Bass speaker cables

I'd look at Premier speaker cables at www.interlinkhouse.com or else email the designer, stnemo@starpower.net. He once recommended Premiers to me, for a similar goal to yours: they can carry a lot of current. One thing I'd bet the rent money on: they're worlds better than any AudioQuest cable. I've had both, though in a lower-power system than yours.

Audioquest Midnights are EXCELLENT for the low end, but have WAY too much roll-off for full-range IMHO.

I have some new Analysis Plus Oval 9 's which have great bass. What length do you need?

Additonal info: I am running 4 foot runs. My current top end cable is AudioTruth Clear. The current bass is AudioTruth Argent. I can't reverse the cables due to the Fisher connectors on the Levinson amps on the top end. Although I agree with the comment on Midnights, I don't think they would be an improvement over the Argents.