Using McIntosh MC352 amplifier + C2300 preamplifier (similar to your gear), I tried several things in this order. Each step improved the sound, in my opinion:
1. Richard Gray 400 power conditioner.
2. Dedicated 20 amp lines (2) + PS Audio outlets.
3. PS Audio P10 power regenerator (replacing the Richard Gray 400).
*Note: all gear now plugged into the P10, including the MC352 amplifier.
**Note: Biggest improvement came with dedicated 20 amp lines, which removed system noise (via phono).
1. Richard Gray 400 power conditioner.
2. Dedicated 20 amp lines (2) + PS Audio outlets.
3. PS Audio P10 power regenerator (replacing the Richard Gray 400).
*Note: all gear now plugged into the P10, including the MC352 amplifier.
**Note: Biggest improvement came with dedicated 20 amp lines, which removed system noise (via phono).