Since we're talking about microphones, does anyone have a copy of the first Stereophile test CD? On it, J. Gordon Holt reads one of his articles through a series of changing mics. It's only a slight exaggeration to say that he sounds like a different person on different mics. The differences are really ear-opening
You can buy Mic and A to D converter test CD's here
Since pros know a bit about audio reproduction, researching what pros use is a viable alternative to making your own tests in a room with a microphone and a cymbal (unless you are prepared to test hundreds of consumer speakers I am not sure if this approach could be very productive - and what if a speaker does a cymbal well but many other things badly?).
There are pro audio forums such as Gearlutz where they discuss gear. Of course, they have individual differing opinions and a large number of pro speaker models are all considered acceptable (with of course a few very odd individual choices thrown in too!)...however there is often a general consensus on what sounds really good.