Trying out the D'Agostino S250

So to summarize:

The Select II and Reference have the same upgraded preamp module. The only difference is the height of the preamp module to match their respective chassis.

Both the Select II and Reference share the same digital input modules.

The Select II DAC has 8 DAC modules with 16 total DACs.
The Reference has 4 DAC modules with 8 total DACs.

The balanced output voltage is identical at 3.57 Volts RMS.
The output current is greater for the Select II, due to twice the number of DACs, although they don’t publish the spec.

The Select II has lower noise and higher dynamic range due to twice the number of DACs.
The Select II balanced output impedance is 75 ohms and the Reference is 150 ohms due to twice the number of DACs.

Please correct me if I’m wrong on any point.

Thanks,
Ken
 
I don't get it -- why should a 75 ohm drop in output impedance of a preamp drive amps with input impedance of > 50000 ohms better? As long as the output impedance of the preamp is 20 times lower, this difference in the preamp sections of the 2 dacs should not matter.
Anshul

asiufy said:
SELECT has 8 modules per channel, for a total of 16. That will not only drive amps directly, but do it at a lower impedance (75). This lower impedance is likely what's helping the SELECT preamp module handle amps better than the REF.
Click to expand...
 
apdoc2004,

I'm going by what I heard. I've heard the REF and SELECT in the same system, both going direct to amp. And the system with the SELECT controlled the bass better than when we had the REF on.

Lower impedance, extra output current, it's hard to say, specially since the rest of the system was unknown to me. I'm just reporting what I heard.


cheers,
alex
 
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