2. amps-preamps
  3. 1250103617

Unbalanced pre out to balanced amp in

I have a Modwright preamp with RCA outs and Channel Island amps with balanced inputs. I have always just made up cables with RCA outs and XLR connector inputs. But I have had to extend the distance between the amps and preamp and the new run has the cables going by a few power cords, a TV, an ethernet cable and other possible sources of noise. I would like to experiment with a transformer to convert the unbalanced output to balanced and then use 3 conductor cables for the run. Does anyone have any suggestions. And has anyone used a transformer they could recommend?

Thanks,
Mark.
regalma1
marakanetz's avatar
marakanetz
5,473 posts
 
There's also excellent active component which is ATI "The Match Maker" often available at ebay. Virtually noise free and ideal impedance matching for lines of any length + the price is often bellow $100 for used.
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atmasphere's avatar
atmasphere
12,039 posts
 
From the data sheet, a fairly wide range of impedances is shown for the load, but they also show that the output impedance of the transformer is 80 ohms. There is a rule of thumb that suggests that the load would be about 800 ohm (IOW 10X the output impedance).

There is an optimal value- it looks to me (based on the specs) as if this unit is designed to support 600 ohm operation. I bet 600 ohms would do the job nicely. Have you tried loading it ever?

With the right load not only will you get broader, flatter frequency response, but the unit will be more transparent too.
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marakanetz's avatar
marakanetz
5,473 posts
 
Is 'across' meant in-series or in-parallel?
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