The ESX Q 604 was in pristine condition inside and out to say the least. There were no marks on the fins. It was never worked on or repaired based on my assessment of the circuit board and interiors. The screws weren't stripped. I would compare the condition of the amp to a car that was traded in with 5000 miles on it. The amp literally seems to be barely used if at all. I would give it a 9/10 easily.

Thank you, I look forward to enjoying the amp for years to come. I am even more impressed with my Optidrive 1000.1D. For a amp rated at 1000 watts it outperformed every bass amp that I had which includes an Atomic AT 1600.1D, Sundown SAZ 1500D, RF T1500-1D, MTX TA 7801D, Exonic EXA 3000DX, Crossfire VR 1000D and Crossfire XP 1400D. The only amp that it rivaled was the RF T10001BD. The Optidrive 1000.1D is an aboslutely incredible amp. I got the other one from the same buyer for only $200 and it came with the box, instructions, original packaging, warranty instructions, etc.

At this point from here on in I am sticking with ZED audio. ZED is the only link with old school American made amplifiers. He over designs his amps and they all have a very distinctive sound to them.

Good to see another ZED fan on here. What all do you have installed? And what else do you have that is zed built?