What It Is: The Model 755 is an electronic signal processor designed to reduce, or eliminate Audio Feedback in a Public Address System. It is in fact a frequency shifter capable of continuously shifting the frequency of all signals passing through it, by as much as 6Hz. This shift is not typically audible unless it is compared to the original signal. What It Is Not: The Model 755 is not a Filter, and is therefore unlike most Feedback Suppressors, which rely on one or more "notch" filters to attenuate a specific frequency, or frequencies. Although this approach can be effective, it is not without some serious tradeoffs. For example notch filters cause considerable phase shift to the signal in their pass-band and this is a form of distortion. Of further consequence is the situation which occurs when the System Resonant Frequency is within the vocal spectrum. In this instance, setting the notch filters to frequencies required to prevent feedback, will actually result in attenuation of the voice your are attempting to amplify, thus defeating the very purpose of the PA System!

• Low Noise Circuitry
• Phase Accurate
• Continuous Shifting, Zero Response Time
• Proven, Patented, Warranted

Low Noise CircuitryPolyfusion Electronics