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Mastering speakers
On 5 Dec 2003 23:22:18 -0500, (Scott Dorsey) wrote:
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BUT, how low the driver will work depends on the resonant frequency of
the driver, or Fs. Speakers aren't really of much use too far below
the Fs, even with cabinet trickery. If you actually look at the numbers,
you'll find most pro audio drivers tend to be big and move a lot of air
but don't actually go very low. On the other hand, NHT makes a subwoofer
driver that is only 10" but has a 16 Hz Fs.... doesn't get very loud, but
it gets very, very deep and accurate.
--scott
-- But there are various servo-assisted solutions... it's like
"Vari-Fs". Philips called it MFB, "Motional Feedback" long time ago.
There, usualy capacitive sensors or accelerometers are taking the
excursion value to a servo amplifier which in turn applies a
proportional counter-power to the driver like a corrective signal.
This works quite good sometimes; I have relatively small enclosures
but they have servo-assisted bass drivers with photo-electric sensors.
While they are quite long-throw, they do have power limits at the
lowest frequencies; I wouldn't let them go into a club. But they tell
me lot about low life; I can practically see leakages, foot-tapping,
rumble, even phono arm resonances sometimes.
Edi Zubovic, Crikvenica, Croatia
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