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Old 08-29-2007   #1
Join Date: Aug 2007
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Default Chirping sound from a subwoofer?

Howdy folks.

I upgraded to a Revel B12 subwoofer a couple of months back. It's an awesome subwoofer, with rich rumbling bass and a powerful, room-filling effect.

BUT I have noticed recently that is has a tendency to let out a little chirp sound when it powers up after a period of inactivity.

The B12 has an automatic mode which powers off the subwoofer when no LFE signals or crossover frequency signals of the specified range are transmitted to it. When it detects a frequency within the range it automatically switches back on and produces the required frequency. I've noticed that when it switches back on, it lets out a detectable chirp noise.

There is no mode for the sub to leave it powered on for the duration. Once you turn the power switch on, it goes into auto mode and if an LFE isn't detected after 20mins, it powers down, then back up again as required.

Revel tech support says this is normal, but it seems odd to me that a high-end subwoofer lets out a distracting bird chirp.

Anyone have similar experiences or suggestions on how to alleviate it?

I've currently got the crossover set to 120. Thanks!
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Old 08-29-2007   #2
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Default Re: Chirping sound from a subwoofer?

I had the smae problem with a Linn AV 5150 sub. Yes, a little noise on powering up is normal, but it is really annoying to me when watching a film or litening to music and reminds me of a shortcoming in my system everytime I hear it, and it sounds like it does the same to you.

I ran a line from my center channel to another of the subs inputs. If your sub and center cross over with some overlap, the sub will always get something to reproduce during MC playback and therefore always stay on.

I accomplished this as the Linn amps I was using with it were designed to be daisy chained and had multiple RCA's per channel all active. You could also put an RCA splitter (often seen with subwoofer cables...where I found mine) and then re-calibrate the center to compensate for any change in level from diluting the signal to two amps instead of one.

Hope that helps!
Ken Taraszka, MD
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Old 09-19-2007   #3
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Default Re: Chirping sound from a subwoofer?

Thanks, Kenny!
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Old 11-03-2007   #4
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Default Re: Chirping sound from a subwoofer?

I have a Revel Sub 30 and it doesn't make a sound until a signal comes to it. No hum. No "churp" sounds or anything.

I would call Revel support over this. It might need a repair.
Jerry Del Colliano
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