How to read speaker sensitivity rating?

The Zu's would be a much easier load for your amp.
And the Dominance is a dream speaker. I envy you.
You will also love the crossover-less design of the main drivers. They should be a move in the right direction for you.
John

Viridian also noted that phase angle will make a difference and maybe more than impedance magnatude. Of course, the amp killer speakers, no matter the sensitivity, have low impedance and adverse electrical phase angle in the upper bass, where much of the energy is. They are the gas guzzlers of the audio world and will suck current out of an amp like there's no tomorrow.

Will someone please explain "phase angle"?

FWIW, when a speaker's specs include both its sensitivity and its power handling capability, it allows the user with a similarly capable amp to estimate how loud the speaker will play safely and continuously. For example, ratings of 87dB and 150 Watts translate to a maximum volume of just over 108 dB, earth shaking but not shattering.

Just my two cents, Mitch, but at 40k for the Dominance, shouldn't an audition trip to Utah be part of you plan? Or does Zu's generous return policy apply to the flagship as well?

John