Other than peak power output, is there any appreciable difference in sound quality between the REL Q150 and the older Storm? The rated frequency range of the Storm is one hz lower, at 18 hz, than the Q150's 19hz, and the Storm is of course rated at only 100w RMS into 8 ohms vs. the Q150's 150w. But given moderate average playing volume from Sonus Faber Concerto mains driven by a Quad 909 amp (rated at 140w into 8 ohms), neither sub would be put anywhere close to its maximum rated output. So I don't know that the difference in sub peak output really matters. Given the choice at equivalent price, for my amp and speakers, which of these two REL products would you prefer?