Hey all, just installed a Behringer ZMX8210 3-zone mixer for a house of worship client. Not much music, mostly speaking, so quality isn't huge issue and they need different zones for a multi-purpose room. Zone 1 is one side of a big room with a partition closed, Zone 2 the other side of the room with partition closed and Zone 3 is partition open and both rooms. Simple enough. Speakers area all JBL Control ceiling running at 70v. Have a Crown CTS 600. When I finished install this week and turned it all on everything worked great. Used mics on all jacks and an Ipod. Came in 2 days later and checked again before first event in there and all the sudden all channels sound crappy (distorted and little volume). Amp is clipping badly even with input almost all the way down. Amp also starts revving when I talk in mic for more than a few seconds. I replaced the amp thinking it might be bad, but next one did the same thing, which leads me to believe it has something to do with mixer. Only other thing in chain is a DBX 2 channel EQ but I replaced that also with a DBX Drive Rack. Same results. Does any one have any idea 1) why is this happening and how do I fix it and 2. why did it work for several hours initially and then crash? Oh, I had another mixer (same model) and replaced that as well and same thing. Any thoughts would be helpful. Thanks.
Problems with Zone mixer
- Thread starter Philip Langlais
- Start date
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Re: Problems with Zone mixer
How did you wire the 3 zones? Is zone 3 completely separate from the other 2, or is it using some of the same speakers/amps?
How did you wire the 3 zones? Is zone 3 completely separate from the other 2, or is it using some of the same speakers/amps?
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Re: Problems with Zone mixer
Zone 3 is separate with a cts1200 amp. All 3 zones are wired from amp to a post and then jumped to each speaker output. Like I said, it worked for awhile. When I returned 2 days later it did not and I don't know what changed. The only variable that I did not change was the mixer. Actually I did change that too, but the same model just in case the mixer was bad.
Zone 3 is separate with a cts1200 amp. All 3 zones are wired from amp to a post and then jumped to each speaker output. Like I said, it worked for awhile. When I returned 2 days later it did not and I don't know what changed. The only variable that I did not change was the mixer. Actually I did change that too, but the same model just in case the mixer was bad.
Re: Problems with Zone mixer
I'm thinking the mixer itself is coming out way too hot. Read swim comments online about that model and some were saying they had to put attenuators in line on each output. I can do that but I'm trying to figure out why it worked and then later did not. And I can't believe that a mixer would come out that got brand new right out of the box to the point where the amp is clipping like that.
I'm thinking the mixer itself is coming out way too hot. Read swim comments online about that model and some were saying they had to put attenuators in line on each output. I can do that but I'm trying to figure out why it worked and then later did not. And I can't believe that a mixer would come out that got brand new right out of the box to the point where the amp is clipping like that.
Re: Problems with Zone mixer
Thanks for any insight. Have to get this working by tomorrow evening. Philip Langlais.
Thanks for any insight. Have to get this working by tomorrow evening. Philip Langlais.
Re: Problems with Zone mixer
What happens if you disconnect the output wiring from the amplifiers? Aside from the obvious no sound at the speakers?
What happens if you disconnect the output wiring from the amplifiers? Aside from the obvious no sound at the speakers?
Craig Hauber
Sophomore
Re: Problems with Zone mixer
Short in a speaker line somewhere.
Rather elementary if clip indicator comes on at any volume and fan revs up for no real reason.
Check your speaker line impedances.
Unplug from amp output when it is doing the problem and see if clip light goes away and fan ramps down. Then test with a loose 70V speaker locally to make sure amp is still good.
Short in a speaker line somewhere.
Rather elementary if clip indicator comes on at any volume and fan revs up for no real reason.
Check your speaker line impedances.
Unplug from amp output when it is doing the problem and see if clip light goes away and fan ramps down. Then test with a loose 70V speaker locally to make sure amp is still good.