Not so much from the Oyaide Outlet strip. Don't get me wrong, The MT-UB w/2 R-1's inside helped. But not near as much as Al Sekala's (Audio Asylum) parallel filter. It consists of three cap/resistor combos in parallel. The first is a .47 X-rated safety cap (use nothing but X rated safety caps ) going from the AC hotside through a 120 ohm 1/2 resistor to neutral (ground not used) then two more of these with a progressively smaller value cap (.33 then .22) each connected to neutral through their own 120 ohm 1/2 watt resistor. All three of these are in parallel. This made a much bigger improvement and especially in terms of removing HF grunge. In removing the grunge the HF is not reduced. My sytem seems a tiny bit brighter but oh so much more defined and real in the HF as well as much less fatiguing. Mouser has the parts (by Vishay). It's less than $20 for enough to build two of them. I went for the axial style 10% tolerence caps, the best of the safety caps. I also went for Vishay metalized film resistors. Al is now saying a 100 ohm resistor may be a better value, I haven't tried that yet.