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2 'lesser quality' subs = 1 'good' sub? - Page 8

post #211 of 216
1/12/12 at 6:25pm
Thread Starter 
sometimes it feels like king kong is banging on the walls
still want to experiment more with placement however
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post #212 of 216
1/21/12 at 1:59pm
Thread Starter 
robert
technical question about sub cabinet stuffing:

what is the effect of more or less polyfil?

all i know is it apparently makes the driver think it is in a bigger cabinet, but i dont know what effect that has
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post #213 of 216
1/21/12 at 4:15pm
It slows the sound waves on the back side of the driver (in the box) by converting motion into heat. The driver sounds like it is in a box about 10% larger then it really is. That lowers the enclosure's final Qtc a little. Depending on what the Qtc is, it may raise or lower the Fs also.
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post #214 of 216
1/21/12 at 5:03pm
Thread Starter 
thanks again
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post #215 of 216
1/30/12 at 8:44am
Thread Starter 
robert
i put felt pads under my subs, mainly so i can move them around easily on my wood floors. but now i dont need to move them around much if ever.
im wondering if the footing matters much at all. my google search didnt help.
would the ideal situation be having the sub bolted down immobilized, and the less immobilized the less ideal?
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post #216 of 216
1/31/12 at 6:14am
There are 2 schools of thought here. One group likes their subs de-coupled from the floor. There are those riser pads available from a few sources that will fit under the sub. I'm in the other group. I want my sub solidly on the floor. Either make it big enough so that it doesn't move or add speaker spikes so it is on a solid base.

I've never seen any scientific data on either method but the 2nd makes sense to me. With a forward firing sub, it generates a lot of back and forth motion. If the sub is on a soft pad then it will rock. If it is on a solid base, it won't move. The forces will be transmitted into the floor and in my case that is a concrete foundation.
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