Generally no sub with my M60s. I don't know exactly why (could still be setup), but my ears don't seem to like having crossovers in the bass region.

When I had a PSB 6i sub I felt that most pop CDs ended up with too much bass even though I had matched levels using pink noise from the Avia CD. When I replaced the PSB with an SVS 20-39PC+ the "too much bass" problem pretty much went away, although the deep bass was better and I had again matched levels with the Avia tracks. I still slightly preferred the sound without the sub though.

I finally found one album which definitely sounds better with the sub than without -- Bif Naked's latest, "Superbeautifulmonster" seems "right" with the sub on but a bit thin without it. Don't know why yet.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8