Tim,
If I may suggest you might try adding a power conditioner. Monster Cable makes several to choose from, and even a cheap conditioner will make a substantial difference. You may also discover that cabling will make a more profound difference than you think. Personally, I'm not familiar with Maggies but if you present fellow Gonners' with a target price point, I'm sure there are several who can offer thier experience.
Happy Listening,
Damon
