DIY- RCA to male BALANCED

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mclsound

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DIY- RCA to male BALANCED
« on: 28 Dec 2008, 10:07 pm »
i am adding a rca (from reciever pre-out) to male balanced for the input of Bryston 10blr.
I cut the female end off a pair of balanced mic cables and will solder a rca on it.
would you attach outer shield or just hot and cold(+,-) to rca.
the rca is a new Neutric pro series.
thanks John

James Tanner

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Re: DIY- RCA to male BALANCED
« Reply #1 on: 28 Dec 2008, 10:22 pm »
i am adding a rca (from reciever pre-out) to male balanced for the input of Bryston 10blr.
I cut the female end off a pair of balanced mic cables and will solder a rca on it.
would you attach outer shield or just hot and cold(+,-) to rca.
the rca is a new Neutric pro series.
thanks John

Only 2 wires not 3.

james

mclsound

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Re: DIY- RCA to male BALANCED
« Reply #2 on: 28 Dec 2008, 10:31 pm »
hi James,good holidays i hope.
so hot and cold,not outer shield,correct(this is what is confusing me)
John

James Tanner

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Re: DIY- RCA to male BALANCED
« Reply #3 on: 28 Dec 2008, 11:07 pm »
Depending if it is feeding a male or a female it is hooked up differently - I would contact Mike at Bryston for clarity.

james

brucek

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Re: DIY- RCA to male BALANCED
« Reply #4 on: 29 Dec 2008, 12:28 am »
Quote
so hot and cold,not outer shield,correct

Correct, the positive (+) of the RCA connects to the Pin 2 (+) of the XLR, and the ground of the RCA connects to the Pin 3 (-) of the XLR, and the shield of the XLR remains connected at the XLR end only and does not connect to the RCA.

This removes the physical connection between the RCA device chassis and the balanced chassis, which reduces the ground loop considerably. There is still noise rejection realized from this pseudo balanced configuration, since noise rejection basically relies on matched impedances at the two inputs of the differencial amplifier stage. The impedance of the positive differential amplifier will be that of the previous stages output impedance, while the negative differential amplifier will be at ground or zero impedance. The mismatch still offers decent noise rejection.

brucek

mclsound

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Re: DIY- RCA to male BALANCED
« Reply #5 on: 29 Dec 2008, 09:01 pm »
thanks all
john