There are two main factors that set how easy or difficult a speaker is to drive, these are Speaker Sensitivity and Impedance. A speaker rated lower Ohms requires more current than a higher Ohm speaker. Similarly, a speaker with lower sensitivity requires more power to reach the same volume as a speaker with higher sensitivity.
Revel W253L's nominal impedance level is 8 Ohms . 8 Ohms is pretty much the standard impedance amongst stereo speakers and amplifiers so Revel W253L is not considered a difficult to drive speaker from Impedance perspective.
Revel W253L has a sensitivity of 91 dB. 91 dB of Revel W253L is considered a high sensitivity compared to average stereo speaker which makes W253L an easy to drive from Sensitivity perspective.
Read our detailed Revel W253L Review