Amp for JBL 250 Ti

It's rather confusing - do I need the high current traditional amp like Krell or Mark Levinson or does the autoformer Mac do?

Autoformer is going to be more circuitry to the amplifiers design and signal path. The 250Ti should not have any wild impedance curves not sure if they are 8 or 4 ohm load. Some reason 6 ohms comes to mind. In any event they do need power so your options will be a Mcintosh amp 300+ watts/ch or a lower powered (200+w/ch) higher current amp like a levinson krell and so on.

My experience with the high current/headroom type amplifier is that they will give you better bass control. Much tighter bass and midrange is clean and crisp from this type of amp. The 250Ti from what I remember was not your typical JBL monitor west coast sound but a neutral balanced sound.

Mc-2300 are not an autoformer type amplifier. I'm not a big advocate of the autoformer for the reason I stated.
This amp seems to have endless power for whatever reason. they have a very similar sound to my Mc-3500's Good candidate for your 250Ti

Apachef1, but 2300 has all the different Ohm outputs just like typical autoformer Macs? Are you sure it's not autoformer? And if autoformer Macs were not a good match for JBLs why so many people use them together? Because they look cool together? I certainly didn't find Macs to be a good match for B&Ws (and many people swear by this combo).

I didn't think autoformers were used until the Mc2500 or 2600 in the bigger industrial look amps and I'm not sure about any of the blue meter Mc amps
As far as the matching Ohm outputs that would be the different locations where the power transformer is taped from not necessarily an autoformer. It would be more common to see multiple tap locations on tube amplifiers than solid-state.

My Mc-3500's have even more tap positions than the 2300 but they were for industrial applications rather than for sound reproduction

I'm not saying the Autoformer is better or not for sound reproduction. All I'm saying is I dont prefer it if your speaker system has a stable impedance curve like your 250Ti
If you are driving a pair of electro-stats or maggies that can dip below 1 ohm in certain frequencies then an autoformer will benefit you a lot. A levinsen krell and the likes are really not meant to drive any impedance's below 2 ohms and really need to be 4 ohms or higher.
You're asking for amps that will drive your JBL 250Ti speakers. I'm just giving you more options and what to expect on performance. I'm definitely don't want to start a debate on Autoformer or no Autoformer or MC vs Levinson Krell Pass and so on
Its all great equipment solid craftsmanship engineering but they all have strengths and weaknesses. There is more to mating a speaker to an amplifier. Understanding the principles of what a speaker needs to preform at is peak will help you make a wise amplifier purchase for your speaker.

Thanx! It's strange I always thought the opposite - that autoformers work great if the impendance is stable at 4 or 8 Ohms for example and don't work so nice with a heavy load like B&W (my 6900 went to powerguard with 802D's several times a day and generally sounded like crap - the same amp gave me tons of pleasure with JBL L150).