Revel Ultima Salon 2

Response curve is an average of five measurements:
on-axis, 15 degrees left and right off-axis,15 degrees up and down off-axis

On-axis, 15/30/45/60/75 degrees off-axis responses

Total Harmonic Distortion

If objective measurement can account for most of audiophile-level listening pleasure, Ultima Salon 2 is clearly a perfect loudspeakers for home hifi: wide frequency range, flat free-field response, good directivity pattern, and very low distortion over entire frequency range.

Source: http://www.soundstagenetwork.com/measurements/speakers/revel_ultima_salon2/

Infinity Prelude P-FR

These loudspeakers have not only very good characteristics - flat on-axis response (as well as listening window average) and gently upward DI - but also very deep bass extension. Truly full-range.

Source: http://www.homecinema-fr.com/forum/materiel-haute-fidelite/jeu-des-4-enceintes-inconnues-t29979561-15.html