Sounds good. One of us should try the upgrades and compare what we hear different. I don't think they cost anything; I think they go from non-inverting to inverting and add a resistor. I too like the amp as you can tell; if I had to live with it I could. I have all the parts and the circuit boards for the ESP DOZ pre-amp. I tried to use premium parts so naturally nothing fit on the board and it required a lot of creative wiring so is not up and running as of yet. But that is the pre I plan to run with the GC. Stupid that I bought all the passive parts before measuring the clearances on the board. It is a pretty popular SS pre-amp on the ESP site.