I'm using a tweak that is definitely not snake oil; High Fidelity MC-0.5 power conditioner modules. They plug into the duplex receptacles, I'm using three modules. They have added more detail with a smoother presentation, lower noise floor, and holographic sonics.
There is now a MC-0.5 Helix Plus available with increased benefits.
There is now a MC-0.5 Helix Plus available with increased benefits.