Has anybody bought or heard a Chinese knock off amplifier?

even worse.

I recently mounted two chinese 500 watt class d modules for 20€ each into a frame of a quad 405 frame to replace the old, unstable existing modules that killed my tweeters by wildly oscillating and I had to state: the 405 NEVER BEFORE played that well. amazing power, transparent and clear treble and all that at with incredible dynamics.

People that produce counterfeit anything are thieves. It's no more complicated than that. People that buy things from thieves are either ignorant, or amoral.

Before buying Chinese, you should learn a bit about what your money will be contributing to. And yes, it is a question of the world you want to live in. It's easy to find things to knock in any nation, the US included, and being at the top, we take more than our share of criticism. But attempt to find out a bit about how the world might change with the Chinese government at the top, which is a very real and looming possibility. Really, have a look. It will probably scare the sh*t out of you. It's what North Korea can only aspire to.

https://www.youtube.com/watch?v=wM1DjkPWtj0

For decades I’ve read/heard disparaging comments about electronics made in S Korea. In college (1981) I bought a Sherwood S9600 CP receiver. Designed in the USA, manufactured and assembled in S Korea. 

Here it is 40 years later and I still use that receiver with no issues. Replaced a power switch. That’s it! It’s been in daily use for 40 years. Moved 14 times, even overseas. 

Im not supporting a communist regime in buying it. Denied Japan some money. But I feel good about it.

i can’t feel good about supporting the PRC and the CCP! Their stated aim and business practice is to take over all industry and control from non-communist countries. When you buy from them, you add a strand to the noose designed to hang western countries and economies.