<font color='#000000'>I had smoked several amps with only 2 Cerwin Vega old school D7's. Back in the 80's, these speakers were it! I put them on a Onkyo receiver and it has made it 15 years. It still rocks, for what it is. I could crank it up to a point that would shut the amp down, cut the volume down, and it would come back on. I would also, every now & then, have to re-set the tweeters. These speakers heve circuit breakers on the tweeters. So, it is possible to fry an amp with speakers. Don't ask me why, but I have done it. I have replaced the system now and don't even have to get volume out of the negative. I am SOOOOO pleased with my 1400. I think that it is better to buy a amp with a little more power than the speakers need & watch the volume. They seem to love the power, & you get the volume you want without turning the volume up to distorted levels. And also, the amp runs cooler! It looks like you have the receiver I could not afford, but should be somewhat similar internally to mine. I have not had any problems. I would hope that you can solve this without loosing the 2400. I would think that you may have an impedance problem. Just a guess, I am no pro. Also, you may want to check and be sure your polarity is correct on all speakers. I have made this mistake after many years of car and home audio connections. It can happen.
Good Luck!</font>