Okay, I read every posting in the archives about the 215D BW cabinet. It should be 4 ohms with 2 8 ohm Black Widow speakers wired in parallel. My question is, if all this is true for my 215, would using a Carvin B1500 head be too much for that cabinet? I have the deeper 18 inch version cabinet, incidently with aluminum coned speakers. How much volume and power can these speakers handle without blowing? Is there an optimal amount of power these were designed for?