02-22-09: Commcat
Harshness can also be caused when the drivers (speakers) are stressed. Insufficient power can create this problem, whether using tube or solid-state amplifiers. One remedy to try is heavy-gauge speaker cable, i.e., 4 gauge, 1600 strand copper (often marketed in raw form as power-cable).
Seriously dude?
I ran 8 gauge cable for an oven when remodeling our kitchen a few years ago. That stuff is extremely stiff and difficult to work with. How in the world are you going to connect 4 gauge to your amp and speakers. If you have done it please post your system with pics for the world to see.
Now you got me wondering what gauge cable is feeding my house from the transformer.
As for harshness, I agree with Mrtennis (can't believe I said that). In a general sense I see the culprit as metal dome tweeters squeezing that last little bit of resolution.
I don't listen to super systems so my opinion only relates to real world equipment.