Does that output impedance seem pretty high for the dac?
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No good for a passive with up to 2kohm dac output impedance and his power amp at 27kohm input impedance.
He needs an active preamp best would be a Schiit Freya with "passive" "tube" or "solid state" selectable outputs. Ideal because all with low gain.
And if the OP ever changes the dac to one with a nice low output impedance the the Schiit passive mode could be used to great effect.
Yes, the output impedance for the DAC seemed high to me. This is the information I received from Vlad at Audio Mirror. Also the output impedance for the SYS seems high. Is this so?
As to input impedances, am I right that the input impedance 'seen' by the DAC would be the sum of the input impedances for the DAC and AMP?
Also the BEL input impedance its 27K ohms not 22K ohms. Did not catch this in my edit. Thanks George.
I am enjoying the DAC. My Jolida pre has an input impedance of 100Kohms so the DACs output is no problem. I was enjoying the pre until the RFI/hum problem. Will be calling Jolida to to see what can be done. I replaced the Jolida with the preamp section of my NAD C356BEE. This combination provides silent background.
I own the Jolida Glass FX DAC III and I was curious about the 47K output impedance figure because my preamp lists 13K as the input impedance and the audio sounds OK. Well, I just called Jolida and they said that the actual output impedance is 600 ohm, i.e. less than even 1K, let alone 47K! So my input of 13K is 21.7 times the output, which is over twice more than the recommended 10 times figure.
I asked why 47K is on the website even now and all they could say is that it must be a typo.
According to the DAC manufacturer, there are alternatives to the low output 5977 tubes , and they recommend 6N1P, 6DJ8, ECC88, 6922 and 6H23P which can provide higher output.
They considered the 5977 the best sounding, but did not state what equipment they used for that subjective opinion. Perhaps try a set of the other tubes to see if if they solve your issue.