Question about Behringer Pmp3000 16 Channel Audio Mixer

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I have a beringer 5000 mixer and can not get no sound from it. it's like the speakers are not getting power

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Oh, oh... got one on the bench now... There is a design defect that causes a short and destruction in the power amp portion.

Do a test: Plug headphones into the main 1/4 inch jacks. The sound won;t be very loud since these are line outputs, not for headphones.

IF you get sound out those, then one or both power amps are dead.

Worst case: if one amp is dead, several parts including three power MOSFET transistors are fried for any of the dead channels.
The failure of the amp can wipe out the main power supply. If you effect windows light up, then the small power supply is operating.
If the big supply is fried, there are two large MOSFET switching transistors that are gone. Often several smaller transistors and dides and resistors and one switching IC goes. MOST of these are surface mounted parts and would be beyond the scope of what you can repair.

I am trying to contact Behringer about the flaw but haven't heard back yet.

The nature of the flaw is this: The is insufficient clearance on an internal circuit layer from the edge that fits into a slot in the power amp heatsink. Any humidity that enters can cause the insulation to breakdown and arc to the heatsink causing a chain reaction.
I repaired one of these already before finding the cause, but this one had a smoking gun! I just yesterday milled out the slot deeper and wider and will put insulating tape to prevent further arcing. The arcing that had occured burned away the internal layer and the connections. I will replace thoose with hardwire.

Repair of this problem is time consuming to weed out all the blown parts and to safely bring the unit back to life.

The current unit I am working on took out ONLY the power amp. A 30 milliohm resistor went up in smoke making a real mess. All three power MOSFETS are gonzo and a zener as well... don't know what else I will find. The previous unit was worse as the power supply was wiped as well.

Posted on Feb 07, 2010

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Posted on Jan 02, 2017

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Shud i get an external equaliser? i'm using MG166CX 16-Channel Mixer as the main mixer.


An external equalizer will not help this at all. The problem is likely within the amp (feeding the main speakers), the connections from the board to the amp, or the speakers themselves. In other words, the answer would be "NO." Best of luck!

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Your studio should have proper sound deadening on the walls ceiling and floor. There is a lot of information on the web about setting up a studio. Search for it with google. The more studio-like the environment, the more like pro sound you will get. You will NOT get pro-sound in a bare garage or a room in a house without handling the sound reflections in the room. These mics hear EVERYTHING... they are a high quality mic.

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If you wish to use another mixer as well as the channels in this, I suggest you run the other mixer into one of the stereo channel inputs OR the CD inputs, although the CD are NOT balanced inouts and subject to higher noise level.

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This is a STUDIO mic and CANNOT be used in the presence of speakers that are driven from its output.

There is special hardware processors to cancel feedback but you do NOT want to go there !!!

This condenser mic is to be used in a studio where performers wear earphones and NO monitors are present.

You should use a Shure SM58 or other CLOSE talking cardoids if you have speakers in the area.

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Yes, the fan is temperature controlled. You have to drive it a bit before it runs, and then it is kind of throttled versus temperature.

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You don't specify which model Phonic mixer in question.
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