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I got two of these to power microphones for an R16 recorder. They are much quieter than the preamp with phantom power that I got first (which suffered from both resistor noise and power hum) I am using "amateur quality" microphones so it is not difficult for the PB223 to get below the noise threshold of the mics and the preamps of the R16. The final system does have white noise but much less than it had. There is no 60/120 cycle hum at all and there is no resistor noise as far as I can detect. In this most sensitive area of the system the microphones seem to be the source of what is for me an acceptable level of white noise. I have never need support from Rolls
I am primarily an amateur singer and have been singing for more than half a century.
Mostly Barbershop lately
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Submitted March 16, 2014 by a customer from yahoo.com