SubWoofer Help ASAP...

You might try moving them away from any corners first.

Yes-keep moving the sub away from the corners, behind your speakers is usually a good place. However, a suspended wood floor (I assume its suspended wood rather than concrete since youre on the second floor) will probably never sound as good as a concrete floor but im sure you can find a place for the subs that is not boomy.

Good luck with your downstairs neighbors.

There are many ways to configure your subs. Not just positioning, although that is the most important, but also try placing them on theirs sides, up and down and pointing in all positions. It is really hard to place subs and without very sophisticated equipment (and even with, as stated by Harman Kardon in their white papers) it is a case of trial and error.

Check your crossover point maybe set to high. Move away from all boundaries if possible. Make sure all connections are right. Good Luck

I posted the following in another thread a couple days ago...
_____________________________________

IME, the two simplest and most effective methods for subwoofer setup that require no equipment other than a SPL meter are...

METHOD 1: Optimizing frequency response. Place the sub at the listening position, then walk around the room and listen for the location where the bass is the most *consistent* across low frequencies. You can do this by ear with music, or you can use a SPL meter and low frequency test tones. Once you find the location in the room that has the smoothest frequency response, place the sub in that location. Now the bass response at the listening position should be in pretty good shape.

METHOD 2: Optimizing transient response. IMO, good transient response requires time aligning the sub with the mains. A procedure that can help with time alignment...

1. Flip the polarity of either the sub or the mains (but not both).
2. Play a test tone at the crossover frequency.
3. Use an SPL meter to measure the output level.
4. Adjust the sub position (or digital delay, if you have that capability) until you MINIMIZE the SPL at the listening position.
5. When the sub is in place, flip the polarity back so that the sub and the mains are the same polarity.

In steps 1-4, you are essentially maximizing the *destructive* interference between the sub and the mains. In step 5, you are restoring the sub to the correct polarity, which now maximizes the *constructive* interfere between the sub and the mains. That will help with both frequency response and transient response.

IME, the first method is the best place to start. When the sub is roughly in position, use the second method to fine tune.
______________________________________

Good luck.

Bryon