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Need PA help/ bass buzz through tweeter on PA

mcapote

mcapote

Sep 9, 2009
1,591
5
Miami Florida
#1
Ok so i got a little problem, my new band got in a new PA system last night. When i plug my GK MB210 into the system i notice my G and A off my E string cause a buzz out of the tweeter of the mains(does not buzz on my amp itself though). I tried turning off the highs on my system but it still does it. Any ideas on what I need to do to eliminate that buzz? only happens from my bass, not if i plug and ipod with heavy bass into the system.

PA system
___________
Mixer
Carvin C1648 16 Channel Mixer

Amps
Carvin HD2000 - subs
Carvin HD1500 - mains

Speakers
2 x Carvin LS2153 mains
2 x Carvin LS1801 Subwoofers

Crossover
Peavey PV-23XO
 
#3
I'm getting the same kind of thing from one specific bass - high buzz in tweets of house system...and to add to the confusion - it happens whether or not I have D.I. from amp to house...and only when I turn volume up.
 
#9
mcapote said:
ehh got a sound guy coming to practice monday to check it out. I cant figure it out. I dont see why my bass would be coming out the tweeter of the mains.
Click to expand...

Good idea provided the SG has some diagnostic skills and willing to take the time to track down and isolate the culprit. As it stands, we just don't have enough info but it's probably one of two things: equipment compromise or operator error. I have my suspicions as you're dealing with new & untried gear but to flatly assume such is foolhardy. That being said, the first thing I would do is to plug my bass into a decent DI box, run a mic cable to the mixer, and see if the anomoly (buzz) is still present. No bass amp, cab, effects...nuthin'. The results will dictate as to how to proceed.

Riis
 
#10
Zooberwerx said:
...That being said, the first thing I would do is to plug my bass into a decent DI box, run a mic cable to the mixer, and see if the anomoly (buzz) is still present...
Click to expand...

This. This will remove a good chunk of your signal chain and help isolate the problem. It will allow you determine whether your amp is the source of noise.

Also, when you say you "turned off the highs", what exactly did you do?
 
#11
Hactar said:
This. This will remove a good chunk of your signal chain and help isolate the problem. It will allow you determine whether your amp is the source of noise.

Also, when you say you "turned off the highs", what exactly did you do?
Click to expand...

on my amp and bass i turn the treble all the way off, and i cut the highs to my channel on the mixer. I got to see if i cna borrow a DI from someone I been using the DI on the MB210
 
#16
Radial ProDI

Or make your own ground lift.

Get a 3' mic cable and disconnect pin 1 on one end and mark the cable so you know which one it is later.

Connect it to the amp DI first then connect another mic cable to it to send to snake/FOH mixer. Now your ground loop is broken.
 
#19
Floyd Eye said:
If your bass is coming through the mains something isn't set up correctly. Aux feed your subs and set your crossover properly.
Click to expand...

OP solved the problem, but if anybody else reads this thread, this is bad/misinformation. There's LOTS of bass guitar content in the frequencies serviced by main speakers. Usually the fundamental and one or two harmonics at best would end up coming from the subs, but the character of the bass (mids/mid highs) are goiing to be largely serviced by your main speakers, not the subs. If you aux feed subs and only put bass through the subs, that's a fast track to muddy/cr@ppy, unintelligible bass guitar in the mix.
 

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