Increased sound stage, etc, are subjective claims. There are no measurements for these parameters, other than the impressions from one's ears, nervous system and consciousness.
Sure there is! Bias controlled testing.
Audiophile spoonbenders measure this all the time. Professional spoonbenders like Lavorgna, Plaskin, Van Es, Hall, Darko do it all the time in all manner of systems both at private residence and a noise laden, sub-optimal, trade show booth.
What I'm saying is I can decrease the soundstage, the bass, the depth of field for you using your own cabling soon as I introduce 1. An additional cable and 2. Remove your sighted your bias.