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| Date: |
March 25, 2005 at 13:59:36 |
| From: |
Pete Schumacher, [commons10k1.mo24.107.56.72.charter-stl.com] |
| Subject: |
Re: Basic - High end sub, considering sealed dual small drivers... |
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Clipping in a sub comes from two causes. One is due to the drive amplifier reaching the rails, the other is the driver itself reaching it's linear limits. Electronics can be built to limit clipping, but unless you know exactly where the driver reaches Xmax, you don't know when you're sending too much power, clipped or not.
For example, the Scanspeak 10, in a 1.5 cubic foot box, will reach xmax at 20Hz with only 59W. At 30Hz, it will be at xmax at 100W, at 40Hz, 200W. Max SPL at 20Hz is 90dB before xmax is exceeded (rapidly rising distortion above that). The DPL12 for comparison, in a 2.4 cubic foot box will handle 150W at 20Hz for 97.5dB before xmax is reached. That a HUGE difference! In fact, you can't get the same SPL from TWO of the scanspeak 10's. $150 DPL bests $750 Scanspeak. Seems like an open and shut case to me.
Eq'ing a sub can be done. Some amps have rather nice controls to do that.
I have a Class-D sub amp (RC Akustic, Germany) that has adjustments for boost level 3dB or 6dB increments, boost frequencies, 20 to 45 Hz in 5Hz increments. Something like that could be used to tailor the cutoff point for room characteristics quite nicely. I don't think my amp is an exception to the rule these days either. I run mine flat without a rumble filter since my sub is tuned to 15Hz.
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