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Author Topic: QSC PLX Amplifier Crackle in Bridge Mode  (Read 1651 times)

Matthew Csortan

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QSC PLX Amplifier Crackle in Bridge Mode
« on: October 22, 2021, 05:30:34 PM »

I have a QSC PLX-3602 Amplifier that makes a crackling/popping sound when running in bridge mode

Doesn't happen when cold, but progressive gets louder as it warms up and is a constant sound.
No input signal is present and no input cable is connected

Build date is Aug 2015

If anyone has any experience/thoughts on the issue it would be appreciated

thanks




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Mac Kerr

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Posting Rules
« Reply #1 on: October 22, 2021, 05:43:13 PM »

I have a QSC PLX-3602 Amplifier that makes a crackling/popping sound when running in bridge mode

Please go to your profile and change the "Name" field to your real first and last name as required by the posting rules displayed in the header at the top of the section, and in the Site Rules and Suggestions in the Forum Announcements section, and on the registration page when you registered.

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Matthew Csortan

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Re: Posting Rules
« Reply #2 on: October 23, 2021, 01:28:50 AM »

Please go to your profile and change the "Name" field to your real first and last name as required by the posting rules displayed in the header at the top of the section, and in the Site Rules and Suggestions in the Forum Announcements section, and on the registration page when you registered.

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And I have found turning off the Clip Limiter makes the problem worse
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Steve-White

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Mike Caldwell

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Re: QSC PLX Amplifier Crackle in Bridge Mode
« Reply #4 on: October 23, 2021, 09:50:02 AM »

What are you powering with that in bridged mode?
You could be hearing the speaker starting to bottom out.

Are you connecting only to the two red binding post for the speaker connection?

Are you connecting only to the Ch.1 input?

Do you have the level control on Ch.2 turned all the way down?

Double check the DIP switch settings.

Steve-White

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Re: QSC PLX Amplifier Crackle in Bridge Mode
« Reply #5 on: October 23, 2021, 10:11:38 AM »

I have a QSC PLX-3602 Amplifier that makes a crackling/popping sound when running in bridge mode

Doesn't happen when cold, but progressive gets louder as it warms up and is a constant sound.

No input signal is present and no input cable is connected

Build date is Aug 2015

If anyone has any experience/thoughts on the issue it would be appreciated

thanks


Check this out Mike.  Maybe with a cable on the input (load the open input) it would quiet down.  Sounds suspect.  I'm thinking it's time to contact tech support.
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Mike Caldwell

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Re: QSC PLX Amplifier Crackle in Bridge Mode
« Reply #6 on: October 23, 2021, 10:17:26 AM »

Check this out Mike.  Maybe with a cable on the input (load the open input) it would quiet down.  Sounds suspect.  I'm thinking it's time to contact tech support.

I guess I read the original post just a little too fast!!!

Steve-White

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Re: QSC PLX Amplifier Crackle in Bridge Mode
« Reply #7 on: October 23, 2021, 10:37:21 AM »

I guess I read the original post just a little too fast!!!

It was embedded without any line spacing - easy to miss.

For the OP, try connecting an input source to the amp, even if it's turned off and see if noise is still present.  i.e. try it with the input shunted.  In rare cases open inputs can be noisy - that's a long shot though.  Bridging switch contacts could be dirty.

Amp probably needs a trip to a service bench.

When an amp starts acting squirrely it's better safe than sorry - you don't want to need it out on a job and it doesn't work properly.
« Last Edit: October 23, 2021, 11:59:40 AM by Steve-White »
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ProSoundWeb Community

Re: QSC PLX Amplifier Crackle in Bridge Mode
« Reply #7 on: October 23, 2021, 10:37:21 AM »


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