FWIW there is a general rule of thumb that you can follow regarding MA-2s and MA-1s. That is: if the speaker is known to work with tubes, it will be OK.
IMO there is a myth that a speaker has to be 'OTL friendly' (for example in the case of the MA-2, Manaplanars are 'OTL friendly') before any OTL can drive that speaker. IME what is needed is more like a 'tube friendly' speaker. see
http://www.atma-sphere.com/papers/paradigm_paper2.html
for more information.
What you get from this is that a zero-feedback transformer-coupled tube amplifier, or a zero feedback **transistor** amplifier will have similar load requirements.
IMO there is a myth that a speaker has to be 'OTL friendly' (for example in the case of the MA-2, Manaplanars are 'OTL friendly') before any OTL can drive that speaker. IME what is needed is more like a 'tube friendly' speaker. see
http://www.atma-sphere.com/papers/paradigm_paper2.html
for more information.
What you get from this is that a zero-feedback transformer-coupled tube amplifier, or a zero feedback **transistor** amplifier will have similar load requirements.