DACs and bass response?

@charles1dad: I tried swapping out the digital cable, then the power cable. At first, I thought they were both contributing to the improved bass. After posting the above message, I listened further and and determined that the replacement power cord was actually rolling off highs, resulting in an overall "darker" tonality. It was also diminishing the overall sense of organization. The latter may not be an audiophile term. What I mean is that, with the replacement power cord, simultaneously overdubbed guitar parts, for example did not sound as if they were properly synced. Instead, there was a sense of chaos. Replacing the original power cord yield a sound I preferred. Nevertheless, I’m going to try still another digital cable.
as this is my first DAC, I have no previous experience with digital cables
and it seems prudent to explore a little further.

Take a deep breath Stuart away from this, and smell the roses. and come back in a few days.

Cheers George 

@stuartk the digital cables play very important part to allow the dac to perform at its best you must explore a little further here.
I use the Tellurium Q black coax cable which has extremely low jitter and designed to combat fase distortation with excellent results.

Here is what I determined by designing and building many digital cables, and making measurements on those and others:

1) the 75 ohm impedance of the cable is critical and should be uniform over it's length

2) Termination of the 75 ohm cable to RCA plugs is a non-starter.  Must be terminated to a proper 75 ohm connector, and a good one, like RF or BNC.

3) Use of pure silver in the 75 ohm cable is preferred, much better tonality.

4) 100% shield is beneficial

5) Conductor gauge is critical.  Should be 26 Gauge or smaller to avoid skin-effect

Here are a few measurements:

http://www.audiocircle.com/index.php?topic=154425.0

Steve N.

Empirical Audio

@audioengr

All cables will have a spectrum. All will be different, None will be perfect.

That is why you need jitter rejection in the DAC!