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  1. #1

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    Sep 2006

    Default Polk/Momo subs - freeair?

    there are specs for sealed and of course ported and bandpass boxes can be built...but can they be run freeair as well?
    1991 Nissan Skyline GT-R, Nismo Omori/Momo interior and Polk/Momo stereo (C300.2/C400.4/MMC6500/MMC650/MM2104DVCx2, and Sony BT5000 bluetooth head unit)

  2. #2

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    Sep 2006


    The Polk subs are not meant for free-air, to the best of my knowledge. I believe a stiffer surroud is required to provide the necessary damping in a free-air application. I saw that Kicker makes some subs that can be run free-air, if desired.
    1999 Honda Civic LX - 105 gerbils at the flywheel!
    Sony CDX-GT100 Head Unit
    Rockford something or other 6.5" in the front. I'm taking donations for MMC6500's!
    Polk Momo MMC690 6x9's in rear
    Polk Momo c300.2 amp via 4ga. and a 1.5 Farad stiffy
    Polk db804 8" Subs x 2, in sealed box.

  3. #3

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    Jul 2004
    Jersey Shore


    I'm sure it could be done, but you would need to use significantly less power. Try e-mailing Polk CS for an answer.
    1993 Ford Ranger super cab:
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    in need of amps and subs

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  4. #4

    Member Sales Rating: (1)

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    Dec 2003
    Sooner Country


    Good free air subs require lots of cone travel (xmax) since there isn't any box to give back pressure to control movement. Deep motors and stiffer surrounds help with this.

    The 12 inch Momo subs only have 9.5 mm Xmax so they won't push alot of air when driven to full excursion. The SR 12 inch would be a better IB sub at 16 mm of travel, but there are still better choices on the market with 20-25 mm of travel when you consider price since free air setups require more drivers to get good bass, normally double the drivers.

  5. #5

    Member Sales Rating: (40)

    Join Date
    Jul 2001
    North Texas


    Linear excursion does have some to do with it, but it's mostly all about Q.
    Check your lips at the door woman. Shake your hips like battleships. Yeah, all the white girls trip when I sing at Sunday service.

  6. #6

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    Dec 2003
    Chattanooga, TN


    From a strict SQ standpoint, just about any sub will work free air but, as was mentioned, power handling is reduced substantially as is SPL. Thats why its best to use a bigger sub for IB setups because a 12 will produce lower frequency bass easier with the less power than a 10 will.

    Ive always heard that if the sub's Qts is between .5 and .7 it will work fine in IB. The Momo 12 has a Qts of .52.
    polkaudio sound quality competitor since 2005
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    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

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