Benchmark DAC-1 vs DAC-1 HDR


The Benchmark DAC-1 has recieved stellar comments on this site. Their HDR offers additional benefits and appears to have no drawbacks in comparison (other than price). I know they switched op amps between the DAC-1 and the DAC-1 PRE and DAC-1 HDR. Has anyone found a downside between the models as one goes up the line ?
musicnoise

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Is anyone running a Benchmark DAC-1 output to a preamp rather than directly to an amp (i.e CDP to DAC-1 to Preamp to amp)? Even better, is anyone running it to a Mcintosh solid state preamp? If so, what attenuator setting did you use ? Additionally, what was the effect of inserting the DAC-1?