There are two things you can do to find the best DAC: First you can measure the output of fixed frequency signals. There are a lot of these around (Stereophile etc). You will also need a scope for this. Without that your ears are the best tool. No amount of claims can be a substitute for a listening test.
Dither,wordlength,jitter?
I use very high quality CD transport with ultra low jitter and 24 bit DAC.Do units that offer resolution enhancement by increasing word length on the output and dithering options really work? I guess the most confusing part for me to grasp is this.Do all transports output a 16 bit word length? and how does the 24 bit dac resolution fit into the equation.Do you need to send a dac an increased word length for best results And lastly do single box players already include resolution enhancement circuitry.Thanks in advance for any enlightenment...