600 ohm resistor between "+" and "-" of balanced inputs.

skpb · 20th October 2006, 10:18 AM

Is it now a common practice to use 600 ohm resistor between "+" and "-" of balanced inputs?

I heard, that it WAS common practice , but now it is not.
Is it true?

Ouroboros · 20th October 2006, 10:23 AM

Most balanced-input audio equipment now seems to use input impedances of around 10k Ohms. Telephone equipment is still tested with a 600R load (or a complex impedance load that averages around 600R across the 300Hz to 4kHx range).

NjoyTHEMUSIC · 20th October 2006, 12:19 PM

Hi both ...

I've just acquired a power amp that has 'Balanced input' capability...
In the users manual, it talks about when using the std RCA inputs, to short out the balanced inputs. Is this what your are talking about, or is your angle more to do with 'loading' the balanced input while using its input connection?

If you know anything about what I read in the instruction manual I'd really appreciate any pointers as to how I can correctly wire some shorting XLR plugs for the amp !

Much appreciated,

-Andy-

skpb · 20th October 2006, 12:38 PM

No, my question has nothing to do with Your situation.

You have to use a simple XLR->BNC adaptor which actually shortens "-" signal to ground.

20th October 2006, 10:18 AM	#1
skpb diyAudio Member Join Date: Jan 2006 Location: Moscow	600 ohm resistor between "+" and "-" of balanced inputs. Is it now a common practice to use 600 ohm resistor between "+" and "-" of balanced inputs? I heard, that it WAS common practice , but now it is not. Is it true?

20th October 2006, 12:19 PM	#3
NjoyTHEMUSIC diyAudio Member Join Date: Mar 2006 Location: Where the sheep scream for Mercy !!	Hi both ... I've just acquired a power amp that has 'Balanced input' capability... In the users manual, it talks about when using the std RCA inputs, to short out the balanced inputs. Is this what your are talking about, or is your angle more to do with 'loading' the balanced input while using its input connection? If you know anything about what I read in the instruction manual I'd really appreciate any pointers as to how I can correctly wire some shorting XLR plugs for the amp ! Much appreciated, -Andy- __________________ I wish I had one more brain cell.....then the one that I've got wouldn't be so lonely (!)

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20th October 2006, 10:23 AM	#2
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	Most balanced-input audio equipment now seems to use input impedances of around 10k Ohms. Telephone equipment is still tested with a 600R load (or a complex impedance load that averages around 600R across the 300Hz to 4kHx range).

20th October 2006, 12:38 PM	#4
skpb diyAudio Member Join Date: Jan 2006 Location: Moscow	No, my question has nothing to do with Your situation. You have to use a simple XLR->BNC adaptor which actually shortens "-" signal to ground.

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