Installing AMP and Subs in an A4 cabriolet with bose sound system
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RE: Installing AMP and Subs in an A4 cabriolet with bos... - 4/25/2008 8:12:46 PM
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djgeojoe
Posts: 25
Joined: 4/8/2008
Status: offline
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OK, I got the power wire through the firewall with no problem. There is a grommet just to the left of the battery, perfect fit! I had to remove some of the foam that is attached under the floor carpet along the door jam trim to make room for the power wire. I then ran it into the trunk, there is a double wall going into the trunk but when you remove the passenger side trunk panel I found a great hidden wire way. The power wire runs close to the rear air bag control module wiring, hope this is not going to be a problem. Here I go, down the road thump thump thump..BANG!! rear air bag goes off from the power cable electromagnetic interference LOL! Lets hope not! I put the bass knob in the glove box and ran the RJ11 cable along with the power cable (don't worry the RJ11 is twisted pair and will not be affected by common mode interference). Tomorrow I will tap the bose amp for the line level outputs and remote power (Yes my bose amp has a remote turn on and is not turned on by the can buss WOOT! Lets hope the line level outputs very with volume and are not fixed using the can buss to adjust volume). I may have to use a DC isolation transformer for the RCAs if there is a ground loop. I don't care about loosing some high frequencies through the 1:1 DC isolation filter because I only need ~20-200Hz.
I found the source of the farting noise coming from the trunk. there is an external to internal breather port behind the trim panel (low and near the rear bumper just above the exhaust). There are rubber flaps and several ports in one big port. I think this is for air flow to cool the bose amp when the car is moving. I could remove the rubber flaps but that could let in water, not to sure what I can do about that, I bet there is another one behind the driver side trim. I could seal it but the bose amp may over heat. I think I am going to remove it and put a plastic kitchen sink scrubber mat over the holes (its like plastic brillow sp? matting). That will still let in air and block water but will not vibrate and make noise, it may make a swooshing sound like a shallow port but I could live with that. {edit} Could this be an exhaust port sucking air from the trunk vents to the rear of the vehicle and the rubber flaps are used to keep engine exhaust from back drafting into the trunk? If that's the case then I can not replace the flaps.
< Message edited by djgeojoe -- 4/25/2008 8:28:27 PM >
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2005 Audi A4 cabriolet 3.0L quattro
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Installing AMP and Subs in an A4 cabriolet with bose so... - 
