Conrad Johnson SS amps

I own both a MF2250 ("non-A"), & a MF2500A. They are both excellent amps. The MF2250 is surprising in it's power given it's compact size, & sounds very clean & smooth with excellent dynamics. Of course, the 2500 sounds just that much better with hard to drive speakers. I can't really see any point to buying two 2250's instead of one 2500, altho I did consider that myself at one point. I think it's worth holding out for a 2500A since they only sell for $200-$300 more (used) than a "non A", & it costs $500 for CJ to do the upgrade. (But I'm sure the "non A" is excellent also given my experience with my 2250). Good luck!

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.

Hi
1.CJ MF 2500A cannot be bridged.It is impossible by design.
2.I bought 2 MF 2500A to biamp my Snell type B which is 4 ohm/86 db sensitive and is hugely dissapointed.These amps are bipolar design and they sound absolutely unConrad Johnson like.They also failed to bring my speakers to life.
Before i used a number of older CJ mosfet SS amps (like mf 2200, mf 200 which i still have) and was always amazed at how good they sounded and their ability to grab the woofers.MF 2500A in comparison sounds very thin and lean and there is a huge gap in lower midrange/upper midbass region.They have a good high freq extension though so if your speakers have no more than 3 drivers you might be satisfied with them.Mine has 2 midrange drivers,2 tweeters,1 10" woofer and 1 10" subwoofer per side so the hole in the freq spectrum is very apparent.
Also MF 2500A sounds terrible at low volumes as opposed to older amps so you need to really crank up the volume which might be a problem if you live in the apt bldg.Older CJ mosfet amps handle all kind of loads with ease.ML as i know is one tough load so i can see a potential problem.The speaker can sound lifeless like in my situation.
If you like 50s-60s jazz or classical,i say go for it,but all your rock cds will become unlistenable.If you have any questions feel free to e-mail me.Take care.steve.

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.

Yes,i like the old mosfet sound better.It is not as transparent on top as 2500 but it has that tubelike magic with solid state power.2500 sounds like SS.As for bass control i now have a very unpleasant rubbery bass,individual notes are not defined (no midbass,remember),all i hear is congested bass ramblings.This is strictly my experience and you may find these amps very pleasant.I will still keep both amps for my second system (there is no way i will make close to what i paid by selling them).I will be very selective when buying speakers for them.I heard them in a store paired with AP Virgo III and the results were really good,just don't match it with a full range/tough load speakers.You will lose.