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Advice on a new pa system
Advice on a new pa system
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Old 23rd June 2009, 10:00 AM   #11
pinkmouse is offline pinkmouse  Europe
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Advice on a new pa system
As others have pointed out, the mixer is the heart of the matter here. I'd look at something like the Soundcraft EPM8, then see if you can pick up something like the JBL active Eons as speakers, they go S/H for silly money and are very robust and if something does go wrong, easily servicable, something you can't say for some of the more MI type products.
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Old 24th June 2009, 10:50 PM   #12
Standup Jackson is offline Standup Jackson  United States
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Well, I could live with a schematic. They don't sell these anymore, with good reason.
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Old 4th August 2009, 02:00 PM   #13
FluffyBunny is offline FluffyBunny  United Kingdom
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Did anyone manage to come up with a schematic? I have a PMH880S which is popping components and I really dont want to lose this mixer.

So, first prize of a Snickers bar to the one to come up with a link to the schematic !
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Old 12th September 2016, 02:22 PM   #14
ampman70 is offline ampman70  United States
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Default Fix the GAIN CLIP problem on Behringer PMH880S Mixer

Does anyone have a link to the Behringer Fix Standup Jackson posted a few years ago for the gain clip problem on the PHM880S Mixer?

Over the last 8 years I have had no issues but am now experiencing clipping on a few channels of the PMH880S. Is the problem just a matter cleaning of the pots? Do the Hi-Z inputs on each channel route the signal through shorting pins on the 1/4" jacks? If so this may be the clipping issue. Any help is appreciated.

Thanks, Bob
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Old 14th September 2016, 08:49 PM   #15
ampman70 is offline ampman70  United States
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Hi Enzo,

Thanks for the suggestions and links. I downloaded the schematic for the PMH880S and also looked at the PMP1280. I noticed a difference in the feedback (gain) resistors in the 1st stage in the 880S compared to the PMP1280. It's a 330K vs 100K. The PMH gain may have been a bit too much and on the later models PMP they may have decided to lower it. Although lowering these values to the 100ks may not fix my issue, it was just an observation. Also it's seems odd they decided to place the tone stack ahead of the volume control. Although I am more familiar with guitar amps than PAs.

I didn't find the 880S too difficult, but it wasn't completely disassembled.
Here's what I did:
- removed the 8 front and 7 larger rear panel screws
- pulled the chassis partially out from the rear of the plastic shell, then removed the 8 smaller rear panel screws
This allowed me to remove the front panel and inspect the 4700uF caps.

For now it wasn't required to completely disassemble it down to the power supply to test/replace FETS, but this may be the difficult part you mentioned.

I appreciate your reply and will use the forum rather than PMs. I'll try your suggestions, and let you know the results.

Thanks and best regards,
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