LCR subwoofers with center subwoofer playing out of phase sounds?

[olds1959special]

AND I put the center speaker under the table...

 

[olds1959special]

I turned off all the speakers except for the three mono speakers (center front subwoofer, monitor on top of it, and the center speaker on top of desk.) and was able to get a flattish response from my listening position by turning up the speakers all the way, then turning down the bass all the way and the treble up all the way on the top speaker, using the controls on the Fosi BT20A. I'm using 100Hz HP filters on both speakers. The subwoofer is set to 100 Hz LPF to match, and is adjusted to be about the same level as the highs.

I feel like the center channel really helps to fill in the vocals that can sometimes feel missing, without totally sacrificing the stereo imaging. And there is no reason not to have the speaker under the table if there is also a center speaker on top of the table, I think.

 

[olds1959special]

I'm optimizing this system and got rid of the center speaker under the desk along with the subwoofer that was in the center. I'm not sure if I mentioned this before but I'm using a 10ms delay on the rears which use a subwoofer and it's crossed over at 80Hz.

Also I think it's important to lower the rear ambience recovery channel inputs L and R by at least 3dB for each channel because when these are combined this could possibly lead to clipping. This works fine since the rear channels are turned down anyway.

 

[olds1959special]

I'm using the midrange cut on the L/R because of the effect of having the center speaker recessed on the big wooden desk.