My first powered MAS 1/8 had an issue with the power amp. I sent it up to Mike immediately, but when he got it the issue had totally disappeared. There were no issues with the powered cabinet. He banged it around for several
days trying to get the power amp to fail, it never did. So, he replaced the power amp with a new one. I've had absolutely no issues with the cabinet since. So who knows. Just a aside here, I totally believe that others
have had repair issues and no doubt they were a real problem that said, even with the best quality control in the world, think AI, or EA there are issues with units because no production will get you above a 5% failure
rate. It's not possible Ampeg had issues with the PF 500's and Loud Technology is a huge company with all kinds of quality control in place. Just my take.