The red curve is the Listening Window and the blue is the Sound Power. The Listening Window is 0 to +/- 30 degrees horizontally (phi plane) and +/-10 degrees vertically (theta plane). The Sound Power is a weighted mean of a number of curves: Axial Response, Listening Window, and Early Reflections.
I don't think Ian has ever said publicly what the angular resolution of those measurements is. And for all I know, Axiom may extend these curves beyond the nominal angular ranges I've described. The weights for the Sound Power are Axiom secret sauce.
The recipe is right below. You and your whole family can sing it to the tune of "We Three Kings from Orient Are":
We six curves of Axiom are
30 years old we've come so far
every one eighteenth pi rad, an anechoic curve we add
of spinorama data not scalar.
Refrain:
O curves of tone and SPL
curves with similar shape and flare
gentle slope, low Q nope
perfect sound these curves foretell.
Direct sound real flat without any gain
"Axial Response" that is my name
simple content, most important
over all curves I reign.
Repeat refrain
A "Listening Window" nine curves mean am I
0 to +/-30 degrees across, 10 degrees down, 10 degrees high
within a dB, these curves must be
for listeneners to joyously sigh.
Repeat refrain
Image width, stability, timbre to tame
+/-40, 60, 80 across and 50 down and high's the game
most that we hear, bounce from quite near
"Early Reflections" is my aim.
Repeat refrain
A speaker's signature doth we take now
weighted mean of 70 curves is how
downward tilting, no broad wilting
"Sound Power" curve art thou.
Repeat refrain
The "DI" curve is the cash cow
the "Listening Window" from "Sound Power" take away now
closer to zero, it's a hero
listeners will procalaim a big "Wow!"
Repeat refrain
One last curve is for finesse
"Early Reflections" from "Sound Power" we minus
lateral prophylaxis, from far-off axis
"Early Reflections DI" shows polar bias.
Repeat refrain
Low DI with curves smooth and similar
disperse the sound as not to be insular
audio pornography, via sonic holography
sharp images spaced out renders them singular.
Repeat refrain
Axiom's direct radiators sound great when they're played
sound power declining 3dB per decade
if that DI, is a bit high
constant, low DI LFRs can be yours via trade.
