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.
GoldenEar Invisa SPS's nominal impedance level is 8 Ohms . 8 Ohms is pretty much the standard impedance amongst stereo speakers and amplifiers so GoldenEar Invisa Signature Point Source (SPS) is not considered a difficult to drive speaker from Impedance perspective.
GoldenEar Invisa SPS has a sensitivity of 92 dB. 92 dB of GoldenEar Invisa Signature Point Source (SPS) is considered a high sensitivity compared to average stereo speaker which makes Invisa Signature Point Source SPS an easy to drive from Sensitivity perspective.
Read our detailed GoldenEar Invisa Signature Point Source (SPS) Review