Members CFC Posted January 26, 2012 Members Share Posted January 26, 2012 Ok if anyone can help it would be great! we have used our pa a lot but mostly with just vocals and a bit of kick drum.we have a bigger set up and rigged it up last night to have everything going through it. we have a Peavey XR 1220 powered desk going into 2 Peavey UL 15 tops. From the sub out on the desk we go to a wharfedale power amp into 2 18" HK subs. From the monitor out we go to a powered Mackie monitor. wired it up and put some music through it and is sounded very good. started to sound check the kit. kick drum-slight almost delayed buzz after the thump Snare drum-perfect rack toms-terrible long harmonic buzz on every tom.(tried everything, could not get rid of it) hi hat,cymbals-perfect Bass guitar-buzzing Vocals-perfect All buzzing coming from tops,no buzzing from subs. tried everything,changed mics,leads,eq,checked speakers. Try the music again and now we notice a buzzing present on a track with a low keyboard intro. we try the music and the drums through the mackie monitor-perfect. I know it all points to the tops but we have checked them thoroughly and cant find anything wrong and as i said before we have had no problems with them before. sorry to be so long winded about this but we are not sound guys and i have searched for an answer online, the only thing i can find is maybe a voice coil problem.would this not be a problem with the whole sound not just the lower frequencies? cheers Mick. Link to comment Share on other sites More sharing options...
Members gspointer Posted January 26, 2012 Members Share Posted January 26, 2012 Are the speaker grills tight and have foam in good shape? ( assuming they use foam) Link to comment Share on other sites More sharing options...
Members sibyrnes Posted January 26, 2012 Members Share Posted January 26, 2012 It's sounds like your tops don't like the lower frequencies. Are you using any type of cross over or HPF(high pass filter) to keep the lows out of your top cabs? Your top has a claimed rating to 60 hz and I doubt it's really that low. If you are feeding it a full range signal that would explain why your kick and bass are "buzzing". Link to comment Share on other sites More sharing options...
Members CFC Posted January 26, 2012 Author Members Share Posted January 26, 2012 Are the speaker grills tight and have foam in good shape? ( assuming they use foam) Thanks for the reply,yeah they are in good shape,we checked everything we could get at! Link to comment Share on other sites More sharing options...
Members CFC Posted January 26, 2012 Author Members Share Posted January 26, 2012 It's sounds like your tops don't like the lower frequencies. Are you using any type of cross over or HPF(high pass filter) to keep the lows out of your top cabs? Your top has a claimed rating to 60 hz and I doubt it's really that low. If you are feeding it a full range signal that would explain why your kick and bass are "buzzing". Thanks for the reply,the desk has a built in cross over,the manual claims that its all sorted out automatically. Link to comment Share on other sites More sharing options...
Members Bobby1Note Posted January 26, 2012 Members Share Posted January 26, 2012 Does the buzzing vary with volume? Have you looked at your speaker-surrounds, for the LF driver in your tops? Are you using a HPF? Link to comment Share on other sites More sharing options...
Members Rezrover Posted January 26, 2012 Members Share Posted January 26, 2012 Thanks for the reply,the desk has a built in cross over,the manual claims that its all sorted out automatically. Looking at the manual: http://peavey.com/assets/literature/manuals/03513760_8868.pdf , it looks like the sub is the only thing the crossover applies to and your tops are still running in full range. Link to comment Share on other sites More sharing options...
Members jwlussow Posted January 26, 2012 Members Share Posted January 26, 2012 That's what I thought too. The lows are too much for your tops. You need to HPF those channels or get a real crossover. Link to comment Share on other sites More sharing options...
