This isn't really a DIY question, but I thought this would be the most knowledgeable group for this question.
I have two Frontier Tango 24 DA/AD Convertors that I want to use for mixing audio with analog summing. I did a bunch of measurements on them using RMAA, and they are excellent performers overall, with about 105 dB of dynamic range, flat frequency response, and 0.002% THD.
They have 1 problem though. They have 60 cycle hum at -98 dBFS on the DAC side. They use an external AC/AC power supply, 10V @ 4 Amps, line lump style. I'm thinking that the 60 cycle hum has to be coming from the power supply.
Does anyone know of a 10V AC power supply that has excellent performance? Budget is maybe $100. If it could run two DACs (8 amps I guess), that would be even better.
Also, will using a better power supply fix the problem? Or is it inherent in the design of the DAC? Is there a simple mod that may fix it?
EDIT: The 60 cycle hum also has harmonics.
Edited by barleyguy - 12/10/12 at 7:22pm