Downward Firing Sub Carpet
Since the floors connect to the walls they re also going to shake.
Downward firing sub carpet. The higher order harmonics when radiating direct were definitely localizing lower mid bass notes and distorting the sound stage probably due to the. Since the subwoofer is there to push deeper sounds and longer wavelengths the sound waves it s producing simply won t be affected as much as shorter wavelength sounds like those produced at the rest of the speakers in. Down firing also tends to mute any higher order issues. 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.
After that the ceiling comes next. Main theater and living room but mine have a surface which is part of the sub itself example psw1200 has a down firing power port that fires to a base surface inwhich the sub. Most down firing subwoofers are placed on softer surfaces such as carpet. A down firing subwoofer box produces a domino effect if placed inside a room.
And even for a down facing subwoofer the amount of sound being absorbed by the carpet is likely going to be negligible. I have a downword firing 12 inch ksw klipsch sub i now wish i had been smarter and done my homework and bought a better sub for the price anyway on the klipsch forums several posters suggested that if you have carpet like i do to put a large ceramic tile underneath the sub. And since the shaking directly affects the floor the floor starts shaking.