Thanks for the good responses.

The reason you guys set the crossover at 55hz and 50hz is because your speakers' base response goes down as low as 55hz and 50hz?

Meridian 861v2
Bryston 3B SST, Bryston 5B ST
JM Lab Electra 926 + CC901 + SR900 + REL Strata III
Pioneer Ellite AVi-79
Optoma H77, Carada 100"
Dell E510, M-Audio Transit