Will this sensitivity for a MC input on an amp be enough for my cartridge?

You will be fine as far as volume goes. But in all other respects you will probably be very disappointed in the sound. Its just very hard to believe the built in phono stage will be anywhere near PH6 level. 

OMG just had a look at that monstrosity. Scratch "probably" you WILL be disappointed! That thing even has a DAC in it! Noise is death to phono stages. Sorry. For less money you could get this use the PH6 and walk all over that Mac https://www.ravenaudio.com/product/reflection-mk2/

what miller said

arc ph6 will not be matched for sound quality by a phono stage in a mac integrated

not even in the same zip code

McIntosh are bought only for the aesthetic appeal not for how they sound!  LOL

@bestgroove

McIntosh are bought only for the aesthetic appeal not for how they sound! LOL

that statement is a little strong, but certainly macs are designed for eye as well as ear appeal... no denying that... such is true for many a high end hifi brand...

Right. McIntosh aren’t just bought for the blue lights. Don't forget name recognition.

Macs are sturdy and reliable. Bruce you will be fine. Enjoy your new unit.

I have the McIntosh C50 preamp with phono and it's decent but i just bought the PS Audio Stellar phono stage and received an immediate upgrade in sound.