McIntosh MA6300 headphone output

Hello folks,

I'm considering buying an used McIntosh MA6300 amplifier. It's not a very powerful amp but I'll use it with Focal Electra bookshelves on my desk when I'm using my computer (yes, I like high end sound even when I'm working on my desk).
Actually, my question is not about the sound this amplifier gives with speakers, but about its headphone output. I'm a headphone lover and I own a very high end tube amplifier. I currently also use a Nad 304 amp for my Electras and I love its headphone output, very powerful and great sound. I can even drive my LCD-4 and my Abyss with it, the sound is not as great as the best amps but it rocks.
I found almost zero information about the headphone jack on the MA6300 (and on other McIntosh amps by the way). Is it powerful enough to drive the LCD-4? (It's my currently favorite headphone, not a problem if the Abyss is not supported). Does it give a good sound? Does it take benefits from the preamp section of the McIntosh MA6300?
The purpose of this purchase is of course to have a great amp for my speakers, but also a good solid state headphone amp at the same time.
Any info would be highly appreciated, even if you don't have the MA6300 but a close brother of this amp in the McIntosh line.
Thanks!