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  1. #1
    Veteran Member Four Rings
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    May 09 2012
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    08 A4 Avant, 05 Silver S4 2.7t swap
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    Bose sub speaker replacement

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    Anyone ever replace the Bose sub speaker? Have an extra box and a 200w D2 S8 amp Iím trying to incorporate.


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  2. #2
    Veteran Member Four Rings 8520's Avatar
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    Feb 07 2008
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    25012
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    04 Silverado V8, 06 Touareg V8, 03 RS6 V8TT, 01 allroad, 01 A6 6MT
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    The boonies, near Seattle

    I remember seeing some allroaders do it. There was some write up on quattroworld if I remember right.
    -dre

  3. #3
    Veteran Member Four Rings 8520's Avatar
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    The boonies, near Seattle

    This is what I could find.

    You might ping Julex about it.

    https://forums.quattroworld.com/allr...ds/23147.phtml
    -dre

  4. #4
    Veteran Member Four Rings
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    May 09 2012
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    My Garage
    08 A4 Avant, 05 Silver S4 2.7t swap
    Location
    Virginia

    Bose sub speaker replacement

    Quote Originally Posted by 8520 View Post
    This is what I could find.

    You might ping Julex about it.

    https://forums.quattroworld.com/allr...ds/23147.phtml
    Thanks. Everything on the market currently is 4ohm rather than 2. How big a deal is that?


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  5. #5
    Veteran Member Four Rings V1nny's Avatar
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    Dec 04 2012
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    Arlington VA

    replacing 2ohm speaker with 4 ohm would make you to lose half of loudness of that particular speaker.
    if you manage to find a subwoofer with 2 4 ohm coils, you can run them in parallel to get to 2ohm total.
    I think I might have one 6.5" woofer somewhere in storage. Confirm the size, and I will check what i have.
    Last edited by V1nny; 12-03-2018 at 06:07 AM.

  6. #6
    Veteran Member Three Rings
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    Jun 07 2005
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    Shepherdstown, WV

    4ohm subs I assume you mean is what you are finding on the market since you are using the s8 amp?

    If you find one that is dual voice coil (dvc) 4 ohm and wire it so that it is parallel off the 2 ohm amp to each voice coil that will be 2 ohm load. I think some of the stock subs were actually wired like this.

    Or it is safe to use a 4 ohm sub on a 2ohm amp it just won't be as loud.
    80 rabbit pickup, 98 TJ 4bt cummins, 00 180TTQ 6spd, 02 Freelander, 03 Allroad 2.7t 6spd swap now with K04s, 06 A3 2.0T w/GT3071R (2012 JSW TDI and 2015 GSW TDI now in TDI purgatory )

  7. #7
    Veteran Member Four Rings
    Join Date
    May 09 2012
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    My Garage
    08 A4 Avant, 05 Silver S4 2.7t swap
    Location
    Virginia

    Bose sub speaker replacement

    Quote Originally Posted by chris86vw View Post
    4ohm subs I assume you mean is what you are finding on the market since you are using the s8 amp?

    If you find one that is dual voice coil (dvc) 4 ohm and wire it so that it is parallel off the 2 ohm amp to each voice coil that will be 2 ohm load. I think some of the stock subs were actually wired like this.

    Or it is safe to use a 4 ohm sub on a 2ohm amp it just won't be as loud.
    Yes, 4ohm subs though I did find a 6.5Ē 2 ohm kicker sub that I could probably home brew. The stock Allroad amp is 50w while the S8 amp is 200w. Since they both used 2ohm Bose speakers, Iím trying to replace with 2 ohm subwoofer for efficiency.

    Trying to keep this as OE as possible and on a budget.


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  8. #8
    Veteran Member Three Rings JediJoker7169's Avatar
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    Dec 11 2009
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    San Francisco Bay Area/CA/USA

    Quote Originally Posted by V1nny View Post
    replacing 2ohm speaker with 4 ohm would make you to loose half of loudness of that particular speaker.
    Isn't that exactly opposite? Higher impedance = higher efficiency, so to produce a certain SPL at 2 ohms would require twice the power as at 4 ohms.
    - JediJoker

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  9. #9
    Veteran Member Four Rings V1nny's Avatar
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    efficiency depends on many mechanical properties, and magnet field strength, there is no direct relationhip between impedance and efficiency, though in some cases it can be true. I simplified impedance->loudness relationship, but if we want to look into it, given all other speaker properties are the same, most amplifiers output is reduced by about half (lower current) when impedance is doubled.

    Also sharing an idea, if you step up to a subwoofer with very large magnet, like I did on my non-bose Allroad sub, in order to save internal volume of subwoofer enclosure, you can flip the subwoofer and install it magnet facing outside the box.
    Last edited by V1nny; 12-03-2018 at 09:02 PM.

  10. #10
    Active Member Two Rings
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    Dec 01 2017
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    '01 AR 2.7T TP, '83 Mercedes 300TD, DEAD '03 Allroad yet to be resurrected
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    Olathe, CO

    With the stock box, does one have the Room to do that? I don't think so...



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