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Author Topic: Bellowing noise when amp is powered up  (Read 1446 times)

Mike Caldwell

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Re: Bellowing noise when amp is powered up
« Reply #10 on: October 12, 2020, 11:14:10 pm »

It maybe worth trying a firmware update / reload.

Don T. Williams

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Re: Bellowing noise when amp is powered up
« Reply #11 on: October 13, 2020, 04:52:29 pm »

I'm wondering if it just sat so long that the relay contacts might have been dirty and allowed a signal to the amp output that would normally short to ground when powered off.  I am assuming this amp has such a relay and circuit, and I don't know that. It's a model I haven't used or sold. I know this isn't an old product, but it seems a lot of the older amps from the 70's and 80's made funny (or scary) sounds when powered down and connected to speakers back in those days. I may be thinking about Phase Linears' or other less than pro product.  Sorry about the earlier attempt at humor.
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Steve Crump

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Re: Bellowing noise when amp is powered up
« Reply #12 on: October 13, 2020, 06:06:09 pm »

I'm wondering if it just sat so long that the relay contacts might have been dirty and allowed a signal to the amp output that would normally short to ground when powered off.  I am assuming this amp has such a relay and circuit, and I don't know that. It's a model I haven't used or sold. I know this isn't an old product, but it seems a lot of the older amps from the 70's and 80's made funny (or scary) sounds when powered down and connected to speakers back in those days. I may be thinking about Phase Linears' or other less than pro product.  Sorry about the earlier attempt at humor.

I am going to circle back around and work with the amp in my shop to see if it does it again. It may become a project for one of my friends.

No offense taken with the humor. Humor is much needed. I appreciate the input.
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Jared Bartimus

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Re: Bellowing noise when amp is powered up
« Reply #13 on: October 13, 2020, 07:11:13 pm »

I doubt it would have gone away on its own in this case but does the MR18 have an internal talkback mic that could have been open? 
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Steve Crump

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Re: Bellowing noise when amp is powered up
« Reply #14 on: October 15, 2020, 02:30:01 pm »

I doubt it would have gone away on its own in this case but does the MR18 have an internal talkback mic that could have been open?

Nope.

I tried again last night...everything worked fine. Gremlins in these QSC GXDs.
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Jeff Bankston

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Re: Bellowing noise when amp is powered up
« Reply #15 on: October 16, 2020, 12:25:14 am »

sounds like bull to me
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Steve Crump

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Re: Bellowing noise when amp is powered up
« Reply #16 on: October 16, 2020, 10:01:45 am »

sounds like bull to me

Well it happened and I was hoping by posting it here someone would come along with the same experience and give me some insight on what the issue may have been. I am guessing by your post you have not had this issue.  But as always thank you for your insightful input.
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Tim McCulloch

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Re: Bellowing noise when amp is powered up
« Reply #17 on: October 16, 2020, 08:01:34 pm »

Well it happened and I was hoping by posting it here someone would come along with the same experience and give me some insight on what the issue may have been. I am guessing by your post you have not had this issue.  But as always thank you for your insightful input.

It's the "bellowing".  Jeff thinks visually.
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Steve Crump

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Re: Bellowing noise when amp is powered up
« Reply #18 on: October 16, 2020, 08:20:15 pm »

It's the "bellowing".  Jeff thinks visually.


I really didn’t know how else to describe the sound. I guess I could have chosen a better description, but words are definitely not my gift. Should have asked my wife for a descriptive word, she was in the shop when it happened.

Thanks

Edit. Okay. I am “thick”, I completely missed the pun! And I consider myself to have a good sense of humor. My apologies.
« Last Edit: October 16, 2020, 08:26:16 pm by Steve Crump »
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ProSoundWeb Community

Re: Bellowing noise when amp is powered up
« Reply #18 on: October 16, 2020, 08:20:15 pm »


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