Greetings! I just got a GK 800RB. So far, I've only used it with my 2x12. I've never used a crossover before, so, I was wondering how you experienced crossover players use yours. The crossover frequencies available are 100-1000hz, I believe. I've got the following cabs: 2x10 at 8 ohms 1x15 at 8 ohms 2x12 at 4 ohms So far, all I've been able to find on crossovers is that you want one the has available frequencies below 200hz and that some usually set their's at 125. With a bi-amp system, where does the punch come from? What note is 125 hz? (any handy guides on the interenet for frequency to bass notes?) I'm definitely going to do some experimenting. However, I find it's nice to get some basic understanding before experimenting. Thanks!