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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?

Can an active speaker be used as passive if amp dies?

This hasn't happened, however, I was wondering: Suppose I have a powered speaker, like Yamaha, QSC, etc. The amp in the speaker dies, or stops working for whatever reason. If that were to happen, could the speaker be powered via an external amp, and be used like a normal passive speaker? 

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.

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!

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.

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:

Intermittent Amplifier Crackling

I have a ten year old Samson Servo 120 amplifier that developed an faint intermittent crackling in the right channel a few months ago. Some days the crackling would be there, some days not. Recently, though, the crackling has gotten louder and more persistent, and now it seems to have spread to the left channel. The crackling only occurs when sound is run through the amplifier.