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Thread: Sub Isolation

  1. #1

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    Question Sub Isolation

    Been readin' a lotta posts about subs vs. NAF (neighbor acceptance factor). So, to head off trouble at the pass, I set my Dayton Titanic (don't even start!) on a $3 cement paving stone on carpet over a cement subfloor to add mass and hopefully reduce transmission of floor vibrations to the neighbors below. Now I'm looking for isolation feet to replace those gorgeous black chrome spikes 'cause they punch right into the cement stone under the sub's 55 pound weight.

    There are a several comments in these forums about VibraPods, but $80 for a set of 4 seems to me just a bit over the top. Has anyone come across QuietFeet? Their size and construction appear to be almost identical to VibraPods, but at a quarter of the price.

    QuietFeet Info

    QuietFeet Review (On the left in the Latest Reviews column, click on QuietPC QuietFeet)

    And, NO, I don't work for 'em!
    Last edited by silverghost; 03-28-2004 at 08:05 PM.
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  2. #2

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    Umm . . . nuthin'?
    Yamaha HTR-5640
    Sony NC665P DVD/CD
    Polk RTi70 Mains
    Polk CSi30 Center
    Polk FXi30 Surrounds <- RTi38 <- RTi28
    Dayton Titanic MKIII Sub

    HK AVR330 SOLD! to Jim Wy :D

  3. #3

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    give them time it is a sunday and you know how deeply religous every one on this forum is dont you.
    Wish I was a polkologist then I could call my self Dr.warviper.

  4. #4

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    Originally posted by warviper
    give them time it is a sunday and you know how deeply religous every one on this forum is dont you.
    What? No fellow heathens among us??
    Yamaha HTR-5640
    Sony NC665P DVD/CD
    Polk RTi70 Mains
    Polk CSi30 Center
    Polk FXi30 Surrounds <- RTi38 <- RTi28
    Dayton Titanic MKIII Sub

    HK AVR330 SOLD! to Jim Wy :D

  5. #5

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    Nebber mine . . . Just came across another QuietFeet review, one that made me step back and think twice about using these things.

    See this.

    According to that one, both a DVD player and a Home Theater PC mounted on these things tended to move / shimmy after installation of the pads. That probably confirms their vibration absorptive qualities, but it also indicates they are not a stable coupling device for something like a subwoofer.

    Today, I located some dense rubber tips that perfectly matched the diameter of the black chrome feet. They even had a nib, or prong, that fit right into the treaded holes left empty after removing the sharp spike tips. They protect that black chrome from abrasion while firmly coupling the sub to the cement slab.

    Now I gotta hear what it sounds like, and hope the NAF improves!
    Last edited by silverghost; 03-29-2004 at 08:58 PM.
    Yamaha HTR-5640
    Sony NC665P DVD/CD
    Polk RTi70 Mains
    Polk CSi30 Center
    Polk FXi30 Surrounds <- RTi38 <- RTi28
    Dayton Titanic MKIII Sub

    HK AVR330 SOLD! to Jim Wy :D

  6. #6

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    The only thing that occured to me after first looking at the specs was how much weight each foot could take. This seems to be cost effective in an inversely proportional relationship to the weight of the object. A 55 pound sub MIGHT not be a problem but there are certainly subs out there that weigh 2-4 times that much.

  7. #7

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    Originally posted by PolkWannabie
    The only thing that occured to me after first looking at the specs was how much weight each foot could take. This seems to be cost effective in an inversely proportional relationship to the weight of the object. A 55 pound sub MIGHT not be a problem but there are certainly subs out there that weigh 2-4 times that much.
    Absolutely correct! Mine is at the upper weight limit of the largest pad. Anything heavier would be asking for trouble.

    EDIT

    On the other hand, I would hope that a 100-200 lb sub would only be used in a single-family home anyway. In that case, floor vibration / NAF wouldn't be as critical an issue and this sort of pad wouldn't be necessary.
    Last edited by silverghost; 03-29-2004 at 09:03 PM.
    Yamaha HTR-5640
    Sony NC665P DVD/CD
    Polk RTi70 Mains
    Polk CSi30 Center
    Polk FXi30 Surrounds <- RTi38 <- RTi28
    Dayton Titanic MKIII Sub

    HK AVR330 SOLD! to Jim Wy :D

  8. #8

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    Just my opinion, but the cheapest and most effective way to isolate vibrations on a big heavy sub would be to purchase 4 hockey pucks and set the sub's corners on them.

    Just my opinion, but I think you would be hard pressed to find a better way to contain almost all vibrations produced within the sub and keep them from resonating into the floor.

    No chance of the sub shifting on the pucks either.

    Make sense?
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