. . . I tuned out of AA after a flamefest where several members, engineers in the know mind you (at least while they were online), swore that there was no need to build speakers that could play below 50hz. Apparently the physical length of the wavelengths are so long below that frequency that you would have to sit over 30 feet away to hear them. . . .
In defense of inexperienced engineers, not PJ or me, they have been taught but don't have the real world experience with the acoustic phenomenon. Experience is a great teacher. Like playing a bass test tone and walking around the room and finding spots with a suck out, null, and spots with way too much bass, the resonant spots.
It is ignorance, the lack of knowledge, in this case experience. I have smoked all kinds of friends who were engineers with the volume of 3.5 WPC, a Power Wedge that made the sound louder (lowered the noise floor), and Armorall making a CD sound noticeably better.
My lungs can hear 10 hz, just crank up the volume enough and breathing becomes impaired! 
Bwa, ha, ha, ha! I laugh a good belly laugh.
I put a sub on it's back (cone up) and hooked it to a signal generator in a stereo shop I worked at. The crossover was 100 Hz. At 100 the tone was clear but low volume, at 50 Hz it was full and firm, at 20 Hz we could have tossed salad. The glass windows were rattling in their frames, I thought one or two might jump from the frame. But you didn't really hear anything, it was tactile! My, then almost flat, belly wiggled, my lungs were being pumped. It was one of the most fun audio experiences I have had.
