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  1. #1
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    13.5" Subwoofer hidden in A3 Sportback

    First, I have a 2012 A3 TDI Sportback, US model, so it may have differences from other country models. It is the "Titanium" edition, which I think is called the Black edition in other countries, as all of the trim is blacked out. I purchased it with the RNS-E with navigation.

    All I wanted to do is replace the factory Bose subwoofer with a decent one. First option was AndyMac's system, however my understanding is that it does not fit in the Sportback because Audi reshaped the side trim area quite a bit.

    While looking around in the car, I noticed that there was a lot of room over the spare tire. They put a tiny temporary spare instead of a full sized one, but the the tire well can fit a full sized spare. Measuring from the spare up to the flat foam surround is about 4 inches. That is quite a bit of usable space.

    So I started looking around at thin subs, and ran across the JL Audio 13.5" 13TW5-3 Thin-Line Subwoofer. It only needs 2.5 inches of depth, and 0.80 cu. ft. if air space in an enclosure.

    Around the same time, I ran across Nik Brewer who has been making custom sub enclosures mainly for VWs, like Golfs, Jettas, etc. His enclosures typically replace the Styrofoam that surrounds the spare tire well, where the jack and other tools are kept. One of his enclosures would have worked fine, however I wanted to try and use a much larger sub than the small enclosures can handle.

    He custom made an enclosure that exactly fit on top of the spare tire. With the thin sub, I didn't want to take a chance on the speaker getting damaged, so I purchase the metal mesh grill for it. The grill went higher than the stock floorboard, so I created another floor board made of 3/4" MDF, with a hole in the center for the subwoofer grill. I then purchased one of the Audi trunk mats to make it all look stock.

    Nik created the enclosure with a separate area for me to install the sub amp. I used a JL Audio JX500/1.

    It won't win any SPL contests, but it sounds much better than stock with a nice deep bump in the bass. I hooked up the amp the same way others have done, based on the instructions from AndyMac, and unplugged the stock Bose sub.

    I don't know if it's a requirement for Nik to be an approved vendor on the forum, so I have not included any contact info, but people can PM me. If it's OK to post info here, like his website and email address, someone please let me know. I think he did an outstanding job on the enclosure.
















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  3. #2
    Zak0123's Avatar
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    Actually looks awesome too! In my 2011 A3 3 door I have a tyre inflation kit rather than a spare tyre (think this is common in the later models) and am looking at doing something similar! Nice!
    Brilliant Black 61 Plate A3 1.6 TDI

    Mods: S3 BE 5 Spoke Rotor Wheels with Goodyear EfficientGrip
    , AppRadio 2, 80% tints, Diamond Vision Headlights

  4. #3
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    Good work I really like that....

  5. #4
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    love the work, looks neate too, jus hope u dont need the spare lol

  6. #5
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    Quote Originally Posted by TomMycroft View Post
    love the work, looks neate too, jus hope u dont need the spare lol
    It is removable, so if I need to get to the spare I only need to unhook a few wires and lift it out.

  7. #6
    Ash187's Avatar
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    WOW! so you have the spare wheel still in place, plus all the bits in the foam and still have a sub and the boot available to put stuff in it, very impressive.
    does anything rattle when you have the sud pumped up?
    A3 Sportback 2.0TDI
    Dark Headlining, Bose, Alcantara Leather, Lights Pack

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    S3 facelift, 19" RS6, RS3 Grill, TTRS FBMFSW, A5 S-Line Heated Seats, Bi-Xenons, Auto Lights & Wipers, Eibach Sportlines, S3 brakes, Cruise, Pioneer HU, Reverse Camera, OEM Parking Sensors, Auto Folding & Dimming Dumbo Mirrors, LED Tail Lights, S3 Pedals, Tints, Carbon Trims.

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  8. #7
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    That is tasty mate - ive been thinking about ripping out my full size 15" for a 'thin' sub

  9. #8
    Ash187's Avatar
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    any pics what it looks like underneath the sub?
    A3 Sportback 2.0TDI
    Dark Headlining, Bose, Alcantara Leather, Lights Pack

    MODS:
    S3 facelift, 19" RS6, RS3 Grill, TTRS FBMFSW, A5 S-Line Heated Seats, Bi-Xenons, Auto Lights & Wipers, Eibach Sportlines, S3 brakes, Cruise, Pioneer HU, Reverse Camera, OEM Parking Sensors, Auto Folding & Dimming Dumbo Mirrors, LED Tail Lights, S3 Pedals, Tints, Carbon Trims.

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  10. #9
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    Quote Originally Posted by itwasntme187 View Post
    WOW! so you have the spare wheel still in place, plus all the bits in the foam and still have a sub and the boot available to put stuff in it, very impressive.
    does anything rattle when you have the sud pumped up?
    Nope - nothing rattles. Well, outside the car I can make the rear license plate rattle, but nothing inside the car.

  11. #10
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    Quote Originally Posted by itwasntme187 View Post
    any pics what it looks like underneath the sub?
    The first picture above shows what is under the sub enclosure. If I were to remove the spare tire It would be more like 8 inches deep. The sub enclosure that Nik created is 4 inches deep and fits right on top of the spare tire. This is one of those rare cases they made a spare tire, wheel, center locking knob, etc that is all almost flat. Usually, the center sticks up higher or something.

  12. #11
    Ash187's Avatar
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    i need to have a good look at my boot! i know that i dont have that foam thing on the outside or the wheel but instead i have the foam in the middle of the wheel

    looks something like this:




    going to see if i can find that foam thing you have.... but im not sure it will fit in mine as the boot floor already seems to be as high as it will go. wondering how low your boot is and how deep it is as it looks to be deeper than what i have in my 2.0 TDI
    A3 Sportback 2.0TDI
    Dark Headlining, Bose, Alcantara Leather, Lights Pack

    MODS:
    S3 facelift, 19" RS6, RS3 Grill, TTRS FBMFSW, A5 S-Line Heated Seats, Bi-Xenons, Auto Lights & Wipers, Eibach Sportlines, S3 brakes, Cruise, Pioneer HU, Reverse Camera, OEM Parking Sensors, Auto Folding & Dimming Dumbo Mirrors, LED Tail Lights, S3 Pedals, Tints, Carbon Trims.

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