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anyone have this problem

T

tramp

Mar 5, 2004
250
7
South Louisiana
www.originaltramps.com
#1
I have a fender bassman 150. This is a good amp. I played a gig this weekend. I was lined out and the sound man for the club (a kid in his early 20's)puts his earphones to set the bass and tells me that is a loud buzz in the phones. He could not set the bass in the mains. It as distorted and a terrible sound to boot. The monitor sound was ok. There was no buzz coming out of the mains or the monitors. I turned down my output for the lineout, flipped the gound switch and still had the buzz. I pulled the cable out of the lineout and used a mike and the buzzing went away. Than trying to set sound for the horns, he says that there is something wrong with the pa system. We have not had any problems with the system until this gig. I might add that on all previous gigs, I had no problem lineing out with my amp. This weekend, we are playing at a casino and we will line out to their pa system. I will see than if it is the amp lineout or the soundman at the club.
Tramp
 
#2
The line out buzz problem can come from a number of sources.
1, Bad Cable is the simplest and most obvious.
2, Bad power is the next most likely (inherent in the club)
3, Having the pa powered on the same circuit as the light dimmers and/or neon beer signs ( those neon signs are the most annoying noise because the operate on a high frequency that is not filtered by most amps)
4, the pa is not properly grounded or shielded in the first place.
5, The soundman is clueless
 
#5
The cable I used for the mike was the same cable that was in my line out. I had a direct box with me and never thought to try it. I plug the line out cable in the snake. Like I said, there was no buzz period in the monitors or the speakers for the mains. Only when he put his earphones on. He had to take the earphones off because the buzzing was hurting his ears. I think this was a kid tinkering. Before we started playing, the monitors quit working and the "soundman" couldn't fix that. We went 3/4 of the night with no monitors.The was no problem with the gig we played 2 day earlier.
 
#6
clueless soundman sounds about right. also, the fact that the buzz was only audible thru the headphones makes me wonder if instead of describing 60 cycle hum, he was instead describing distortion/overexcursion of the headphone "speakers" themselves, which often happens when running bass guitar thru them unless it's compressed to heck. ;)
 
#7
Is it possible that the PA was plugged into a differnet phase of 3-phase? This would only happen in a large venue like a BIG school, church or civic center. If your power is 120 degrees out-of-phase with his, problems arise. You would think that all the DC filtering and such in most equip. would filter this out but it is something to look at.
 
#8
thedoctor said:
Is it possible that the PA was plugged into a differnet phase of 3-phase? This would only happen in a large venue like a BIG school, church or civic center. If your power is 120 degrees out-of-phase with his, problems arise. You would think that all the DC filtering and such in most equip. would filter this out but it is something to look at.
Click to expand...

That wouldn't cause a problem.
 

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