OK these will help, first off the RA165.16 (16 ohm ) Driver
Test conditions
Fundamental, Harmonics, and Rub&Buzz, were measured using a 1/12th and 1/3rd octave sweep from 20Hz to 20kH
The impedance was measured using a 1/12th octave sweep from 20 Hz - 11Khz at 1.3 VAC.
All measurements were made inside a test box with an apparent volume of 645.7 litres, with the microphone placed inside the box, .33 meters from the loudspeaker.
GRAPH LEGEND
GREEN = Fundamental Frequency Curve (Fundamental vs. Impedance and Fundamental + Harmonics Graphs)
DK BLUE =Impedance Curve (Fundamental vs. Impedance Graph only)
LT BLUE = Rub&Buzz Curve (Rub&Buzz Graph only)
RED = 2nd Harmonic Curve (Fundamental + Harmonics Graph only)
WHITE = 3rd Harmonic Curve (Fundamental + Harmonics Graph only)
The Fundamental vs Impedance graph and the Rub&Buzz graph are curves of all 20 speakers in the batch.
The Fundamental vs Impedance graph is a curve of one randomly selected speaker from the batch.