[quote author="SSLtech"][quote author="Wavebourn"]So grounding in the randomly selected point is no good, it creates a ground loop that will cause hum and RFI of the level depending on what point was selected randomly... That's why I prefer transformers over electronic balancing.[/quote]
I know I keep coming back to some of these issues, but I simply cannot accept this as a stated 'fact'.
How exactly does grounding to a randomly-selected point definately create a ground loop?
There are too many people with too sketchy a grasp of the issues reading this and taking this stuff as fact.
I have to say that I disagree with the above assertion as written.
There may be a language issue or something, but essentially, in plain english the above statement is misleading at best, and wrong at worst.
Sorry 'bout that, but it's how I feel.
Keith[/quote]
May be it is a language related issue, so let's draw an interlingual picture.
If you take one ground wire and connect it through a power outlet, another wires through your ins/outs, there will be 2 ground wires at least (actually, more) and any current through the "earth" in power outlet will be reflected on your internal wires. That's why I always run my notebook on batteries when recording live concerts... Ground points in the gear I have to connect together were selected "randomly", indeed...
I preach some new topics:
"Keith, I wired everything like you said, but when I connect my mic pres, compressors, gates, equalizers, to my A/D converter I always hear strange beeps and boiling eggs. Help!"
If they ground one point, but randomly selected the point of minimal dynamic resistance in a power supply, the case is the best.