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.
Paradigm CI Pro P65 IW v2's nominal impedance level is 8 Ohms . 8 Ohms is pretty much the standard impedance amongst stereo speakers and amplifiers so Paradigm CI Pro P65 IW v2 is not considered a difficult to drive speaker from Impedance perspective.
Paradigm CI Pro P65 IW v2 has a sensitivity of 91.5 dB. 91.5 dB of Paradigm CI Pro P65 IW v2 is considered a high sensitivity compared to average stereo speaker which makes CI Pro P65 IW v2 an easy to drive from Sensitivity perspective.
Read our detailed Paradigm CI Pro P65 IW v2 Review