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Old 29th August 2013, 01:21 PM   #21
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But if the graph is offset by 20 dB to fit the scale this should be subtracted from the curve
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Old 29th August 2013, 01:52 PM   #22
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I see the distortion as highest at 70Hz, being approximately -9dB. But that graph looks like a plain baffle measurement of the driver, not the driver in a box. Or maybe a small, sealed box.
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Old 29th August 2013, 03:56 PM   #23
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Ergo gaetan8888 would need to measure distortion of his box at the SPL he is doing the test.
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Old 29th August 2013, 06:58 PM   #24
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Too true, requires reality check
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Old 29th August 2013, 10:11 PM   #25
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Yes, it would be best to see measurements of the driver in a box.
But don't forget that there are two separate issues here:
  1. Can you hear the direction of a pure tone below a certain frequency? (no distortion)
  2. Can you hear the location of the typical subwoofer low passed below a certain frequency with its attendant normal distortion?
I think item number 2 is the more important, as that's what we will encounter in real usage.
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Old 29th August 2013, 10:43 PM   #26
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The dark black line is phase, guys. It says it's a 10L box.
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Old 29th August 2013, 11:34 PM   #27
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Wasn't the line I was comparing to.
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Old 2nd September 2013, 02:41 AM   #28
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Quote:
Originally Posted by dumptruck View Post
It says it's a 10L box.
So it does! Thanks for that.

Quote:
Originally Posted by Pano View Post
...maybe a small, sealed box.
Yep. 10L is small.
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Old 2nd September 2013, 03:31 AM   #29
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0.5% distortion at 10hz? I want that speaker!!! (BTW I wouldn't be able to hear it anyway)
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