I have had problems with the PT-30K. I had to send them back to China. I had to pay for shipping to China. I had to pay for shipping back from China. Yes, they were new and under warranty. I got a set back even worse than the first. I still have them. I might pickle them and feed them to my CT6800HPs
Now to be fair, they did send me a second set which look OK. Dave at LSP also helped me out, so I'm over it now and OK.
But let that be a warning to anyone thinking they can save $100 instead of buying DTs.