Feedback circuitry on acoustic amp -- why?
I have a Roland AC-60 acoustic guitar amp, which I really like. One thing about it confuses me, though: it has anti-feedback circuitry. I understand why a guitar player/singer would want to suppress feedback, but why is it selectable on an amp? Why isn't it just wired in to the circuitry without the need for the user to turn it on and off? Why wouldn't I want it on all the time? Does having it on degrade the signal somehow?
- neverfoundthetime
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No idea Dennis, but that's the amp I want to get. Seems like you'd recommend it.
Many amps come with what's called "Notch Filtering, mine does an Ashdown Radiator 100w, smaller in size than your Roland." What this does is isolate a narrow band of frequencies that cause the amp to feedback (or warble) at certain pitches. This is at worst, a nice bonus, and at best a complete necessity. The more "acoustic" in character your set-up is, the more you'll be dealing with the ravages of feedback.
Chasplaya wrote:
Thanks. I understand the need for feedback circuitry -- what I don't understand is why it's selectable.Many amps come with what's called "Notch Filtering, mine does an Ashdown Radiator 100w, smaller in size than your Roland." What this does is isolate a narrow band of frequencies that cause the amp to feedback (or warble) at certain pitches. This is at worst, a nice bonus, and at best a complete necessity. The more "acoustic" in character your set-up is, the more you'll be dealing with the ravages of feedback.
Just to clarify, the anti-feedback circuit is a narrow notch filter at the feedback frequency. If it is active, it suppresses the feedback, but it also suppresses the guitar's output at that frequency.
So if you are in a situation where there is no feedback problem, disable the filter.
David
So if you are in a situation where there is no feedback problem, disable the filter.
David