Charles,
I haven't kept up in recent months, (maybe years) with ALL of the Maggies.
But I am pretty sure that virtually all the Maggies state a 4 ohm load (easily checked on their site).
This has to do with the 'nature of the beast'.
I believe, and this is pure speculation, that the, 'they're hard to drive' comes from several aspects of their performance. They are very low distortion loudspeakers, and as they go up in volume, don't have the normal, (out of gap) distortions that traditional loudspeakers offer up.
(IE, as we move the coil further from the magnet, the emf is less and less, therefore the 'control' exercised over the driver is lessened)allowing for exponential distortion levels. The human ear while aware of distortion is possibly distracted by the volume, and not as aware of it.
For example, the typical loudspeaker woofer, even at modest excursions can deliver as much as 10% distortion very, very quickly. THAT is a lot. The Maggies, are lower in distortion AND lack the overall 'kick' or 'punch' to most ears, that traditional loudspeakers have. This lack of kick causes the listener, craving that punch, to turn up the volume, possibly louder than is called for. When the amplifier clips, the listener is immediately under the assumption that it has to do with 'inefficiency' rather than the reality of the situation.
As a dipole speaker, the Maggie is loading sound into the room in a completely different manner than 'traditionals.'
In phase to the front, out of phase behind the speaker...but energy into the room nonetheless, so one could argue that the traditional, 2.83V 1W1M measuring techniques are inadequate to really assess. I've always thought this measurement, while the standard, is static, and not indicative of what a speaker actually does with a 'dynamic' or 'music' signal--and only a laboratory tool.
Sorry, off topic.
Suffice it to say, the Maggies are special and worthy of ANYONE'S audition if size is not a deal breaker. With their overall attractive presentation, it isn't for me, but then I'm not a decorator, or a wife fighting for room space.
If you have any further questions, you can write me off site at lrsky@insightbb.com, or through a'gon.
BTW, your system, I'm pretty sure, based on a cursory look, is VERY sweet sounding.
Good luck, Charles.
Larry