I've heard both on a Levenson system. Why pay the price of the M20s and have to spend 200 hours breaking them in? If you have tube gear, think of the cost let alone the time. For that reason alone, I like the 805-that is an unbiased, general opinion that can not be argued with. Even Revel tells you to break them in.
The 805s sound simply sweet, open and lively out of the box! Yes, the Revels are nice after break in but by then you have a hell of an ear ache.
The 805s sound simply sweet, open and lively out of the box! Yes, the Revels are nice after break in but by then you have a hell of an ear ache.