I've yet to see a test protocol that can measure/ represent things like the perceived depth / width of a recording be it from a DAC / AMP / transducer ( speakers, headphones, earphones). I seriously would like to see one as it would take away the subjectivity of many listening reviews.
Those things are a function of a) the recording technique, and b) loudspeakers (in conjunction with the listening room). Your properly working DAC is not going to affect those things. The power amplifier might be important, but only if it is a huge mismatch, power-wise, vis-a-vis your speakers, causing your speakers or amplifier to act up. Generally, unless your speakers are particularly difficult to drive (impedance-wise) and require a lot of power (low sensitivity), and you only listen with a 5 watt SET tube amp, it's probably not going to be a big deal for you. Most people know what kind of amplifier power is required for their particular set-up.
As far as speakers go, you can get a pretty good idea about how a speaker is designed, and how it might sound, from sophisticated measurements. Back in the '70s and '80s you could contrast the work of Richard Heyser in
Audio, with the simplistic stuff done by Julian Hirsch in
Stereo Review. But even then, and armed with all the graphs in the world, you really had/have to put it in your living room, move it around, and play with it a while in order to find out.