I would not call the speaker 'incredibly efficient', its sensitivity is 94 db but because it is also 4 ohms the actual efficiency is 91 db.
But that is not so hard to drive and since the deep bass is handled by a separate amp, I think our MA-1 could do the job (it also is a fully differential balanced amp with a balanced input).
FWIW, the Manley mentioned earlier in this thread, while an excellent amp, only has the XLR connection for convenience- despite the connector, its input is single-ended. If your source is conforms to the balanced standard (AES file 48), you may encounter a buzz with this amp.
But that is not so hard to drive and since the deep bass is handled by a separate amp, I think our MA-1 could do the job (it also is a fully differential balanced amp with a balanced input).
FWIW, the Manley mentioned earlier in this thread, while an excellent amp, only has the XLR connection for convenience- despite the connector, its input is single-ended. If your source is conforms to the balanced standard (AES file 48), you may encounter a buzz with this amp.