In need of help, Inconsistent levels in sweep and SPL

GriffinO

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Thread Starter
Joined
Nov 20, 2021
Messages
2
My AV System  
Preamp, Processor or Receiver
Denon 4700
Front Speakers
Klipsch RP-280
Center Channel Speaker
Klipsch RP-504c
Subwoofers
Dual Monolith 15"
When using SPL my readings will drop from 80db down to 30db with no changes in position or volume on AVR also when doing sweeps I do a volume check and I get the ok then do a sweep and volume is too low. When I check volume again it is low but after 5 to 7 checks the volume comes back.
 

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John Mulcahy

REW Author
Joined
Apr 3, 2017
Messages
5,023
Might be some form of noise cancellation processing. If you are on Windows make sure enhancements are not enabled on the audio input properties Advanced page (System - Sound - Related Settings on right hand side - Sound Control Panel - Recording - select UMIK, click Properties button).
 
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