As some of you know I have received an RMX1450 to power my two Tempest sealed subs (230L). I guess what I want to know is how much power is required for them to reach their potential? because 450 watts doesnt seem to cut it. I've tested them with some real bass heavy material (LOTR,JP3 etc.) and seem to be able to clip the amp quite easily with that material and the subs arn't even breaking a sweat! My first thought was that I had one of the low frequency filters on but i've doubled checked many times and all filters are off. I've been thinking about getting a second RMX1450 and bridging one amp into each sub. I know it sounds crazy but I think the subs could probably handle it, not continuesly of course but for short transients I think they could, and theirs nothing wrong with having a little extra headroom! I don't even want to venture a guess at how much power would be required to drive a Tumult full out!