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   Audi A3 8L chassis ('96-03)

   Audi A3 8P Chassis (03+)


Love your A3/S3 but could do with a bit more bass? Don't want to lose any boot space but want the sounds to match the quality of the rest of your Audi? You need an AMSS stealth sub upgrade. The single biggest improvement you can perform to the sounds in your A3/S3.

Our custom AMSS subwoofer enclosures for the A3/S3 8P chassis Audi's are professionally manufactured to the highest standards. Composed of 18mm MDF, the replacement enclosure provides a rock solid sealed unit housing the phenomenal JL Audio 6W3v3-4 6.5" sub.  The enclosure replaces the stock OEM tupperware sub mounted in the rear passenger side cubbyhole in the boot, either Bose or non Bose. The stock sub is made from the finest cheapo plastic and is the basis for the lousy sound quality achieved with either the standard or upgraded Bose system in the A3/S3. Even the Bose system uses the same enclosure so precise punchy bass cannot be achieved whatever you try - until NOW!

AMSS 8P enclosure.jpg

The AMSS enclosure fits snugly in the same location, with the amp mounted behind the rear speaker panel providing a totally hidden stealth solution for all A3/S3 8P (current shape) Audi's apart from the SportBack. It does fit the SB but Audi thought it was money well spent to completely redesign the subwoofer in order to accomodate the puny indents at the top of the boot panel. The SB subwoofer has a scooped out front panel in order to fit, and there is not enough depth to do this to the stealth sub and still fit the JL sub. This means the boot panel now fouls on the stealth sub. In order to get it to fit the SB you have to push out the indent and use some wadding to prevent it reshaping and fouling the sub, I used some thick foam pipe insulation. It's not very elegant but it does work, it just looks a little odd as one side does not match the other. Also, being a 4 door model, there is obviously nowhere to hide the amp, so it either has to be on show mounted to the boot panel or hidden in one of the voids underneath the boot floor liner (by removing one of the polystyrene liners.

AMSS 8P fitted.jpg

This upgrade works with all the stock head units fitted to this model of Audi and also with any aftermarket HU. I can provide just the enclosure or a complete system including wiring, amp, sub and wiring adapter. The wiring adapter is a must if you are fitting the system to a stock Concert, Symphony or RNS-e HU as you can pick up all the feeds from the Audi sub loom in the boot without cutting any of the stock wiring. This enables the system to be returned to standard when you need to sell the car. The only additional wiring required is a 40a fused power cable for the amp, which needs to run from the battery to the rear speaker panel, full instructions are provided on how to do this or we also provide a complete installation service if required for £80.

The transformation is dramatic. Not only do you get proper clean punchy bass but you can now run the HU with less bass going to the cabin speakers which improves the overall sound as well and you can listen louder without distortion.

Previously we've only made these to order for enthusiasts on the audi-sport.net forum, here are some reviews from previous customers:






"This is a fantastic top quality build as you expect in an Audi. It generated a lot of interest and Awesomes 20th Brithday Bash last Sunday.
I have not been able to use my car as much as i would have liked over the last week, but I was in my element driving back to Manchester from Southampton including hitting Birmingham at peak rush hour but hey I had my tunes.
I have Bose and the sub works in harmony with Andy's custom sub and enclosure.
I'm not acoustic engineer but I do know what sounds good (and looks good - not that there is anyhing to see once the rear internal 1/4 panel was re fitted).
It seems to let the exsisting Bose speakers do what the REALLY should do. The mids are solid and the tweeters are crisp and sweet - it seems to let the Bose system 'Breathe' if that makes sense. The 6.5" JL sub is punchy, very defined and clear and takes up NO space (great in the A3 and even better in a Quattro) the risk of damage to the sub is also reduced.
I'm more than happy for any one to have a listen if anyone is near Manchester/Liverpool area - because no amount of words can describe how it sounds.
Thanks again to Andy for a quality install."
Steve from Warrington

"Cheers Andy, for the professional install and amazing set up. Drove back to Coventry and thought.. sweet Jesus, Lord have mercy it sounds perfect. I know my audio inside and out... and I'm an SQ fanatic and not SPL but I like bass that stays in the car, doesn't travel and balances out to let the other speakers do the job... and this set up does just that without losing boot space... I know what it's capable of but keeping it set to minus bass with balance on mid way is more than enough for the smooth sound I am looking for with the rich and natural bass and mid-bass. So thank you for making an enthusiast happy."
Gurpreet Bhambra - Coventry

Once you've run the power for the new amp, then it's a relatively simple process to pick up the rear pre-outs from the existing Bose amp, without cutting any wiring. I can provide an RCA loom with mini wire taps in order to do this. You need to first remove the drivers side boot panel to get to the Bose amp, then release the lock on the Bose connector and unwrap the tape holding the big bunch of cables together. Identify the wires from the diagram below and attach the wire taps. Don't rely on the cover on the tap to push the skinny wires into the tap, I always use a stanley knife to push the wire into the tap, all the way down in order to guarantee a good connection. then test the connection with a multimeter to ensure everything is making contact before putting it all back.

The installation manual is available for download here: