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low frequencies missing from curve 1 month 1 hour ago #61276

  • scr3cscr3c
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I'm brand new to REW and minidsp and am looking for some help with 2 subwoofer integration.  I'm still stuck on trying to measure a sweep on the first subwoofer. I had to turn the gain dial on my sub about 75% to the max just to get 75 db with pink noise.  I'm not getting any output below about 60 Hz, so I assume I'm doing something wrong.  The microphone is about 6-7 feet from the sub.  My room isn't very big, and it partially opens up in the back to a much larger part of the basement.  I've watched tutorial videos by Home Theater Gamer and Home Theater Guru and tried to replicate the settings they're using in REW and minidsp.

When I was just running Audyssey, and then generating test tones separately, I've heard my subs generate frequencies down to about 20-25 Hz in this room pretty well.

Equipment:
minidsp 2x4HD
Umik-1
Marantz receiver with Audyssey XT32 turned off, speakers set to small, crossovers set at 250, in stereo mode
Front 3 speakers pre-out to an external amp (external amp turned off currently because some sound was still coming through the L/R speakers)
Two subs: SVS SB2000 and SVS SB12NSD, both go down to about 19 Hz

Thanks for your help!
 
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low frequencies missing from curve 4 weeks 2 days ago #61284

  • Ultrasonic
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It looks like you might have a high-pass filter applied to the subwoofer output? Check what's set in the 2x4 HD plugin.

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low frequencies missing from curve 4 weeks 2 days ago #61285

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Marantz receiver with Audyssey XT32 turned off, speakers set to small, crossovers set at 250, in stereo mode
 

Just spotted this part. 250 Hz sounds crazy high! Trying to have your subs cover up to this frequency will not sound good.

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low frequencies missing from curve 3 weeks 3 days ago #61369

  • JohnPM
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This got solved in the AVNirvana REW forum , but for reference:

That is likely to be due to noise cancellation processing, which Windows tends to apply be default to any mic input that provides stereo data (assuming that one channel is signal and the other is background noise). Make sure enhancements are not enabled on the Windows audio input properties Advanced tab (System - Sound - Related Settings on right hand side - Sound Control Panel - Recording - select UMIK, click Properties button) or Enhancements tab. Some PCs may have a separate application with similar features, e,g, Waves MaXXAudio, HP Audio Center, myASUS.
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