I kicked it up a notch this evening to put the unit through its paces and see if it it holds up under some "pressure". Hugh Masekela "Hope" CD was chosen for its exemplary clean and wide dynamic range. Cranking up the sound to beyond the "usual", the drums exhibited stupendous slam, crispness and articulation. The Lamm amps hold up to the punishing 1.8 ohm dip at 90Hz that Wilson Sasha presents easily and I'd say this PurePower unit will hold up to anything I can throw at it with its 2000VA/1400w power rating and the demand from the amps.
I am happy.
Transients are crisp and well controlled but the input side of AC does dip even further than 115v
The output side is still rock steady at 120V.
Good enough for me.