What are the specs of a full range speaker?

No single transducer can handle a full 20 to 20khz frequenc. In the olden days, acceptable single driver to wideband drivers, typically covers from above 50's to near 16 khz signal, something that specs out like 80-16khz, or 70-15khz, enough to have a crossoverless mid; and no associated phasing problems than typical designs that employ crossover. Some people attest too that these driver units are better off partnered with tubed electronics. System integration? most likely.

A speaker that has strong output at 30hz may not be truly fullrange but is plenty of low bass for most music.

Room lock and room shudder are a couple of terms I like to use...room lock sets in around 30hz (or so) as you feel the bass grip the room, we've all felt it I think...feels good.

Room shudder sets in a bit below room lock and can cause the whole room to literally shudder depending on how strong the output is...mostly movies and some New age music come to mind.

Dave

The Apogee Scintilla does 20Hz to 20Khz. There must be others.

Stereophile ranks (in thier component recommendtions) speakers as full range if they are relatively flat from 20hz to 20khz. They have a second category for those that do not which includes speakers which have a 30hz to 20hz response. At least they did when I subscribed some years ago.

However I agree with Sogood51, a speaker which is spec'd out as flat to 30 hz produces a lot of bass and you may not miss that last part of an octave much.

A speaker which "reaches down into the 30's" is sort of a meaningless description. What is important is the rate of fall off when it hits its lowest 'flat' output. For example - flat to 60hz could still have some minimal output in the 30's but it would have little impact on the sound, whereas a speaker which is flat to 45hz might well have, depending on the speaker/cabinet design, a -3db frequency response of 35hz +/- which could be quite respectible, depending on the size and dimensions of your room.

"Full range" gets abused because it sounds nice but here is a reasonable practical check: Whenever a company feels the need to employ two or more driver to reproduce music, then none of them was not full range.