On 5/29/2018 12:35 PM, Don Pearce wrote:
Balanced connections work well, but not when they are very close to a
source of interference.
I test common mode rejection by holding The Wall Wart From Hell (I
believe Paul Stamler owns a copyright on that name) right next to a
cable going to whatever I'm testing. The test fixture that THAT uses to
demonstrate the CMRR of their inGenius chip consists of two pieces of
cable as close together as they can get, one with the interference, and
that's a good enough demo for them.
You do need to use good twisted pair for the gozinta in order to get the
best results.
I would not run cables this way.
Well, don't, if you don't have a need to. But it's a convenience for
certain setups, for example, when using a powered mixer. And in general,
people who use powered mixers don't worry about a barely measurable
amount of crosstalk. My preference is to put the power amplifiers near
the speakers and run line level from the mixer to the amplifiers. But
there's less need to do that in smaller installations now that powered
speakers are becoming the norm for a "no engineer" system.
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