What are the specs of a full range speaker?

Bartokfan, any speaker that can fulfill the music demands of the genre you like is full range.

Still, there is something hair raising about 18 - 29 Hz, If the room is accommodating. There is a surprising amount of music that dips way down, like Laurie Anderson's Monkey Paws, or almost anything by Bjork.

Even a grand piano's lowest key vibrates at 27.5 Hz (A0). To reproduce a grand piano's full voice your speakers need to be flat through 27.5 Hz. Also, whatever driver is producing the low octaves needs to be fast, in order to sound realistic.

My Scintillas flat line through 20Hz, way into sub woofer range. I once ran a Stereophile Test CD's frequency sweep on my system. The first clue the CD was running was when CD cases started falling out of their stand onto the floor. The tone moved up the scale seamlessly to out of hearing with nary a waver.

Tvad why would you be "more likely" interested in a speaker that goes down to 25hz /model A slightly less interested in speaker B that "only" goes down to 30hz. Like someone mentioned the most important factor is how well does the speaker perform in the CRITICAL MASS AREAS of 30/35hz through 15K/18Khz. The woofer than may go as low as 25hz, might not meet the midwoofer/midrange "as seamless" as does the 30hz woofer.
I don't place as much importance to the 18K-20Khz area as well. Considering orchestras offer little in term sof above 15K hz;'s. But in jazz/bules its nice to have a clean vivid 18Khz voice.

I question the validity of supertweeters. If your speaker is a good one, and flat lines up to at least 20 Khz, then, it seems to me, in the audible range, the supertweeeter is merely doubling the speaker's high frequency output.

These ultra high frequencies tend to go unnoticed when in balance. Emphasizing them will produce an upward balance that seems more airy and alive, but does not correlate with real music IMO.

Mural I just googled Scintilla, and came up with Apogee Scintilla Sterophile review by AHC. Once agin I do not understand much of what he is saying, and hardly believe a word on the things i do understand. Once agin audio reviews are near worthless. btw I do not like ribbons/planars/panels at all, none whatsoever. I could care less how low they go, the overall image doesn't work for me. I'm strictly a traditional cone affeciando.

supertweeter = superhype. Suupertweets are good for HT sound effects, nothing more.