Members Gary in NJ Posted September 15, 2008 Members Share Posted September 15, 2008 A strange thing happened at a gig Friday night. My monitor, a Yamaha SM12III, started to distort as if it was loosing power, and after a slow "fizzle" it went silent. Oh well, I figured, must need a new woofer (it doesn't use a cross-over as it has a piezo horn). The stage volume was "normal" for us, which is very low. The Yamaha was the first speaker in a two speaker chain. I'm about 97.3% sure that the speaker next to it was functioning. I did check the Status LED's on the amp (Mackie M1400i) to see if it was having a problem (Protect, Short, Temp), but all looked good. Last night I hooked up the speaker so I could trouble-shoot the problem...and the speaker worked just fine. Nice and clean even at volume settings much higher then we'd ever use on stage. Any ideas. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted September 15, 2008 CMS Author Share Posted September 15, 2008 Probably a loose connection, anywhere from the amp to the speaker. What was the wiring arrangement? Amp==>speaker===>speaker?? If so, which speaker was the one causing trouble? Link to comment Share on other sites More sharing options...
Members Gary in NJ Posted September 15, 2008 Author Members Share Posted September 15, 2008 It was Amp => Patch => Speaker (in question) => Speaker Like I said, I think the second speaker in the chain was working...ut now I'm beginning to have my doubts. I'm starting to think it was the patch panel and that the second speaker may not have been working. I've had issues in the past with having to re-insert speaker cables at my patch panel. Link to comment Share on other sites More sharing options...
Members bharat Posted September 15, 2008 Members Share Posted September 15, 2008 It was Amp => Patch => Speaker (in question) => SpeakerLike I said, I think the second speaker in the chain was working...ut now I'm beginning to have my doubts. I'm starting to think it was the patch panel and that the second speaker may not have been working. I've had issues in the past with having to re-insert speaker cables at my patch panel. may be wire on terminals of speaker inside box got loosed or input connector being loosed and gave spark. Please check Link to comment Share on other sites More sharing options...
Members agedhorse Posted September 15, 2008 Members Share Posted September 15, 2008 If you are using Speak_ons, be sure a wire didn't come loose. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted September 15, 2008 CMS Author Share Posted September 15, 2008 Andy covered my next question. It would help to have been certain whether the second speaker was working...if it was working, then the problem is isolated to the first speaker between the input jack and the driver VC that cut out. If the second speaker was not working the problem would be anywhere from the amp to (and including) the input jack of the first speaker. Link to comment Share on other sites More sharing options...
Members cmgunn Posted September 15, 2008 Members Share Posted September 15, 2008 If you are using Speak_ons, be sure a wire didn't come loose. I thought only the Club Series V had Speakons??? Link to comment Share on other sites More sharing options...
Members agedhorse Posted September 15, 2008 Members Share Posted September 15, 2008 Patch panel, user upgrade? Link to comment Share on other sites More sharing options...
Members cmgunn Posted September 15, 2008 Members Share Posted September 15, 2008 Patch panel, user upgrade? Oh, I missed that. Sorry Link to comment Share on other sites More sharing options...
Members Gary in NJ Posted September 15, 2008 Author Members Share Posted September 15, 2008 Patch panel, user upgrade? Unfortunately, when I built my patch panel, I used 1/4" connections for the monitors. At this point I realize that I don't have enough useful data. Until I can recreate the problem (hopefully at a rehearsal rather then a gig), I think I will remove the driver and ensure that all connections are secure. Link to comment Share on other sites More sharing options...
Members Unalaska Posted September 15, 2008 Members Share Posted September 15, 2008 1/4 speaker connections can be problematic on a patch panel. You have to be SURE that the ground from the amp isn't connected to the chassis of the jack itself, if there is more than on amp in that rack then the grounds for all the amps are tied together and amps do wierd things. Given that this is the first time it's happened it's prolly not a panel issue. My guess would be 1/4 inputs into the speaker, the plug may have come out a bit. SM12III's aren't really worth upgrading to speakons. p Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted September 15, 2008 CMS Author Share Posted September 15, 2008 1/4 speaker connections can be problematic on a patch panel. You have to be SURE that the ground from the amp isn't connected to the chassis of the jack itself, if there is more than on amp in that rack then the grounds for all the amps are tied together and amps do wierd things.Given that this is the first time it's happened it's prolly not a panel issue. My guess would be 1/4 inputs into the speaker, the plug may have come out a bit. SM12III's aren't really worth upgrading to speakons. p The solution to eliminating common grounds is to use plastic-housing jacks, or isolating bushings to mount all-metal jacks. But Speakons are the better solution all the way 'round... Link to comment Share on other sites More sharing options...
Members Gary in NJ Posted September 15, 2008 Author Members Share Posted September 15, 2008 My guess would be 1/4 inputs into the speaker, the plug may have come out a bit. p I think we have a winner here. I do remember someone accidentally kicking the monitor (it was off-stage, on the floor) in between the first and second sets as they were walking past the stage. I walked over and straightened it out. I wouldn't be surprised if the connection came loose. It could have been a lot worse then a speaker stopping. If that was the problem I could have fried the amp. Link to comment Share on other sites More sharing options...
Members TimmyP Posted September 20, 2008 Members Share Posted September 20, 2008 Speakon good. PowerCon good. Hmmmmm. http://www.padrick.net/LiveSound/RackStuff/RackStuff.htm Link to comment Share on other sites More sharing options...
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