Imho most all sub s are placed on carpeted floors and most are downward firing.
Downward firing subwoofer on carpet.
Inside the subwoofer enclosure is the speaker driver consisting of the cone frame coil assembly and magnet the cone vibrates producing sound waves in the air.
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My rel sub is on carpet and fires down.
Is it worth the time to cut out a small 13 x 13 piece of plywood to sit the subwoofer on to increase bass rather than just have it sitting directly on the carpet.
First if your subwoofer is ported on the rear of the cabinet you can stuff the port with tennis balls rubber balls or even rolled up socks to seal the cabinet and cut down its interaction with.
Although carpet will absorb some of the sound it is better to place the down fire on carpet than it is on hard smooth surfaces as these will reflect sound directly and cause a boomy listening experience that can be fairly unpleasant.
Most down firing subwoofers are placed on softer surfaces such as carpet.
If your home theater room is carpeted you ll probably have an easier go of figuring out the speaker system that you otherwise might in a hard floor room.
I just ordered a pswi 225 down firing wireless sub.
My family room is fairly small 15 x 12 and carpeted.