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Amps suddenly stopped working in stereo but still work in bridged.

I've got 4 Accusonic/Show amps (2 x PSA-3900, 2 x PSA-31500), all four of them were working in all modes (stereo, bridged, parallel/mono). The following day I was testing them out and all of a sudden all four amps only work in bridged mode but not stereo mode or parallel/mono mode. Has anyone ever seen or heard of this before? I'm testing each one on their own so it shouldn't be a power supply/voltage drop issue. The only thing the four of them had in common is that they were all plugged into the same power bar running through a DBX Driverack PA2.

Live sound: 4x 5KW amplifier from Linea Research

Linea Research have released the latest and most powerful member of their 44M family: the 44M20. This has the mind-boggling specs of four 5KW power amplifiers in one 2U 13Kg chassis, designed for touring companies where subs have to be powered and fed independently from the mids/tops. Its main input is rated to work from 85V to 250V, although by my quick calculations the mains current draw at 85V would have be around 250A for all channels at maximum output.

Recording from Amplifier to Zoom H5

I'm filming a conference in Oslo next month, and I've just been given some photos of their sound system. I can get more on request. I am not familiar with this type of system at all. I have a Zoom H5 I would like to record to.

Both the receiver and the amp have line out...which should I use?

What XLR (or other) cable do I need? Male to Male?

How will I know if it's a line signal or a mic signal? How much should I pad my H5?

Listening Test! please take a few mins to participate in some research on amplifier recording :)

Hi all,

I'm reaching out to the community here, and hoping that you guys might spare 12 minutes of your time to help me with a little academic research in music production, and give your ears a fun little challenge too!

Basically, I'm doing an investigation into microphone configuration for guitar amp recording, and there's a listening test followed by a short questionnaire. If you're interested, please follow the link and all will be explained!

Headphone Amplifier for vocal booth control question.

I did some searching around and didn't seem to find a specific post on this, or if there is, I have found it impossible to find.

Anyways, I have just spent a fortune working on a new studio. I am as much as a newbie as I can get. However, being in the studio many times with my previous band including the machine shop with producer Gene 'Machine' Freeman for a month I have seen a bunch to start building my own studio.

Blown Speaker and/or Amplifier Symptoms?

Does anyone want to list the symptoms of a blown speaker (or malfunctioning amp)? Obviously, distorted crackle may top the list for a speaker, but can they do other things? I have an active FOH speaker that suddenly decided to be much quieter than the other two. It is flown at around 20ft and not very accessible so it wasn't just turned down. The FOH mixer runs stereo into a Peavey DSP and then splits into 3 balanced mono output channels to the FOH speakers. Suddenly the right speaker went very quiet while the left and center remained good.

Can an amplifier be used as a preamp and plugged into a mixer?


While I'm fairly comfortable on the playing end of things, I know nothing at all about recording. I was given a BOSS BR-900CD as a gift, and am attempting to make some use of it right now. I also got a Fishman Loudbox Mini (acoustic amplifier) for Christmas, and it has an external speaker jack.

My question:


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