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Post by chimpo on Jan 5, 2020 0:51:15 GMT -5
Feedback loopers constantly feedback the output of whatever pedals are in the loop back into the input. If the feedback is cranked up to the point of squealing can this overload the looped pedal and potentially cause damage to internal components?
Curious because I'm interested in the Death by Audio Total Sonic Annihilation and feedback loopers in general. It'd also be appreciated if anyone chips in with any experience or opinions about feedback loopers.
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Post by chimpo on Jan 8, 2020 7:15:55 GMT -5
Bumpty Bump!
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Post by Peegoo 🏁 on Jan 8, 2020 7:36:48 GMT -5
There's no danger because having pedals in series is not a voltage multiplier like the gain stages in an amp. Each pedal regulates its own output at instrument level, which is in the vicinity of 750 millivolts. All stomp-box-type effects are high-impedance so they play nicely with guitars and amps (also high-impedance devices). So the feedback looper does not multiply voltage level back at the input; all it does is add signal.
The various voltages we play with (mic, instrument, line, speaker, mains) are all best kept separate because when you send a higher voltage to a device that's not designed to handle it, like speaker voltage into a stomp box, that's when sparks fly and the magic smoke escapes.
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Post by chimpo on Jan 8, 2020 7:56:44 GMT -5
Awesome! Thanks Peegoo. To reinforce my understanding, what you're saying is the loop in a feedback pedal is series (loop pedal> Input to effects pedal chain> return to loop pedal)? No high voltages that could cause damage, when feedback spikes and gets out of control at what seems like large volumes has zero impact?
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Post by Peegoo 🏁 on Jan 8, 2020 8:17:23 GMT -5
Yes. It's signal feedback through the looper pedal--not the entire effects chain. The guitar (cable #1) plugs into the feedback pedal, and cable #2 is plugged into the send jack, which goes to your effects chain. The end of your effects chain has cable #3 that plugs into the return jack on the looper. Cable #4 runs from the looper's output jack to your amp.
The looping occurs within the looper pedal, controlled by a level pot (regeneration) that sends less/more signal in a circle before shooting it to the amp.
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Post by chimpo on Jan 8, 2020 8:19:11 GMT -5
Cool. Thanks.
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Post by Peegoo 🏁 on Jan 8, 2020 8:26:13 GMT -5
Perhaps the only way it could damage something would be the speaker(s).
As with any feedback situation, high-frequency feedback, left to run for extended periods, heats up a speaker's voice coil because the cone is not pumping air. Speakers in normal use inherently keep themselves cool even when playing with the amp dimed because the cone is really bouncing around in the basket. This creates airflow over the voice coil (that's why a speaker's spider is a flexible mesh--to allow air to flow through) and that prevents heat buildup.
At high frequencies a speaker cone is not moving much at all. Even at lower volume levels, heat can build up pretty quickly in the voice coil and it can cook itself until the glue fails or the coil acts like a fuse and breaks.
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Post by chimpo on Jan 8, 2020 9:10:30 GMT -5
Makes sense, and don't forget about the poor old ears. I guess care will need to be taken with the feedback knob, no big jumps. From what I've read feedbacking can have no affect to unpredictable depending on the pedal. I guess a graduated cranking of feedback in small amounts until uncontrollable feedback starts to occur is the way to go.
Based on your feedback (see what I did :-)) Peegoo, I'm going to get myself a Total Sonic Annihilation II.
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Post by Peegoo 🏁 on Jan 8, 2020 9:49:25 GMT -5
Cool! Thanks!
XOXO,
Peegoo
CEO, Total Sonic Annihilation Inc.
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Post by chimpo on Jan 8, 2020 23:18:05 GMT -5
LOL.
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