I play my ported front mains full range without my subwoofer fairly often. My fronts are rated -3 dB at 32 hz anechoic. I wonder if there is any wasted power going to these speakers somewhere in the bottom octave of 16-32hz? Would there be any use to me in using a subsonic filter of some kind, say below 20 hz to remove some of the bottom most octave that might be sucking amp power for no good reason? Or does the steep slope of the ported design avoid wasted power? What I imagine is that the amp and speaker are voicing the bottom octave, even though its a few dB below the frequency response and not heard, thereby wasting power.