PaulMmn
Senior Member
- Location
- Union, KY, USA
- Occupation
- EIT - Engineer in Training, Lafayette College
Are they using wireless mics for the talent? I'm sure that can add to the fun!
The idea is to provide a chassis ground that is as close to earth as possible, rather than using local EGCs or conduits with possibly-noise-laden aggregate leakage currents.
Much modern electronics have no EGCs, so an IG installation would have no effect on those devices.
This is an aside.
I was a Musician, having many hours of recording in a studio setting. Most savvy musicians know that most noise issues can be solved by " lifting " the ground on said piece of equipment. That is, it will stop the hum and noise coming over the speakers. One day we spent some time and found one new generation piece of equipment throwing noise back into the line. It was in fact, a Yamaha, SPX-90. What needs to be realized is that a whale of a lot of Solid State gear below the industrial market is Engineered and built very poorly, and it seems to keep getting worse. The Engineers are doing what they " can " do rather than what they should do and its because everything has been " Monetized." Would an isolated ground have worked? We never had one to try out, so I have no idea how they behave under real world field circumstances. Much about the field of Engineering since the 1980s is about them being further removed, separated, and divided from reality. As thus we have a major lot of solid state gear that is very shoddy and in the large performs very badly, and most people are running around thinking its all so cool.
This is a non-sequitur, and its time to call a spade as a spade. When large numbers of Tech people start saying no, this will be a sign that change is on the horizon.
The time wasted is colossal.
I assume you mean lift the signal ground/DC B- circuit ground from the AC power EGC equipment grounded chassis.I was a Musician, having many hours of recording in a studio setting. Most savvy musicians know that most noise issues can be solved by " lifting " the ground on said piece of equipment.
I assume you mean lift the signal ground/DC B- circuit ground from the AC power EGC equipment grounded chassis.
The sound guy in the OP is not lifting anything. He's plugging in the gear and using it.
If anything needed to be "lifted off" then it should have been done in engineering phase and incorporated into the design.
Install it all and see what happens. As of now there is nothing up and running.
Most pro audio equipment uses balanced interconnects.
And please keep in mind that the balanced-to-unbalanced transformers in the in-line XLR to 1/4 phone adapters are generally very small and good only for mike level signals. They will saturate if you try to use them on line level signals. There is a reason that good direct boxes cost a lot more, they use larger transformers.Surely, however most also use electronic devices to both drive and received the balanced line (in place of a transformer), and those devices are (a) signal-ground-referenced and (b) don't always have the best balance anyway. If you want real isolation, use a good transformer.
My response was to StarCat post #20.
It could be StarCat was talking about lifting the EGC using a ground cheater (3 wire to 2 wire plug in adapter) at the mains receptacle outlet.
Beings you responded to my post, there is a lot audio designers that connect the circuit ground directly to the chassis when an EGC is used. Poor circuit grounding design.... Doing so directly dumps any noise that may be on the EGC onto the signal ground of the piece of audio equipment. It is also more than likely to cause ground loop hum when more than one AC branch circuit is used to feed audio equipment where the audio signal is connected from one piece of audio equipment to another piece of audio equipment by SE interconnects.
Most pro audio equipment uses balanced interconnects.
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When you hear "ground lift" in audio, it generally means there is a switch that disconnects the ground. I see them mostly on direct boxes but have seen them on other equipment. Usually they are a toggle switch.