Hello, I am new at sound reinforcement and I have a feedback destroyer and i tried to see if it works well and i am still getting the feed back.  Note I am inside of a garage with the equipment hooked up, i guess.  Should be in a larger place to see the full effect of the eliminator?

Did the definition of “headroom” change?  This article defines it as the space from above the peak level to the clipping level. In all of my sources, this is not the case. For example, in Barlett’s own textbook, he defines it as “the level difference in decibels between the normal signal level and the distortion level.”

Mistake or new definition?

Wikipedia defines “headroom” as the difference between the nominal signal value and the maximum undistorted value. This article defined “headroom” as the difference between the instantaneous peak level and the maximum undistorted value.

Suppose a signal has a nominal or average long-term signal level of -15 dB below clipping. By the Wikipedia definition, you could say that the headroom is 15 dB. In other words, peaks can be as high as 15 dB above the nominal level without distorting.

We still need a term to describe the room between the instantaneous peak level and the maximum undistorted level. This article used the term “headroom”, but that’s not the original definition of “headroom”. Syn Aud Con instructor referred to that space between peak and clip as “headroom”, and defined “peakroom” as crest factor plus headroom. “Headroom” in this sense is a new definition.

This article proposed that new definition for “headroom” but I think it just confused the matter. We need a word to define the space between a peak’s level and the clipping level. If a peak starts to clip, you could say that peak has run out of headroom.

Regardless of how “headroom” is defined, a sound system needs some reserve power so that the instantaneous signal peaks do not exceed the headroom of the system - that is, they don’t clip (unless a little clipping is desired).

Sorry to reply to the feedback comment so late… I just saw it today.

A feedback destroyer does not eliminate feedback. But sometimes it lets you get a little more volume before feedback occurs. The best feedback destroyers apply a narrow notch filter at the frequencies that are feeding back. Some units, though, apply a wide notch filter and so they change the tone quality and aren’t much help.

A garage is very feedback-prone because of all the hard reflecting surfaces. I think you’d have better results in an auditorium.

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