Hi Vicki
The short answer to your question is what ever length you can get away with.
An unbalanced cable is going to be prone to picking up all sorts of electrical
nasties and the longer the run the more nasties it is liable to pick up if they
are around. As with all things what you can get away with when there is no
other electrical equipment around is going to be a lot longer than if there is
nearby electrical equipment. Although just moving a cable a little one way or
the other can have an effect on what it is picking up.
Another thing to bear in mind is any cable acts like a capacitor which for,
shall we say 'normal' runs is not going to be a problem. But as the length gets
longer it can start to attenuate frequencies acting like a low pass filter.
This is dependant on the input impedance of the unit your using but try and go
for low capacitance cables if there is a choice.
So if you use good quality cable and if there is very little electrical
equipment causing interference then 100 feet (+) should be OK, you may even be
able to go longer.
The other thing you could do is use something like a FEL 3.5 series mic amp and
put that at the far end with the Telinga and then run the cable back to the
LS-10. You would then have a +20dB signal now running along the cable which
will be less prone to problems.
Have a look here:
http://www.felmicamps.co.uk/products/fel3.5series.html
Phil
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