sound like a great amp to me and is lanzar opti made chinaSomewhere I have a PDF saved of the test report. It was 1962w at 1/2 ohm. There was an efficiency listed of 84% IIRC, but I assume that was at 4 ohms.
The one I had was made in Korea I'm pretty sure.sound like a great amp to me and is lanzar opti made china