I am looking at buying a used Hartke 5000, and am a little confused on the wattage rating. Here are the power ratings from the Hartke site: The amp has four 1/4 outputs, labled 8 Ohms each. Two for high-frequency and two for low-frequency. For Bi-amp operation, I will be connecting an Ampeg SVT-210 (8 ohms) to the high-frequency output, and an Ampeg SVT-15EN (8 ohms) to the low frequency output. Are these speakers now in parallel, for a total of 4 ohms? Or since this is bi-amped, and the output is seperate for the channels, am I simply running two 8 ohm speakers from two "amps", so I am getting 170 Watts into each speaker? Could I hook up four cabs to this amp to get the maximum 500 watts output? Thanks for any clarifications!