Well I have a pair of 10 inch Xenon's in my trunk now in a sealed box and I have to say they are rather amazing. They are currently underpoweredm getting maybe 130-150 watts each because I am yet to get a bigger amp. They can take up to I believe 700+ watts each. 600 is the magic number so my pro. installer says so. They sound great even underpowered, look really great, and the LED is a nice touch and doesn't look cheesy at all. In comparison to what I have used before, they are better I believe than both MTX and Kicker in terms of quality. They were definitely meant for a sealed box as well. But, I do not doubt they would perform in a ported or SPL setup simply because I have heard them getting nominal wattage and they make a LOT of noise for a sealed setup if you tune for such.