Best DIY tweak?

Oh yeah, another DIY tweak would be cleaning all the connections between cables with alcohol to remove any oxidation that might get in the way of the signal path. Worth doing at least once or twice a year. Try it, and you will be amazed.

Replace steel speaker driver screws with solid brass screws; dramatic results!

That's not a tweak, man.......that's a mod. Where's your entrepreneurial spirit?

Hey Darosenb: I do that all the time! It sounds like i just doubled the amount of drivers in my speakers!
Cheers!

I gotta hand it to you, Liz..........