The new AC1 power cord has made 'very' significant improvements in all areas of the sound. This is on top of the Equitech 2Q balanced power and the MIT Z Stab ll already in use for my amp, each of which provided very significant & complemetary benefits(common & differential noise). Previously I used the unfiltered Oracle AC3 which certainly improved the 'breatheability' and natural flow of music from my 200 watt amp. Ths Oracle AC1 simply 'removed' previously unheard weaknesses in the system - it's like an entire "system" upgrade,- even to the speakers. Dramatic refinement. Power & delicacy. If you have a big system these Oracles are certainly worth an audition.