Members Axisplayer Posted January 26, 2012 Members Share Posted January 26, 2012 I don't think that is true from reading it. They included a warning not to select sub mode without subs because it would cut the low bass from the main speakers, and another place they mention that some boards don't cut lows from mains when using internal xovers so it seems that lows are removed from tops. The console puts out 300 RMS per channel at 8 ohms. The tops are 8 ohm cabinets with a 98 db efficiency. Thats about 123 db max. I am guessing he is pushing the console into clipping which you hear on tops and not so much on subs. Even if he still hears it at low volume, I would suspect the damage has already been done to the speaker previously and this was the result. That is not a lot of power for drums, bass, etc to be plugged into it. Really easy to have clipped it and done damage to the speakers. Link to comment Share on other sites More sharing options...
Members Rezrover Posted January 26, 2012 Members Share Posted January 26, 2012 That manual doesn't tell you a whole lot. Link to comment Share on other sites More sharing options...
Members Axisplayer Posted January 26, 2012 Members Share Posted January 26, 2012 Agree. Link to comment Share on other sites More sharing options...
Members CFC Posted January 26, 2012 Author Members Share Posted January 26, 2012 This is from the desk description- The power amps deliver 600 watts to each side in all modes, and those modes with subwoofer option have a built-in fourth-order crossover that sends all frequencies below 100 Hz to the sub. It also says that the desk has high pass filters. Link to comment Share on other sites More sharing options...
Members Axisplayer Posted January 26, 2012 Members Share Posted January 26, 2012 They say 600 watts and then call that program watts. The specs then say 500watts RMS at 4 ohms, and 300 watts RMS at 8 ohms (which is what his speakers are.) The xover does seem to properly divide so tops should not be seeing anything over 100hz. Link to comment Share on other sites More sharing options...
Members Rezrover Posted January 26, 2012 Members Share Posted January 26, 2012 On this page, it says crossover points for this & that but... You think Peavey would elaborate on how to set it up. Maybe it's in another manual? Link to comment Share on other sites More sharing options...
Members jwlussow Posted January 26, 2012 Members Share Posted January 26, 2012 All being said, I'm leaning towards Axisplayers thinking. The OP is just overdriving the speakers. Link to comment Share on other sites More sharing options...
Members DaBender Posted January 26, 2012 Members Share Posted January 26, 2012 I believe that powered mixer was one of the last things dBoomer was involved with at Peavey, and I'm certain that using the sub out option invokes a true crossover, and kudos to Peavey for making the "sub out" a truly useful option (unlike most powered mixers, which continue to send the lows to the main outputs). Link to comment Share on other sites More sharing options...
Members Rottdoggie Posted January 27, 2012 Members Share Posted January 27, 2012 We had a similar buzzing from our tops the other weekend. It was actually a physical buzzing from where the cab mated with the pole. And - like the OP described - often it kicked in after the source frequency died away...almost like a reverb. Subs were unaffected. Link to comment Share on other sites More sharing options...
Members CFC Posted January 28, 2012 Author Members Share Posted January 28, 2012 just checked the tops and they are 4 ohms so they should be at least 500 watts a side. Link to comment Share on other sites More sharing options...
Members CFC Posted January 28, 2012 Author Members Share Posted January 28, 2012 We had a similar buzzing from our tops the other weekend. It was actually a physical buzzing from where the cab mated with the pole. And - like the OP described - often it kicked in after the source frequency died away...almost like a reverb. Subs were unaffected. thanks for the reply,we removed the tops and put them on the floor but they still buzzed. Link to comment Share on other sites More sharing options...
Members Axisplayer Posted January 28, 2012 Members Share Posted January 28, 2012 I now find they are indeed available as 8 or 4 ohm. The increased wattage means you can hit max 125 db theoretically. Still sounds like remnants of damage to me. Link to comment Share on other sites More sharing options...
Members dboomer Posted January 28, 2012 Members Share Posted January 28, 2012 I'm certain that using the sub out option invokes a true crossover Correct Link to comment Share on other sites More sharing options...
Members CFC Posted February 2, 2012 Author Members Share Posted February 2, 2012 OK,speakers now repaired.voice coils were knackered.thanks to everyone for your help. Link to comment Share on other sites More sharing options...
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