The Minx line is incredible sounding, what they do above 120hz is rather astonishing for their size. I haven't heard the Orbs but Perpendicular had some and had this to say:
Originally Posted by Perpendicular
I agree with this assessment. The law of physics are just that, but the BMR driver in the Min 10/20 are special. In the last decade, I've gravitated towards smaller satellite designs because many brands have gotten better. The Orbs were a great speaker and I still hold them in high regard but being almost a decade later with no changes to the little Orbs, I wanted to try something different. I would think they would have improved on that 3" driver somewhat. There has always been that ceiling where they could not hit on the higher end of the spectrum. This was a bit bothersome for me. With that in mind, the law of physics came into play, and I wanted more sizzle, dynamics, better midbass, etc. So, I ended up with bigger speakers that were great with movies and so-so with music. Choosing the Minx was a great move for me because I found a lot of the qualities that I admired about the Orb's and Anthony Gallos satellite speakers plus the highs are back and there are dynamics (I kid you not!) that I've never heard in a small driver, let alone, a 2 1/4" one. The BMR driver is REALLY different. I feel, the statement, from one of the sellers of the Min 10 (Audio Advisor), states it perfectly:
"You've probably never heard such accuracy, detail and realism from a speaker as small as the Cambridge Audio Min 10 satellite. It's just over a mere three-inches square. But despite its miniscule dimensions, the Min 10 satellite offers wide dispersion and beautiful sound."
They have similar qualities but are different from one another. Since, it's been over a year since I've had the Orb's, I'm going by memory. As I already stated above, what hit me right away was the difference in the treble region and dynamics, when comparing the two designs. Also, I noticed how clear the sound is to any loudspeaker design I've own. I don't have to strain to hear dialog in a movie without having to turn the center channel up, the lyrics to a song and how each instrument is separated from one another. This speaker has depth. Everything is placed on stage in its proper dimension. Scale can sometimes be a tad small. It's NOT an "In Room" soundstage presence. You feel like you are sitting a few rows back from the stage, NOT on top of it. Also, with the Orb's, I felt like I needed rear speakers. Not with the Minx.
That's not to say you wouldn't prefer the Orb's you should listen to them if you have the chance, just that I want to make sure you aren't swayed away from the Minx unduly. His post was in reference to the Min 10s, the Min 11/21's are a significantly improved design on top of that. I have the 21's and 11's and I'm extremely happy with them for what I expect out of them.
Otherwise I'd add Anthony Gallo, KEF, Monitor Audio or perhaps something like the NHT SuperZero's if you want just a little bit bigger speaker that sits somewhere between sat and bookself. And as pmanyon said, with any of these, you'll need to have a sub that reaches up there. I really do like the style of the Gallos and Orbs though