On Tue, 29 May 2018 10:15:13 -0400, Mike Rivers
wrote:
On 5/29/2018 9:49 AM, wrote:
I just bought a used 100 foot snake.
I was surprised at the configuration.
It has 2 pair of heavy wires designated as speaker 1 and 2.
I had always though that running amps of current through a cable parallel to
mic cables would magnetically induce unacceptable amounts of crosstalk into the mic cables.
There was some measurable crosstalk but is was surprisingly low. Low enough that if the mic and speaker are in the same room, acoustic feedback by far dominates the electrical feedback caused by the crosstalk.
Does anyone have experience with snakes of this configuration?
No problems, as long as it's built correctly. It works because you have
balanced connections. Your mic inputs are differential, so that any
induced current in the mic pair will be cancelled out at the preamp
input. And, to boot, the speaker leads are, in essence, balanced, since
one goes positive and the other goes negative at the same time, so the
electromagnetic field around the speaker pairs is mostly cancelled, too.
It's not perfect, but as you determined, it's good enough for the
application for which you intend to use it.
Sometimes technology works in your favor.
Balanced connections work well, but not when they are very close to a
source of interference. They rely for their effect on exactly the same
field impinging on both phases. This doesn't apply when the source of
interference is close by - whichever wire is locally closer will
receive more interference. That's why cancellation is not perfect. I
would not run cables this way.
d
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