Above posts are good for voicing one's system. I also use my own voice in order to ascertain natural timbre, tonality of my system. I love to sing, sang in many choirs back in the day, so often sing within my dedicated listening room. Really belt it out with operatic voice, hearing live voice within one's own room is extremely enlightening. Speaking, clapping, whistling, yelling can all be helpful as well, sometimes ugly sounds very telling, don't want to beautify the ugly. Used all the above in determining best use of acoustic treatments for my dedicated listening room, wide variety of music as well.
The one issue with using unamplified live music for voicing one's system is we then have to rely on aural memory. Not to say its not valid method, hearing a good amount of this over a lifetime certainly helps in training our sensory perceptions. Listening to live and reproduced music over audio systems in analytical mode is a skill, practice improves this skill. Just leaves out the insights gained from instant comparison to live voice and/or sounds reproduced within our listening rooms.
As far as colorations within systems, I maintain my estimation of neutral voicing of 005, silver content of wiring doesn't upset in the least. In my setup silver only adds transparency, resolving capability, no brightness or spotlighting of highs, no thinning of mids and bass, in fact I'd say highs and mids sound most natural with the aprox. 50/50 copper/silver content I currently employ. Excessive copper can harden mids, close in highs to some extent, silver opens things back up, and adds delicacy and sophistication.
No to say, I'm unaware of downsides of sliver in some systems, I've had systems in past very sensitive to silver, spotlit highs, thinning of mids, bass, so understand not for everyone.
I'd just like everyone to understand 005 is not inherently allergic to silver, this dac is voiced wonderfully, while it may not be warm enough for every taste and system, it is not hifish sounding. 005 not scared of silver or even rhodium, capable of wonderful harmonic development with a variety of metals.