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  1. #1
    Veteran Member Four Rings Valpo A7's Avatar
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    Nov 27 2018
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    2018 Jeep Wrangler JLU; 2015 Mas Ghibli SQ4; 2005 Gulfstream Motorhome
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    Valparaiso, IN

    What can I do to improve the base from the Bose sub without replacing it

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    I used to be fine with the Bose system in my A7 as it was better than what I have had previously in a domestic system. Yeah it’s got its flaws but at the same time it still isn’t all that bad to me. Well when we got the 18 Wrangler with the Alpine system it showed me how weak the Bose sub is.

    I don’t want to replace the sub but what can I do to improve the sound without spending a time of money? Would that accustic foam or however you spell t help? Is it just a matter of turning up the system gain for the base?
    Last edited by Valpo A7; 04-25-2023 at 05:34 AM.

  2. #2
    Established Member Two Rings
    Join Date
    Dec 08 2018
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    432803
    Location
    Northeast

    Do you have sub in the trunk? If so, add an 8" sub and amp. I used Kenwood sub and Alpine amp.

    EDIT, just read you don't want to replace sub.. I can't help.

  3. #3
    Veteran Member Four Rings Valpo A7's Avatar
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    Nov 27 2018
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    2018 Jeep Wrangler JLU; 2015 Mas Ghibli SQ4; 2005 Gulfstream Motorhome
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    Valparaiso, IN

    Yeah trunk sub but with 228,000 miles on the car I would like better base but it’s just not worth dropping a new sub and amp into it.

  4. #4
    Junior Member Two Rings
    Join Date
    Mar 12 2023
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    907320
    Location
    UAE

    why not? it's a fairly easy job (at least on A6 where the battery is in the trunk and all the audio output lines are there too, so you don't need to route anything from the radio nor fight with the amp power connectors too hard).



    there is a load of space next to the original amp behind the trim on the left, so my tiny 600W amp fits like a glove there...

  5. #5
    Established Member Two Rings
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    Jan 26 2019
    AZ Member #
    446962
    Location
    Tulsa

    Out the door for less than $500. This is all I used and I love it for how cheap it was.
    If you want to spend more, JL has a slightly better powered sub.

    https://www.amazon.com/AudioControl-...NsaWNrPXRydWU=
    This is to help convert the signal to eliminate the bass roll off of the Bose system.


    https://www.amazon.com/Rockford-Fosg...4-dc28e6d374b3

  6. #6
    Junior Member Two Rings
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    Aug 04 2020
    AZ Member #
    557583
    Location
    New York, NY

    Stuff the sub box with this https://www.amazon.com/Fairfield-PF1...dp/B006I04VLU/

    I did it initially and it tightens up and deepens the bass a bit. If you don't want to change any electronics around, I'd recommend that. It tricks the speaker into thinking the subwoofer box is larger.
    asd
    Later I replaced the amplifier and sub driver in the stock enclosure which both made it even better.

  7. #7
    Veteran Member Four Rings Valpo A7's Avatar
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    Nov 27 2018
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    2018 Jeep Wrangler JLU; 2015 Mas Ghibli SQ4; 2005 Gulfstream Motorhome
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    Valparaiso, IN

    Quote Originally Posted by tagx View Post
    Stuff the sub box with this https://www.amazon.com/Fairfield-PF1...dp/B006I04VLU/

    I did it initially and it tightens up and deepens the bass a bit. If you don't want to change any electronics around, I'd recommend that. It tricks the speaker into thinking the subwoofer box is larger.
    asd
    Later I replaced the amplifier and sub driver in the stock enclosure which both made it even better.
    At that price I will give it a try. Is 1 bag enough?

  8. #8
    Established Member Two Rings
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    Dec 08 2018
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    Northeast

    Crutchfield is selling POLK 8" sub for 70. Pioneer for 80. Wiring 30. Lowpass Xover 25. 1 hour install at home.

  9. #9
    Established Member Two Rings DetroitV6's Avatar
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    May 28 2021
    AZ Member #
    602822
    Location
    Detroit

    I bought a used Rockford Fosgate P300-12 on ebay for ~$150. It has a high-level input so I spliced right into the stock bose subwoofer wires at the harness in the trunk. Another ~$30 for an 8ga OFC cable kit on amazon and that's it.

