Try Dynaudio Audience 52 or 52 SE - both used now. These lowish sensitivity speakers seem like they would be poor match for the relatively low power ProLogue one, but they sound great together. Put the 52's on a nice stand and give them some room to breath and you will be very happy. Other options would be the Usher Be-718 (tiny Dancer) or the Focal Chorus 807V.
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Look for speakers with a smooth impedance. Based on JA's measurements of the Prologue Seven monoblock
The Prologue Seven's output impedance was extremely high from the 8 ohm tap, at 8.5 ohms at treble and midrange frequencies, and rising to 9.1 ohms at 20Hz. It was around 4.5 ohms from the 4 ohm tap, and still 2.6 ohms from the 2 ohm tap. These impedances will maximize power transfer into loads that equal the transformer-tap rating, but will introduce large variations in frequency response with real-word loudspeakers. Into our standard simulated loudspeaker, for example, there were ±2.2dB variations in response from the 4 ohm tap (fig.7), rising to ±3dB variations from the 8 ohm tap (fig.9), and even ±1.6dB changes from the 2 ohm tap (fig.8).