This problem is related to my PA powered mixer and my main PA speakers but I was hoping the geniuses of talkbass could help me out. I've got a Samson 500watt powered mixer, with two separate 250w 4ohm channels. When I first got it I didn't have big speakers so I was running both speakers with one of the channels (splitting the 250w). When I finally did get the bigger speakers the other channel of my amp was not working at all....... blah. So for awhile I used the single channel for the bigger speakers and all was working fine, just quiet. Eventually I had the money to get it repaired, and I was then able to run both the speakers on their own channel with 250w going into each. The speakers are SoundTech ST15R which are 15" woofers with a horn. They are 8ohm 300w RMS, 600 program. Now here's the problem. At one show I was running sound at one of the horns went out. Ok, I though, must be cheaply made speakers (even though they're about $900 for the pair... I got a great deal on ebay). I went to plug them in the next day to figure out which one needed to be fixed, and now BOTH horns are gone. I couldn't understand what happened, but they are under warrantee for the next 3 years, so they'll be taken care of. Is this all happening because I'm running them with a 4ohm mixer? I thought it could work that way, just not the other way (like putting a 2ohm load on a 4ohm amp would be bad, obviously). Do I need to just get a new power amp with 8ohm out? Thanks for any help anyone can provide. It is certainly appreciated.