The key here is the speaker impedance plot:
https://www.stereophile.com/content/revel-ultima-salon2-loudspeaker-measurements
This speaker has pretty low impedance (< 4 Ohms) for a wide range (20 to 100 Hz) in the bass. This does imply that the speaker will be highly amplifier sensitive and auditioning it with different amplifiers will be helpful, or you could use it with a sub below 80 Hz.