A cry for help to Snell B owners

Have you ever experienced that a powerful on paper amplifier couldn't bring your speakers to life?
I just encountered this problem .I bought 2(two!) Conrad-Johnson MF 2500A (each is rated at 240 watts per channel) for vertical bi-amping and this combo cannot bring Snell type B to life.I hear high frequencies,upper midrange and bass,no lower midrange and midbass.There is no soundstage,just flat music coming out of the left and right speaker.The burn-in is out of question because i've been running this combo 24/7 for a month already.Before i had (still do) one 13 year old Conrad Johnson MF 200 (rated at 200 watts per ch) and it was moving those speakers with ease.When i look closely at the midrange with the old amp playing,i can actually see the drivers move,while with the new ones i can only feel them move by touching the drivers.
I called CJ office and they are puzzled.I tried reaching Snell but all their numbers are disconnected (the recent one with 978 area code).I know that the amps are not faulty.
The only last step left for me is disconnecting crossover and bi-amp with external one,but i have no idea how to do it and which one to use.Please,help me.
If the speakers still operate the way you expect them to when you use your old amp, I would suspect you are somehow hooking up the biamping incorrectly. What happens when you use one of the new amps conventionally? Can you fully descibe your signal routing in biamp mode from the preamp onward?
Something definitely does not sound correct. I have used a single 100W Classe' DR-10 with my B's and they did pretty well. I have also bi-amped with the Classe's and things got a little better but not it definitely wasn't a huge difference. Try just using a single CJ MF2500 and see what happens. Conrad Johnson wouldn't be my first choice of amps with the B's but it still should be pretty musical.

I do vertical biamping,each amp driving each speaker.With single amp connected the story is the same.It's like they can't grab those drivers.The music is playing but it is lifeless and flat.I had the same problem in the mid 90s when i borrowed my friend's Legacy amplifier,which was 240 watts per ch,but cheap Rotel did the job just fine.the reason i chose CJ was that they are famous for their mirange and i thought that would compliment Snell's sweet midrange drivers.
Although this case doesn't make a lot of sense to me - and I wonder how much of what you report is subjective in nature or how much of it I would hear if I auditioned your set up - I suppose the remote possibility exists that what you're really not liking is that the more powerful amps are actually controlling the speakers' drivers *better* than your older amps. Maybe these speakers are apt to sound a bit 'looser' with some amplification, and you enjoy the way they sound more as a result. If so, you might be able to make an improvement by repositioning the speakers.

I have to admit I find this explanation somewhat farfetched, but I also have to admit that when I used to work in a shop that sold Snell, I never liked the B's much no matter what amps we put with them (and we used Levinson, McIntosh, ARC SS amplification of up to 400 watts.) But, my complaints about them were almost diametrically opposed to what you're describing, so I'll demur. Sorry to criticize a speaker you've liked and own, but to sum up, I think your new amps must be fine, and you might want to start thinking about looking for new speakers.
If these are the vintage Snells I think they are, you might want to think twice before tampering with the crossovers. I believe that was part of Dr. Snells fame, that every pair of speakers were calibrated to the nth degree to a reference pair. I'd imagine that the crossovers were more than a minor part of this.

I own a mint set of B's. I worked with Peter Snell's dad and his brother (Tom) for a while (long after Peter's death), so I have this deep mystique over Snell speakers.

The B's have shattered that blind faith in me.

I have had similar problems in "bringing them to life." For months they sounded more like instrument amplifiers hooked up to a turntable (ugh).

I own two sets of Snell A's (wonderful) and a set of C's (also great), but nothing came out of the B's that approximated that level of listening.

I switched out interconnects, speaker cables, amp/pre-amp. Added a sub woofer at one point, and then finally called Snell completely frustrated.

You can still reach them (use Google) and the company is still great. I spent an hour with an engineer and he basically said that these might be the worst Snell ever made from a user's perspective. All the right components in an odd shape that most people do not deal well with once they get it home.

Here is what I took from the conversation and it has helped me.

Use lots of power and listen moderately and these will begin to live for you. I use the upper Adcom amp and preamp with the gold fronts, I think it is 300 w/ch. I switched to Tara Labs thick cables and Tara interconnects (getting away from silver Kimbers and speaker wires) and the sound mellowed nicely.

Still, they sounded like Bose 901's turned the wrong way in a room.

The best information he gave was to use the Snell A speaker placement instructions and forget the speaker shape of the B's. Line them with the drivers facing front and start about 8' apart (nothing in between the two speakers) and 2 feet from the back wall. I find the closer these come to a room corner the more they lose fidelity.

Try the back tweeter switch on high.

What that gave me was a Snell speaker. Before it was a sense of idiocy for not being able to run the set since I trust the company name.

So I kept the B's. I like them more and more. They are not my best speakers, but they are nice speakers and the look of the case is attractive and the drivers are not going to wear out (from cone rot) ever.

I do bi-wire. I don't use my tube equipment on them. I do find that they are really sensitive to room acoustics and placement. More than anything I have ever known.

But... find the sweet spot and listen to a favorite tune and you will smile.

BTW, even the famous A's need time to find a spot in your room before they offer life-changing sound. The B's are like the A's finicky, spoiled siblings. Great DNA, but a nasty placement temperment.
I ran Bs for some years. They did quite well. We were putting a lot of excursion on the LF drivers and had them replaced twice before Snell replaced them with a beefed up set and we had no further problems. The reason you can't get a grip on the driver is that it is nearly 20 ohms at 60 Hz. Most transistor amps don't make any power at that impedance- if you have a 250 watt amp it will make about 90 watts at that frequency. So the speaker will appear bass shy. Try a tube amp instead.

If I'm wrong I'd like to hear about what you find out. We had excellent results but had to sell the speaker as it was getting to be too 'inexpensive' for us to be taken seriously with it (politics!). But I remember the speaker fondly. It took about 9 months to really break-in properly, and after that people commented how it had resolution similar to electrostatics.

Good Luck!