I haven't ever listened to Zu speakers, and I couldn't find published impedance curves or other measurements for the Omen models. But based on the specs and on what I've read about them over the years I'd expect them to be very versatile with respect to choice of amplification, while at the same time being revealing of the intrinsic sonic character of the particular amp.
Also, some of the Omen models have 12 ohm nominal impedances, while others are rated at 8 ohms. And while solid state amps will typically have maximum power capabilities that are close to 1/3 less into 12 ohms than into 8 ohms, given the high efficiency of those speakers that won't usually matter. I suppose, also, that from a sonic standpoint there may be some cases where a 12 ohm load might be less than optimal for the 8 ohm tap of some tube amps.
Best regards,
-- Al
Also, some of the Omen models have 12 ohm nominal impedances, while others are rated at 8 ohms. And while solid state amps will typically have maximum power capabilities that are close to 1/3 less into 12 ohms than into 8 ohms, given the high efficiency of those speakers that won't usually matter. I suppose, also, that from a sonic standpoint there may be some cases where a 12 ohm load might be less than optimal for the 8 ohm tap of some tube amps.
Best regards,
-- Al