Plus, it's a Class A Stereophile-rated component. Its phono stage accepts both MM and MC cartridges, it has a built-in DAC, AND it has analog bass management. Add a subwoofer to your MMGs, use the bass management to route the high pass signal to the MMGs, and they will sound twice as big and dynamic.
True, $2495 is a bit of money, but it's by far the least expensive Class A component in Stereophile's list of recommended integrated amps. Plus, you will get much better sound and way more gain than you can get from your present setup. The Adcom 555 was a good value for its time, but this Parasound will redefine *your* sound, and your passive line stage is *literally* not helping.
Also, to save some money, get AA's sale-priced demo.