Mono Blocks / why are they not more prevalent? + Wyrded4Sound SX1000R

@invalid - I am a huge fan of overbuilt and quiet power supplies, and I am sure the Krell is a great sounding amp.  My comments are not about whether there are great sounding stereo amplifiers that are better than some monoblock amplifiers, as I know there are, but rather that, all other things being equal, there are advantages to having amplifiers in separate enclosures for each channel, rather than having two channels in one enclosure.

Thank you everybody, 

I expect that there are differences that would be more evident with some designs than it is with others.  I've heard good amplifiers that were monobloc and others that were on one chassis. 

I own a pair of very expensive monoblocs and a fairly expensive single chassis amp.  My favorite is the single chassis amp, but, I have no doubt that this is the result of all of the other much more fundamental differences between the two--pushpull vs. single ended, 2a3 tubes vs. 349, different input tube, different everything else.  The builder of the single chassis amp could have easily built the amp as monobloc's (each channel and the power supply are entirely separate modules) and chose not to so do even though the additional cost would be relatively small (the additional power supply module would not be that expensive). 

For me, single chassis vs. monobloc would never be close to a deciding factor. 

Dear @mitch2  : Sorry for the delay.     @invalid  already gave you the rigth answer about the interchannel modulation..

R.

@mitch2  .. Do you know if your monoblocks have the same whole FR and FR deviation levels and same lever of distortions and noise and that when the speaker impedance curve that normally is not stable both unit respond exactly the same?.

In true your monoblocks are true matched one to the other?

R.