Suitable amplifier for NOS DAC, any experience

[dmatiukas]

Hi,

I use R2R NOS DAC. This type of DAC's have images on analogue output.
DAC output filtered with Capacitor and have -6db roll-off from 25KHz so images are significant.

I would like to build power amplifier and connect them directly to DAC output.
So just R2R DAC resistors, capacitor and power amplifier.

Does someone have experience and knows what important parameters should conform power amplifier ?

 

[Mark Tillotson]

Sampling frequency of the DAC?

 

[dmatiukas]

44.1khz..96khz

 

[sumotan]

Im using Aya Nos never experience such issues be it SS or Tube. Output of your dac has a signal caps in most SS amp on input side there's also a lpf made up of cap & resistor.

 

[abraxalito]

Doesn't AYA DAC have a passive filter after the DAC?

Some classD amps are rather sensitive to out-of-band signals - I seem to recall Hypex n-Core may well be one of them. Perhaps use a classAB with good HF distortion figures? Alternatively use a filter after your DAC to suppress images.

 

[sumotan]

It does Richard but I've taken it out & replaced with a line trafo.
I've gone through 4 amps including Hypex ucd 180 & 400 no issues at all.

Cheers

 

[abraxalito]

The leakage inductance of the trafo will be acting as a LPF then.

 

[sumotan]

No Richard before I use trafo I even use the dac without its lpf & connect directly to amp.
On Aya there m's 2 ports to null DC but that still needs for the dac to reach warm up before it reaches zero.

 

[miro1360]

technics SE-A7 si fine