Audiophilepure

https://www.stereophile.com/content/wilson-audio-specialties-wattpuppy-loudspeaker

As before, this latest WATT/Puppy remains a 4 ohm rated amplifier load and will draw significant power from matching amplifiers. (Wilson notes a worst-case load in the upper bass of 2.87 ohms at 86Hz, if over a short frequency range.) Most modern higher-output current solid state amplifiers will be untroubled by this, but with tubed amplifiers the 4 ohm output transformer tap is advised (to maintain best control of the speaker’s impedance). However, experimenting with both 4 and 8 ohm amplifier connections is always worth trying, listening for both bass quality and available loudness. And mitigating the demanding impedance, the specifications also claim a well-above-average voltage sensitivity of 89dB/2.83V/1m, with a suggested minimum amplifier rating of 25Wpc. (As we shall find, there is an additional sensitivity bonus.) In typical rooms of 2800ft³, amplifiers up to 200Wpc into 8 ohms will provide substantial and realistically loud soundfields of some 110dBA from a stereo pair.

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