Any time you move to separate amplification, you're likely to see a nice improvement both on movies and on music - and since I also own Paradigm Studio 60's I can attest to how much they like the extra power that an amp like the 7125 can provide. There have also been some folks who used Yamaha receivers similar to your 2400 as pre-amps and reported that the 990 offered a definite sonic improvement, so I'd say you could find a very the 990/7125 combo to be a nice upgrade.