Why Don't We See More High Current Electronics?

Assumed you had some kind of passive. The 400 ohm Zout of the Cary should not be a concern even for an amp with 10Kohm Zin.

The 3.5 ohm minimum (4.25 - ultimateavmag) of the speakers isn't that critical either, unless it's coincides with a big phase angle, which it doesn't on those. In fact, they tend to be a little midbass heavy, peaking with the minimum impedance at about 90 Hz. Yes, they benefit from the bass control of a strong amp but, along with the titanium tweeter and some high frequency fluctuations (sibilance?), I think you're going the wrong way. Although, you could do much worse than the ones mentioned.

Thanks Unsound and Ngjockey. Unsound, at the time you referenced the Threshold it had a Sale Pending- I saw it before and it was Sale Pending for quite a while. I would likely have jumped on it.

Ngjockey:

From Stereophile's mearsurements of the SLP 05:

"The SLP 05's output impedance is specified as a usefully low 400 ohms. However, I got significantly higher values for the unbalanced output of 1500–1600 ohms in the midrange and treble, rising to 3400 ohms at 20Hz, with similar if slightly lower figures for the balanced output."

That seems like quite an impedance swing from the Cary. I'm not sure I would want to be married to it.

I'm not that familiar with your speakers and didn't take the extra time Ngjockey took took to consider system compatibility. My suggestion was merely based upon your posted request.

@Unsound... That's because I've been laid up and bored to tears after knee arthroscopy.