"David Farber" wrote in message ...
William Sommerwerck wrote:

The 1/4" phone jack is (supposedly) a balanced line-level input. If
you plug a mono plug into it, the plug's sleeve will short the jack's
ring to ground. This is normal; there's nothing inherently wrong with
this. It's one way unbalanced signals can be connected to balanced
inputs.
http://www.behringer.com/EN/Products/B215.aspx
I suspect you have a problem that isn't really a problem.

Hi William,

I think if you take an ohmmeter and connect it to a speaker input, and it
measures the lowest reading that it can display, that would be cause for
concern. The only time this happens is when the stereo plug is inserted into
the jack even when the plug isn't connected to anything. How do you perceive
that this isn't a problem?
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As far as I can tell, this isn't a speaker input -- it's a balanced amplifier
input. There is no reason why a mono plug or stereo plug should show a short.

Your description of what's going on seems inconsistent and confused.