Let's see..... the first thing I'll hear is 'It doesn't even meet specifications' and 'Those aren't great numbers'
and 'It doesn't have flat frequency response.'
You're right. It also only weighs less than 10 pounds soaking wet and costs $239.00 delivered. If you look at the controls, you will find features that don't exist on comparable PE plate amps. The quality of assembly and components used are very good. Yeah, it's made in China and OEM'ed to OAudio but it has good quality and decent specs.
It has a soft clip circuit that reacts when a steady state sine wave (or music) is applied and brought up to full power slowly. I could crank it up quickly and watch it peak without clipping but I could not get it to run at a steady 80 Hz at full power. You could see the waveform being 'adjusted' electronically. Now, for a 500 watt plate amp, this is a good thing. You can see from the current reading in the last image that I am drawing 4.94 amps. The fuse is rated at 5 amps. (I got tired of buying fuses and just put the current meter in line to monitor the draw.)
The fact that I have heard this amp work in a well built cabinet with a great 4 ohm 15 inch driver is what I base a lot of my praise for the amplifier on. This amp was run right with sherv's old SVS Ultra and it bested that sub easily. So, even though it only gets close to meeting specs, it has some power behind it. And it's efficient. For a plate amp, this is one of the better ones. Thanks again to JoePerri who shipped this to me from California so that I could test it.