Regarding reverberation, if we're talking accuracy, there shouldn't be too much debate. You want the room to be as neutral as possible, so as to not add to the original signal. An anechoic chamber however, unlike headphones, plays with us psycho-acoustically (I've known people to feel sick in them). It turns out that we need some decay to be comfortable in enclosed spaces, and low frequency decays especially, need to relate to room size.
When we design, model and test rooms, we shoot for (unless otherwise selected) reverberation times between 0.25-0.35 seconds from about 125 Hz. and up, with slightly longer decays below 125 Hz. to be coherent with room size.
With our Frequency Response Panel (FRP) system we can offer this kind of control using the right panel type, the right quantity, at the right locations. We look at room modes, first order reflections and reverberation times. Depending on the furnishings, etc. we typically absorb first order reflections up front and diffuse the rears. If reverb times are too low, replace absorbers with diffusers and see where you are.
In general, neutrality means short, linear decay times, and attenuation of first order reflections of about 15 dB below the direct signal.
Note how critical reverberation times are to resolution, articulation, dynamics and timbre. Untreated, each room is as unique as a signature. Speak to someone at your home over the poor fidelity of a cell phone and you easily recognize what room they're talking in.
FYI, we posted some interesting sound clips regarding reverberation times of small rooms, etc. at http://www.avroomservice.com/sounds/
. For example, you can listen to the the difference between a 0.25 sec. decay and a 0.40 sec. decay.