At what distance are balanced XLR cables needed?

Hope this helps:

My HT processor is an Anthem D2V. According to its specs, its input impedance is 20 kΩ, and its output impedance for "main" is 300Ω (RCA), 600 Ω (XLR), and for "zone 2" is 51Ω.

Impossible for me to determine EMI, but I plan on moving to an apartment in Manhattan.

I run 10meter interconnects, balanced and unbalanced, in Manhattan and have no noise problems with either. FWIW.

Kal

Thanks Kal. When discussing the output current, I'm assuming you meant my HT's output. If my apartment is relatively noise free, any concerns with running about 20 feet unbalanced given the d2v's impedance?

Kal, 10 meter unbalanced and no problems? How did you manage that? Unbalanced runs tend to act like an antenna in my experience, I had to resort to long runs of balanced interconnect to mitigate the attenuation.

There are no guarantees. I have heard of people resorting to balanced cables for much shorter lengths because their situations involve lots of EMI. (Do you live near a radio/TV transmitter?) Recording/mastering studios have miles of cables all influencing each other.

So, my cables are no less antennas than anyone else's but, as far as I can tell, they are not picking up any signals inside my apartment. Literally, YMMV.

Kal