TD is most likely correct, but if ARC says no, then I would go w Jcarr's advice. He designs some of the best carts out there and is a frequent and generous contributor to these forums. Just make sure you use good quality resistors. But I am pretty sure you will find that you can change the resistance internally to the phono stage.
CONUNDRUM
I'm fairly new to vinyl. In my haste to put together a fairly nice front end, I have created a mis-match between my cart, phono stage and my linestage. I have a Clearaudio Maestro cart feeding a ARC PH-7 feeding an Aesthetix Calypso. The PH-7 is over driving the Caypso with no way to reduce the output without sacrificing quality of sound. (attentuators don't work. In dropping the output, they also compromise the signal quality)) I can go to a low output MC coil cart, or change one of my preamps. I'm looking for a WARM sound with all the usual qualities one would want in a good sounding system. The MC cart seems like the way to go, but the $$ keeps piling up as it so often does in this hobby. Suggestions please.