Coaxial Ribbon Midrange/tweeter - Can a small midrange ribbon actually do midrange well?


Fellow Members: my apologies if you may have caught a similar discussion under Piega 511 Coax Loudspeakers. That title may not reflect the general interest I am hoping for.  

I am wondering, from a technical standpoint, how the Piega 511/711 Coax loudspeakers use a relatively small coaxial ribbon mid/ tweeter array driver to cover the entire midrange.  I always thought of smaller ribbons as excellent tweeters only.  If it does cover the entire midrange, can it move enough air to make
an impactful presentation for large orchestra or rock music, for example. Reviews praise the speaker’s agility, resolution and accuracy. It sounds like a most worthy competitor in its price range but I want a loudspeaker that can do most genres well.....not just vocals, chamber music and jazz.  Thank you in advance for your input. 
audiobrian
The Eminent Technology LFT-8b uses a pair of magnetic-planar drivers to cover 180Hz to 10kHz, crossover free within that frequency range. I ribbon tweeter takes over at 10k, and an 8" dynamic woofer at 180Hz. The 2014 Robert Greene review of the speaker in TAS is worth a read.
Interesting. I'd say there's a lot to consider.

This is a rather large ribbon. The larger the surface area, the less it must move to achieve a given sound pressure.

I will say that the masurements from the C8 LTS are encouraging. The impulse and waterfall displays show an uncommonly good time domain pattern.
The off center isn't great, and hte impedance plot is VERY interesting.

I would not say it is impossible. I am using a pair of AMT's down to about 1.8kHz and the dynamic range and power handling is amazing.
Should add, this is not the first time a planar midrange has been envisioned.  The most famous are the Infinity and Genesis towers.
Erik, I assume you meant to say "ribbon" midrange. As you know, there are many planar midrange drivers---the other Eric (with the inferior spelling ;-) .
I truly appreciate the responses so far. The Eminent Tech speakers have a much larger/longer midrange ribbon array than the Piega 511 Coax Loudspeakers. This is why I find it hard to believe this Piega coaxial driver can generate the necessary SPL for more demanding music and without distortion.