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At what distance are balanced XLR cables needed?

I've been looking for a new preamp for my 2 channel system, and I'm debating whether I need balanced inputs if I want to eventually connect it to my home theater processor. I plan on moving soon, so I can't say for sure what distance I would have between the two systems. My preamp options quickly dwindle if I require XLR cables.
hoffer71
kr4's avatar
kr4
3,680 posts
 
No answer is possible without knowing (1) the output current abilities of your preamp and (2) how much EMI noise there is.

Kal
eldartford
4,262 posts
 
If the HT Processor output impedance is about 50 ohms or less (typical for solid state) 20 feet should work fine.
hoffer71 OP
8 posts
 
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.
kr4's avatar
kr4
3,680 posts
 
I run 10meter interconnects, balanced and unbalanced, in Manhattan and have no noise problems with either. FWIW.

Kal
hoffer71 OP
8 posts
 
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?
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