I saw Colin's K15LF freq resp graph below. He indicated that he received it from a DIY buddy at Eminence. The graph on the Em website doesn't have the peak but they both show that the sensitivity is ~95dB (where did they get 101dB for the spec sheet?!?) As Wayne points out, these graphs aren't very consistent so maybe the actual response lies somewhere in between?

I guess we'll have to trust our ears.

Good luck with the Pis. Let us know how it turns out.

Cheers,
Jeff