I bought an Ampeg SVT410 HLF about 2 years ago and has been giving me nothing but grief. Speakers were being blown out at a rate of one every two months, after the third time I took it to a tech and he told me the factory wired it all wrong and fixed it. Then it happened again and I was told it must be the head because it's an old 400RB that may have worn transmitters, not worth fixing. So I went out and got a brand new 700 RB, and another speaker. I just came back from tour and the club had poor electricity and had a black out. When the power came back on, I had nothing. The head works fine(tried it on the other band's amp) . But the cabinet has ZERO power. Has this happened to anyone? I'm seriously ready to throw this cabinet off a cliff, and for the amount of $$ I put into it, I could have had another cabinet by now. Any suggestions?