Hey- I could use some answers. Noone has really told me exactly what "bi-amping" is. I have read that you can get great results by sending low frequencies to your woofer and the highs to a tweeter... I aim to do just that. I own a Hartke 3500, the matching 4.5xl and have my eye on an SWR Big Ben 18. My head has the two speaker outputs and I've gotten a pretty good sound by using a 15 in conjunction with the 4x10...is that bi-amping? I've spent most of my time learning to play and do not really know much about the gear side of things, any input would be greatly appreciated.