I did however need to find an ignition live from the fuse box for my Parrot hands free kit. The other wire I needed was an illumination signal wire to dim the HU when the car lights are on.

This was sourced from the back of the headlight switch. As for using the standard sub I'm not sure how this would be linked into the new HU as I have a vague feeling you will find the sub (and maybe the rear door speakers) wont come on if you just link into the car loom with your new HU ISO connectors. J7USS may be able to help as I think he may have done this. I definitely can't put new subs in the boot as I use every inch of the space regularly. I have the facia adapter already but never got around to choosing a head unit. I'm thinking if the new head unit has pre outs I could stash a small amp somewhere in the back to run the speakers and leave the existing wiring to power the oem sub, which is much better since I replaced the spaker in it. A plastic sub box will always sound like a plastic sub box but I can look at custom making something different later.

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  1. AudiWorld Tech articles are arranged by model with the newest articles. Subwoofer Installation ('97 A4 with Delta. ('98 models with Audi Concert Radio/head unit).
  2. AudiWorld Tech articles are arranged by model with the newest articles. Subwoofer Installation ('97 A4 with Delta. ('98 models with Audi Concert Radio/head unit).