You are in a bass node,a place where direct & reflected bass energy are "piling on".You can adjust speaker distance from wall behind them,your listening chair foward or back,bits of both and or add bass traps starting with corners behind speakers.I would start out with adjusting placements,which will take patience and time but cost nothing.Bass traps and room treatments should help in all areas of sound such as image focus and harsh or bright reflective energy.There are links to diy basstraps that are very effective and attractive along with other room treatments.You have just discovered that the "room" is a big factor in sound and of major importance to end result.
Standing vs. Seated-Big Difference in Bass???
I own some Soliloquy 6.3's. The speakers are approx 7 ft apart and sitting area approx 8-9 ft. back. When I stand the bass is perfect. When I sit (same distance)the bass seems to be reduced approx 50-60%. Can someone tell me what is going on? I can do no better than getting 18 inches from back wall, large room 20x22 with semi vaulted ceiling. I have not installed the spikes. Using AR Vs110 (100 watt tube) amp. HELP
Bob
Bob