For test setup, procedures, and information on how the data was obtained see sticky here:
http://www.mobilesoundscience.com/f11/driver-testing-methods-setup-frequency-response-harmonic-distortion-693/
Do not ask setup questions in this thread. This thread is only for driver discussion.
To understand how to read the data, try here:
How to read Frequency Response and Harmonic Distortion Plots - DIYMA.com
Driver Tested:
Scanspeak 18w/4531g:
[no pictures taken]
Impedance and T/S Parameters:
Frequency Response at 0 degrees, 3dB scale:
Frequency Response at 0, 15, 30, and 60 degrees, 5dB scale:
Harmonic Distortion at 95dB:
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