Thanks, Gonk,

I was experimenting with stereo, bypass, upsample and PLII music (which seems almost overproccessed).

I'm currently doing very little with the main system's speakers as they're still in the shop, in the process of a rebuild. I should have received them over a month ago, but am told it'll only be a few more weeks ... uh huh! lol So, in the mean time, it's headphones all the way.

While the 990's headphone amp is sufficient, it doesn't compare with this external headphone amp. The K701's like power and so if you like more of an analytical sound, the 990's headphone amp is fine. If you're interested in bass, colour, depth, richness and texture, then, adding an external headphone amp is like entering a new world.

Anyway, that's where I'm at now. And, again, thanks.

John