You drive it hard into large power resistors, and watch the output on the Scope and see if DC gets superimposed on the output. I bet that is the problem. I have been there. DC offset is the only time I have burnt out woofer voice coils. I have to admit to burning out the odd tweeter, may be a couple, from over enthusiastic levels.\n\nThis problem only started with the introduction of direct coupled output stages. One of the first was the Crown DC 300 A. I also had a very early Quad 405, send a speaker up in smoke. Peter Walker apologized and sent me the clamp circuit for the output. He also gave me new boards, as the output transistors were promptly discontinued, and so that led to the prompt new iteration of the power amp boards.\n\nI would have enormous suspicion of that Emotiva amp. Ascend will probably not be so kind to you if you fry more VCs!\n\nAscend call that mid range driver, a mid woofer. So I suspect that the speaker is really a 2.5 way, with the cross to mid being acoustic. That is actually I good plan. But that would mean that there would be no cap in series with the midrange. That is actually quite a good design. You might check with Ascend to see if that is correct and if there is a cap in series with that mid or not. If there is no cap, DC offset is likely. If there is a cap, it was not DC offset. Since they call it a mid woofer, I suspect there is no cap in series with the VC.\n\n\nWill send a note to Dave and get his confirmation, and to Emotiva as well.\n\nIn terms of Ascend being "kind" ... well, they were nice and all, but I had to pay for the two woofers... so I'm sure they'll keep selling me additional woofers if the problem persists (not implying they should've covered it under warranty if culprit was amp).