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I just acquired a crate pro audio pcm-8 dp+ 8 channel powered mixer and it powers up but that is all...Suggestions on where to start ??? Thankyou...

Power but nothing else...

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Ron Durham

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You trying to fix it or sell it ?

Posted on Jul 21, 2016

Testimonial: "Fix it, I have one identical that I've had for years that I use for bedroom stereo , wanted to put this one in garage... Like I said had for years with no problems..."

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My behringer pmp3000 doesn't seem to have much power to use my two peavey 12" speakers and use a mic. I have to push the gain and faders up more than I think I should have to, to get a decent level of...


Where do you have the gain control set on the Mic channel ?
If you have no issues with either the speakers or the Mic, and the gain control for the channel you have the Mic plugged into is set at a somewhat "normal" position, you might have a problem with the mixer itself.

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Behringer mixer Eurorack UB802 is losing partial stereo signal in one channel. When I record (audacity software) I can hear both channels but displays one channel. Is it my computer's audio jack t


Sounds like the output cable from the 802 is not correctly pinned to your input on the computer. Fred is on the right track but you may need to take it a bit further.
It may also be helpful to use a Pro USB audio interface such as the Digigram UAX220v2 (line level version).
If you wish to use the computer's on board sound card consider an IHF/Pro interface that converts balanced audio to unbalanced , and the proper cables. Two 3-wire balanced 1/4-inch from the 802 to the left and right inputs of the interface (XLR Male), then RCA (Red and White) to a 1/8-inch TRS Plug cable onto the the computers audio input.
Henry Engineering's Matchbox HD comes to mind.
Good Luck.

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1 Answer

Need schematic for Crate PCM-8 DP+


Without a schematic you can still trace the circuit to locate the fault.

Put a music source or sound source into the bad channel and a good channel, and with an oscilloscope or with a pair of high impedance headphones with test leads on the ends- you can set up a low z headphone with an impedance match trasformer, make sure you have test prod ends on one of the leads. The other can go to a chassis ground. Start at the input and work your way forward comparing the signal between the good channel and the faulty channel. When you lose the signal or you encounter severe distortion, you are in the vicinity of the defective part.

Common failures are a Deffective 4558 or TL072/TL071/TL074 IC chip. You may have a faulty electrolytic capacitor, or even a faulty bypass caoacitor in general. Bad solder connections, even a broken fim resistor.

With the IC chips, the usual power pins for an 8 pin plastic or ceamic DIP are pins 4 and 8. usual outputs for the 8 pin are 1 and 7 the remaining pins are the inverting and noninverting inputs. 2 and 3 and 5 and 6.

Also check switches and especially those with interupts on the input and output jacks- they can get dirty.

Apr 10, 2012 | Music

2 Answers

We are trying to purchase a pmp mixer for our church choir. What's the difference between the pmp 3000 and the pmp 4000? Thanks!


The answer is "Not Much"... they upped the rating for power out and added 1000 to the model number... I don't know of any circuitry difference between them... it would probably be minor. Functionality is the same.

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1 Answer

Hope you guys can help... I have a laptop Karaoke system. I connect from laptop to 6 channel mixer to speakers. I use a stereo phono to RCA from laptop to mixer. I am experiencing a buzz coming through...


Yep! Get a decent audio interface that attaches to the PC with a USB connection and uses BALANCED lines to your mixer. I use a UA-25EX Roland/cakewalk as an example. (about $200 and there are cheaper units such as M-Audio Fast Track MKII ) Note these interfaces BOTH record and playback with two channels for stereo.
Essentially the audio board that is in PC's and Laptops are too near the switching noise of the processor and some of that is just bound to get into the audio lines as they don't even have balanced audio lines from the computers. Make sure you use either TRS or XLR balanced cables from whatever interface you get. Also connect ALL interconnected equipment to the same power source or receptacle. You can try to reduce the buzz with the mixer EQ's with what you have, but that sacrifices audio quality.

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1 Answer

Crate pa6fx powered mixer, powers on but when I hook speakers up to them, hear loud hissing and pops out of one of the speakers, nothing out of the other. I can hook up a mic and hear myself through the...


It is likely that there is a failure of one of the amps in the unit. It could be a cracked circuit board, bad solder, bad volume control, or a bad compnent in the power amp section for one side. HOWEVER something does NOT compute here as you can't connect more than one speaker to a 15 Watt Crate amp... Maybe you have two of these amps.

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My behringer pmp 3000 has litle power i thing is 3000 or how much power it haveit? I put 2 speaker only ,,,, thankyou


The unit should drive 400 Watts RMS into a 4 ohm load per side.

The amount of sound power you get will VASTLY depend on speaker efficiency. You would likely use at least 15 inch speakers with the unit.

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Peavey XR800F 8 channel - I can't get but very little sound to my big speakers. Help


Troubleshooting is always a "process of elimination." Have you tried hooking up your Peavey powered mixer to another set of speakers? How about connecting the speakers to another audio system? Your term "very little sound" could mean audio input problems, mixer/amp settings or failure and possibly speaker damage (internal passive crossovers). Please be more specific.

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