I owned the 75se and the 150se. I can't exactly put it in words but, I much preferred the 150se. I would go with the 150se and bi-wire.
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I did try the MC2000 and felt the 800's were starved for power on the lower end. Would like an amp that can drive the bass at lower dbs without blasting the mids and highs to an uncomfortable level....anyone ever bi-amp a pair of 150se's? 4 large chasis sounds extravagant but at under 4000.00 an amp here on Audiogon, very doable.
I am sure bi-amping four VK-150SEs will work very well. You can also connect two VK-150SEs together and make a 300W mono on each side. The only problems are electric power and heat. These BATs run really hot and draws 500W at idle and 1000W at full power. So four of them will draw over 18A current on 110V line at idle. You will need at least two preferably four 20A dedicated circuits to power them.