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Date: July 01, 2003 at 03:45:08
From: Jon, [trltechadsl.claranet.co.uk]
Subject: Re: Amp question


Derek,

How exactly are you trying to connect the amplifier?

I'm assuming you want to connect one RCA (LFE Out) to both the XLR inputs on the amplifier (A+B) Are you running the amp in bridged mode? Does the amp need both inputs to be present in Bridged mode?

You may have a prblem with impediances. Most recievers have quite a high output impediance (My Yamaha has 1K output impediance), the XLR will have 600Ohm input impediance, and a pair of them in parallel will ob, be 300Ohm. This will drag the output of your LFE very low. The LFE RCA is expecting an impediance of 10K-50K Ohm not 300 Ohm.

If you have an impediance problem you will have to either get a matching transformer, ot an active line driver from RCA to XLR.

If your amplifier will drive in to 600/300Ohm then the wiring you need is below:

Pin 1 = Shield ground
Pin 2 = Positive balanced signal
Pin 3 = Negative balanced signal

So you need to link pins 1 & 3 on the XLRs, then run the ground of the RCA to pins 1 & 3, and the signal of the RCA to pin 2

Hope this helps.
Jon


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