horn with field coil compression driver for 30hz-15kHz

What kind of horn and what kind of compression driver could together cover at least 30hz-15kHz?

How large would the horn need to be?

Would it be possible to design a horn for the Line Magnetic 555 (a 16 ohm field coil compression driver that runs on DC 7V/1.5A) so that it could cover such a wide frequency range?
 
Bass is a much different story with horns.
And no, one horn cannot cover such bandwidth

InlowSound website always a fun Read
Spiral Horn should give you a idea
what it takes to get bass.

For what I remember 555driver 60 to 80 Hz is about lower bandwidth
something realistic with low distortion octave or 2 above that. 100/200 Hz lower limit

Larger horns have lower response but directivity increases at higher frequency.
Would take multiple horns to cover such a wide bandwidth

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TNT

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Singularis "Driver" as in one (1) driver?

A back loaded horn make about 3 octaves - thats math (more or less). So either 30->240 or 1,88<-15k.

Thats it really - it is not possible - if you want any of the desireble horn characteristics. Of course you can force it but it won't be good. It has noting to do with the driver, this limit is solely in the horn (the acoustical impedance transformer)

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TNT

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Thanks! Where could I read about why a back loaded horn cannot cover more than 3 octaves?

Looks like there are single horn and single driver (but not compression driver) that covers an even wider frequency range, for example
http://charneyaudio.com/the-concerto.html
That horn is front loaded - the bass bass horn support of about 3 octaves - the rest comes from an ordinary driver as if it was sitting in a box (more or less...)

I cant describe the math but please try to make a horn in Hornresp that is wider than 3 oct.

Discussion here: https://community.klipsch.com/index.php?/topic/152181-the-three-octave-rule/

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