Help-sibilance!


Auditioning some Newform 645's which I love. However, as they have broken in, I have begun to notice quite a bit of sibilance which is driving me crazy. It is especially bad with my digital cable, but I first noticed it on Lyle Lovett's new CD which is a great recording. Any comments on what is causing the problem and potential cures would be most appreciated. System: Rotel 991, Rogue 66, MSB Link DAC, Newform R645's and Maggie 1.6's. Thanks, Mike
zenaudio

Showing 1 response by timvis

Following is an excerpt from the site: http://www.hometheaterhifi.com/volume_1_1/v1n1amps.html I suggest reading the whole section on negative feedback. Perhaps you are getting excesive sibilance because of the amp, not the speakers... """" Negative feedback is the process of taking a portion of the output, electrically inverting it, and then feeding it back to the input. The purpose of negative feedback is to flatten the frequency response, reduce harmonic distortion, lower the output impedance, and also to reduce the effects of "parasitic oscillation" that can occur when parts of the circuitry cause an induced current to flow in other circuits where it is not wanted. However, too much negative feedback can sometimes be used to produce an artificially low harmonic distortion specification. Second order harmonics will be reduced, but fifth order harmonics will increase, and this odd ordered distortion is much more noticeable than the original second order distortion. A tell tale sign of too much negative feedback is an excess of sibilance in the human voice (the "s" is exaggerated)."