2 cubes per sub might be a tad small for L7's though. They like big boxes and they've got the cone area of a 15" woofer to boot. So you need a bit moreNo, thats not a lincoln.
Anyway, i would say 4-5 cubes tuned 30-36 hz depending on what you listen to.
I've never had a problem, but im only pushing rated.Don't L7's have a problem with the coils overheating? Or was that the last model?