TLS Guy - you seem like the type of enthusiast who would appreciate the more comprehensive and detailed set of specifications we offer on the M-series. Please contact me at
edm@svsound.com and I'll give you the PDF documents.
We include detailed build/design specs, and also the Z-curve (impedance/electrical phase), on-axis FR (with tweeter hi-pass and woofer low-pass), and horizontal polar response at 15/30/45/60 degrees.