It appears your preamp output impedance is on the high side at 1.2 Kohm but I would be more concerned about the preamp gain. You better look for an amp with input gain control or better still go with some other preamp if it is not too late.
Audible Illusions M3B with Aragon amp?
About a month and a half ago I ordered a new M3B (was told I'd have it in 1 1/2 to 2 weeks - still hasn't been shipped!) and I'll be using it with an Aragon 4004 mk ii amp, along with some fairly low efficiency (86db) speakers T+A Criterion 300's. The Aragon is kind of low impedance - 22k - and I'm wondering whether this'll be an ok matchup or if I'll have to start shopping for another amp? Any opinions or experiences?