Conrad Johnson SS amps


I am currently looking for a new power amplifier to drive my Martin Logan CLSIIs (4ohm load). I am deciding between CJ's MF2250 and MF2500. I was wondering what the difference was between the the stock model and the "A" model. ie: MF2250 vs. MF2250A. I would also like to know if they can they be bridged? Would I get better results using two MF2250 amps or a single MF2500 amp?
msilin
Msilin, thanks for your indulgence.
Overhand and Vortex, thanks for your input.
Overhang: Thanks for that info. Does this mean that both CJ 2300 and 2300A are both MOSFET-based amps?

Has anyone else noticed the "hole" in the MF2500A's lower mid/ upper bass that was described by Overhang?
Yeah,they are both mosfet amps,2300 and 2300A i mean.The hole is described in one of the reviews posted on CJ website.