Sorry in advance for the choppy writing- I don't have the time to refine right now, but wanted to share...
I recently heard this speaker in a system with Boulder electronics, in a medium sized room. In short, the experience was a SPECTACULAR! After all the years of listening to hyped up drek, and having heard a lot of stuff over the years, very few things get me excited, and I was truly impressed.
Generally speaking, here are some of my biases: I am not a fan of box speakers, with exceptions of Vivid Giya driven by POWERFUL tube amps (probably due to its odd shape). I have also heard Wilson Alexandria sound great, and a few others, but I can probably say I would never own a reference-level, hard to drive, well-marketed box speaker (like Wilson, magico, focal, B&W, sonus faber, etc.) as long as I live.
The reason I believe an open design speaker like the Maggie 30.7 is better than a box speaker is that you can simply walk into the orchestra as it is playing!!!!
And box speakers don’t make economic sense either. People are paying gobs of money for the engineers to make the box disappear, and still, the effort is unsuccessful and hurts realism. So why bother with the box in the first place?
I have to respectfully disagree with some of the folks in this thread who believe one needs an extremely large room for this speaker. I didn’t have a tape measure with me, but I would have to say the room was about 14/ 15 feet wide and 22-25 feet long. The room had some absorption in the corners, but a lot of diffusion. (My personal bias is also for diffusion over absorption – not to deaden the sound.)
According the Maggie marketeer, who sounded much more genuine and confident (because he didn’t need to oversell) than the audio magazine marketers posing as "audio journalists", the speaker emulates a tall line source that projects a figure 8 pattern of sound, and thus can work in smaller rooms. According to him, a tall skinny pole is ideal design, and this Maggie is close.
So in addition to a very open sound, the speaker recreates a compelling sound stage with “realistic” images. The images remained stable as one moved about the room. An accomplished classical musician, who had played a sting instrument for a major symphony orchestra, had his jaw dropped and was shaking his head in disbelief. I am not a slimy, despicable, lying reviewer, just a passionate amateur. I am not exaggerating like the audio reviewers do; just reporting what I saw heard.
Comparisons: The 30.7 has much better resolution, dynamic range, and jump factor compared to other smaller Maggie models I have heard.
It didn’t have the magical midrange of a soundlab or resolution of an electrostat, but was much more dynamic, with a lot more bass oomph and beitzim than any electrostat I have heard. And although it didn’t measure up to a stat when it comes to resolution, the Maggie 30 resolution was outstanding, yet it was non-analytical compared to magico/ most SS amps or Wilson with most ss amps, which have too much resolution for most people that turns the listening experiences into an exercise of clinical analysis or recordings. (The Maggie design is trying to emulate electrostats in terms of low mass.)
It rocked great. But it can’t rock as well as $999 Zu Omen dirty Weekend, with a flea-powered SET amp. It is not as open or dynamic, and lacks the 3D effects , texture, and smoothness of an MBL 101. (But MBL won’t image as well, in fairness). And I wasn’t emotionally pulled into the music as immediately or as deeply with high-efficiency speakers that just channel emotion above the audiophile vocabulary.
Yet a great Speaker! Even if you can’t afford it or don’t have the place for it, still hear it! If you own an expensive Magico, Wilson, Focal, etc., trade down!!!