Your point about relative levels is well taken. Still, the typical concert grand piano, for instance, does about a 27 Hz fundamental, as I recall (and certain pianos go rather lower), and some other instruments are not far behind. If to simply low pass/pad down to <20 Hz with drivers that will take the heat, we are probably looking at a fairly serious power requirement and fairly serious distortion. But I suppose the notion of power - like everything else - is relative. A friend recently corrected my "memory" of an 8 X 515s per side stereo LF array when he told me the drivers were actually 15" McCauley units with a total of 4,000 Watts on tap; and then he told me that this "isn't much" by today's standard, and "they don't go that low".
So, I guess it's all what you're used to.
I do not know and so could not even guess if the "silicon" or the driver itself would be the weaker link in producing ULF these days. So I am fishing to see what any readers know about ULF in general and "contemporary" servo ULF in particular. If the accelerometer is not designed for music, what, if not a feedback loop, controls the long stroke of a ULF driver powered with a big AB amp or, more likely, a D or H amp? Isn't this in the end mostly a less-efficient way of attempting the same thing, ie, "control" of the woofer via its motor?
Best regards,
Paul S |
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