Isolation platform for subwoofer? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 32 Old 06-14-08, 05:38 AM
deadhead
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Isolation platform for subwoofer?

Folks,

Does anyone use an isolation platform for their sub, like an Auralex Great Gramma? Pros and cons?

Thanks,

deadhead
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post #2 of 32 Old 06-14-08, 08:59 AM
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Re: Isolation platform for subwoofer?

Depends on your floor. With a sprung wood floor, all pros, no cons.

Kal
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post #3 of 32 Old 06-14-08, 12:09 PM
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Re: Isolation platform for subwoofer?

I'm using the Great Gramma with an SVS PB12-Plus/2 which was sitting on a wooden floor. IMO it sounds better with the platform but it's not something that I can measure.

Bob

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post #4 of 32 Old 06-14-08, 01:20 PM
 
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Re: Isolation platform for subwoofer?

Items such as these decouple the subwoofer from the floor minimizing resonance that occurs. These items are even useful on carpet as carpet is not effective in decoupling a subwoofer from the floor due to wavelength size in the bandpass.

If ones goal is achieving maximum fidelity it is essential that the subwoofer be decoupled from the floor. At the same time many people seem to prefer the perceived greater bass, primarily in movies, created by having a subwoofer coupled to the wall, as in IB, or floor, as is more typical, due to the resonances created and felt in the form of excess vibration.
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post #5 of 32 Old 06-19-08, 05:09 PM
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Re: Isolation platform for subwoofer?

so-decoupling, but how? on a box? concrete blocks? how high? your insights are appreciated.
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post #6 of 32 Old 06-20-08, 11:33 AM
 
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Re: Isolation platform for subwoofer?

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yacht422 wrote: View Post
so-decoupling, but how? on a box? concrete blocks? how high? your insights are appreciated.
walt / yacht422
The easiest way to decouple a subwoofer would be using a product such as the one asked about in the original post, the Auralex Gramma pad. The pad is essentially a piece of carpeted hardboard with a few inches of stiff latex foam that will not compress greatly with weight. While this foam is stiff, it is not stiff enough to actually transmit energy from the subwoofer to the surface it is placed on so it is decoupled.
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post #7 of 32 Old 06-20-08, 12:37 PM
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Re: Isolation platform for subwoofer?

andrew: thx for the advice. most of the sound "stuff" is still smoke and mirrors to me - some good info, some advertising hype, some truly essential items. as this is my 1st h/t, i'm reading and asking everywhere/one!
again, my appreciation
walt
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post #8 of 32 Old 06-20-08, 12:50 PM
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Re: Isolation platform for subwoofer?

Quote:
yacht422 wrote: View Post
andrew: thx for the advice. most of the sound "stuff" is still smoke and mirrors to me - some good info, some advertising hype, some truly essential items. as this is my 1st h/t, i'm reading and asking everywhere/one!
again, my appreciation
walt
Start with concrete blocks and a carpet sample ($4 investment). If you hear a difference, then you can plan on spending more on the real thing down the road.
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post #9 of 32 Old 06-20-08, 01:47 PM
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Re: Isolation platform for subwoofer?

walt here: i am in fl., nd the floor is 6" poured concrete, padding, carpeting.
so - - - what are the advantages of decoupling? is it sonic, or viseral?
thx
walt
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post #10 of 32 Old 06-20-08, 02:02 PM
 
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Re: Isolation platform for subwoofer?

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eugovector wrote: View Post
Start with concrete blocks and a carpet sample ($4 investment). If you hear a difference, then you can plan on spending more on the real thing down the road.
This method will not actually decouple the sub from the floor or the concrete blocks. The thickness and density of the carpet as it relates the wavelength produced by the subwoofer is not sufficient to remove transfered resonances.

A possible solution one could use for testing would be buying the foam comfort pads that are sold at Walmart for about $10. Cut it into 4"x4" squares and glue a 3 or 4 of these squares together. Then either place these feet on the bottom of the subwoofer or for a more stable approach glue the foam feet to a piece of hardwood and place the subwoofer on it. Alternatively, one could purchase foam online and build a decoupling unit fairly easily that could look far more professional and nicer than the Auralex offerings.
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