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

Showing 9 responses by unsound

^Even for one with an extraordinary amount of experience, the more variables, and some variables garner more weight than others, the less pertinent such auditions are.
^While the current delivery might not be ideal, it could be adequate for your Thiel 2.4 SEs.
^Perhaps I should have said earlier c-j MF ss amps. I believe the latter ones use both mosfets and bipolars.
I think the Sonographe amps unlike the c-j MF ss amps used bipolar devices.  Though sounding slightly different, both were very good. Either one might be preferable depending on the rest of the system.
I'm curious how these amps do with 4 Ohm loads or less. Conrad-Johnson has an odd policy of stating their tube amps out put into 4 Ohms, but, refuses to do so for their solid state amps. I've got to believe that many people are dismissing their products out of hand due to this weird policy. I've asked this before, but , I'll try again; has anyone compared the older all mosfet high powered 2300 amps to the newer 2250 mosfet/bipolar amps? They are about the same price on the used market. Sorry if I'm stealing this thread.
Msilin, please accept my appologies for stealing your thread.
Overhang, in my case I find my present speakers have slight tendency to be a litlle soft in the lower midrange-upper bass, perhaps a little leaness might be beneficial? How ever if by "huge gap" your talking about a "suckout" I would imagine that would only make things worse. BTW, I'm currently using the original Conrad-Johnson all mosfet amp and a ss c-j preamp. Since my move, my listening room has doubled in volume and think I need more power. On the other hand bipolars have the reputation for tightening bass response. I can achieve the volume levels I want, how ever the sound starts to become a bit harder as a raise the volume. This was something that didn't occur in my old room. The softness previously described has always been there in some measure, it's just more notice now. I just may have to move up to a bigger speaker as well. I really do like the the speakers quite a bit, so I may just move up to the next size from the same manufacturer. My present speakers have a 6 Ohm load that drops to 5 Ohms. The ones I'm considering are a steady 4 Ohm load. Am I correct in thinking that you suggest an MF2300 over an 2250 which sell for about the same price used. I weclome your experienced thoughts.
Msilin, thanks for your indulgence.
Overhand and Vortex, thanks for your input.
Overhang, I just read the reviews you refered to. It seems to me they were describing a leaness in the upper bass region not a suckout or "hole". In a perfect world I wouldn't recommend faults to band aid problems, but, budgets do exist and sometimes we must resort to "band aids" for the best affordable sound. I wonder if this leaness would tighten up and compensate for the softness in this region in my system?