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 91 
 on: Yesterday at 08:05:12 am 
Started by Mike Sokol - Last post by Mike Sokol
My article on measuring for Reverse Polarity Bootleg Grounds just published in Mike Holt's electrical safety newsletter last night. This newsletter goes out to 50,000 electricians and inspectors around the country every day. Below is one of the comments from another pro-sound tech.

http://www.mikeholt.com/newsletters.php?action=display&letterID=1804&email=#comments

Comment Posted:
I am a professional audio technician working in theater and corporate audio/visual(A/V). Fortunately, working with pro A/V companies, I rarely see bootleg gear come my way any more. Through experience, I guess that we have all learned that prevention, meaning properly wired gear, is cheaper than spending time troubleshooting ground problems in the field. The most important tools in my bag of tricks on every show are a three light outlet tester and a multimeter. Thank you for showing the false readings displayed when testing bootleg plugs using a three light tester. On shows, before anyone plugs anything in to the power distribution center(PD), which is usually a two or three phase unit, I check voltage to determine proper wiring from the disconnect panel. You would not believe the stupid and unsafe wiring that we encounter. Not only is hot to hot, hot to neutral, and hot to ground measured, I also check hot to chassis, neutral to chassis, and ground to chassis as well. I also measure the voltage between neutral and ground. When necessary I also identify the different phases of the plugs on the PD. These simple tests are very important in knowing what we are dealing with before using the venue electrical system as ground hums and buzzes in any part of the A/V system are highly undesirable. Quite often I find that the venue provides a three phase system using only 4 wires. The ground and neutral are improperly bonded inside the local PD. Usually, as you mentioned, a reading of absolute zero volts ground to neutral is the first identifier of this condition. I always wonder if the bonded connection is derived from the load panel ground buss or the neutral buss. One of the most frustrating things that we encounter is using power from separately derived sources/transformers within a building. This frequently occurs when the front of house(FOH) mix position is plugged into a different power source than backstage, hence, different ground p ath. If there is a buzz or hum in the sound system we have several tricks and tools to use. One solution is to run a power cable to the FOH position from the same PD that all of backstage is plugged into. Another might be to use digital snakes instead of a traditional copper snakes. These may include fiber, ethernet, or coaxial. These methods can sometimes help eliminate undesirable ground loops/noise in the system. As for individual "local" problems, as was the case recently, it turned out that a computer power supply was creating noise on one of the computer audio playback channels. I magically found a power strip with a missing ground pin to use on the computer PSU. That helped, even as illegal as its use may have been. Improvisation is a very big part of creating a "clean" temporary A/V system. In all my years of doing this I have hardly ever encountered a GFCI outlet in any venue unless there is a generator company supplying show power or we are plugging things in to the kitchen/catering outlets.

Zippy

 92 
 on: Yesterday at 06:37:59 am 
Started by Riley Casey - Last post by Kevin McDonough
Hey

Another recommendation for Mark Bass, I've had quite a few come through the venue I house tech at, and saw a few on various freelance and festival work.

They sound great, and with PA systems these days usually having decent subs are usually more than enough for the gig and for the musician to monitor themselves. And they are stupidly light and compact for what they do. So much so that, with the separate head and cab systems, the some of the cab sections feels like there's been some mistake and you're picking up some sort of empty box!  ;D

k

 93 
 on: Yesterday at 06:02:19 am 
Started by Ivan Beaver - Last post by Len Zenith Jr
If you click "show more" on the description it does say "satire".

 94 
 on: Yesterday at 05:40:17 am 
Started by dick rees - Last post by John Fruits
Antimony is a color?

Note: only two metals have color, gold and copper.  All others are various shades of gray (that would be grey for you Brits).
I too would have to disagree.  Just look at your eatin' tools, stainless steel has a bluish tinge whereas real silverware has a warmish tinge. 

 95 
 on: Yesterday at 03:26:59 am 
Started by Ivan Beaver - Last post by Jeff Bankston
I use an electron stacker to improve my sound quality. Btw I have an audio file listed under BS.

 96 
 on: Yesterday at 02:27:55 am 
Started by Charles Razzell - Last post by Tim Weaver

 97 
 on: Yesterday at 02:19:37 am 
Started by Ivan Beaver - Last post by Chris Hindle
What, isn't this common knowledge ?
"poorly assembled" indeed.... ::)

This "access to unlimited information" is going to doom our planet.
Once upon a time, people had to pay good money to get a book published, or a movie made and distributed. This weeded out most of the BS. (except BoSe.)
Now, anyone can publish ANYTHING, and "Well, I saw it on the internet. Must be true" mentality has taken over those of lesser minds and analytical capability.
Sad, truly sad.

Chris.

 98 
 on: Yesterday at 02:05:00 am 
Started by David Pedd - Last post by Jonathan Goodall
I don't have to deal with riders very often but did have one a couple of years ago that was fairly straight forward apart from a quite specific Fender amp, no substitute I was informed. I ended up sourcing one and getting it freighted from half way across the country.  Got all set up for the show and the talent finally arrived, carrying a guitar case and pushing a flight case with, you guessed it, the amp requested listed in the rider.
The reaction when reaching the stage was "Oh, you've got one".
Further discussion revealed that basically no one else had bothered to get them one so they just started carrying their own.  Yes, they knew it was still on the rider but oh well.  Oh, and they preferred to use the one they had with them as it was already setup.

 99 
 on: Yesterday at 01:39:30 am 
Started by dick rees - Last post by Chris Hindle
Antimony is a color?

Note: only two metals have color, gold and copper.  All others are various shades of gray (that would be grey for you Brits).
Not yet maybe..........  ;D
Chris.

Huh, according to Wiki....
"Antimony is a native element that can occur in a natural state, but it is rarely pure. It almost always contains some arsenic, and may also contain traces of silver, iron, and sulfur. On a fresh or preserved surface, Antimony has a tin-white color with a slight blue tinge. Otherwise, it is dark gray due to tarnish."

Well Propmaster, keep thos IEMs nice and polished up for Spock and Uhura.

 100 
 on: Yesterday at 12:55:06 am 
Started by Ivan Beaver - Last post by BrianHenry
This is fake news.


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