    You will never be able to tune the 8" bose sub to sound good. There's a reason people call it a subwafer, it's small and has awful frequency response.
    2015 A6 Prestige (034 Motorsport, Stage 2 ECU/TCU)

  10. #10
    Senior Member Three Rings Zombie5150's Avatar
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    Apr 18 2021
    AZ Member #
    598002
    My Garage
    2022 Audi RS5
    Location
    Boerne, TX

    Quote Originally Posted by Valpo A7 View Post
    At that price I will give it a try. Is 1 bag enough?
    I recently put a 10” JL sub in my RS5 and used that Polyfill. One bag was plenty for a single sub box. Also, if you’ve got a Hobby Lobby close by they sell it there for about $3 a bag.
    2022 Audi RS5 Sportback - Mythos Black
    Dynamic, Dynamic +, Dynamic Steering, RS Design, RS Driver Assist, Side Assist, Black Optic Carbon, Navigation, Rear Air bags, Black Rings & Emblems.

    Vossen HF-3/Michelin PS4S, Full Xpel PPF, Fusion Ceramic, Ceramic Tint, JL Sub/Kicker Amp, FitCam X, Tuxmat Cargo Liner, Emblem Debadge (F/R), MMI screen protector, MH62 IPOD Cradle, additional puddle lights.

  11. #11
    Veteran Member Four Rings Valpo A7's Avatar
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    Nov 27 2018
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    2018 Jeep Wrangler JLU; 2015 Mas Ghibli SQ4; 2005 Gulfstream Motorhome
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    Valparaiso, IN

    Quote Originally Posted by WideSuppie View Post
    Crutchfield is selling POLK 8" sub for 70. Pioneer for 80. Wiring 30. Lowpass Xover 25. 1 hour install at home.
    I may go that route after the speaker foam. Depends on what I can sneak past the family CFO.

    Car is a 2012 and very high mileage but its paid for so we are at the stage of its life to spend just what we need to keep it on the road and not in the shop.

  12. #12
    Veteran Member Four Rings Valpo A7's Avatar
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    Nov 27 2018
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    2018 Jeep Wrangler JLU; 2015 Mas Ghibli SQ4; 2005 Gulfstream Motorhome
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    Valparaiso, IN

    Stuffed the sub box yesterday and the improvement was marginal at best. I guess it’s time to start sourcing a better sub

  13. #13
    Veteran Member Four Rings Audibellybutton's Avatar
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    Jun 28 2019
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    California

    Quote Originally Posted by Valpo A7 View Post
    Yeah trunk sub but with 228,000 miles on the car I would like better base but it’s just not worth dropping a new sub and amp into it.
    let me say this...

    it is worth it to drop a new sub and amp into it.

    doing anything more than that will be a headache and probably cost more than its worth on the bose system.
    C7 Audi A7 Prestige 3.0t (RIP) - Dual Pulley E40 , Turtle TCU , Ported Blower, Meth, Porsche 997 TB, Merc Racing Heat Exchanger, CWA-100, RKX Silicone Intake hose, RS7 Airbox, RS7 LPFP, JHM 207 pulley,SRM Driveshaft Upgrade, H&R Springs, 034 Drivetrain inserts, Vossen VFS2, RS7 Steering Wheel, Autotech HPFP

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  14. #14
    Veteran Member Four Rings JWebb_C7_Comp's Avatar
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    Jan 11 2018
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    Civic, A6, Q7
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    Chi-Burbs

    Quote Originally Posted by Valpo A7 View Post
    Stuffed the sub box yesterday and the improvement was marginal at best. I guess it’s time to start sourcing a better sub
    I’ve seen posts and video on replacement in stock location. I believe there’s a pioneer sub that fits.

    That said, an LCI with powered sub would be very easy and can be used in another car once you decide to replace the A7.

    I used an audio control LCI/amp combo and also replaced the sub.

    I tested the Bose sub with more power and it sounded better but not awesome.


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