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Old 2nd September 2010 | 14:17
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SNS3Guppy
 
Joined: Oct 2005
Posts: 3,218
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From: USA
Tone generators on an engine? Say again? Speaker?

A low frequency hooting or rumbling is indicative of a low grade or incipient compressor stall, but could be a number of other things, too. Did you note any changes in engine parameters?
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