For easy to drive speakers, say high sensitivity 90? and 8 ohm or higher one can use even a flea watt amp for great success. A great many horn loud speakers (Klipsch and Volti Audio) sound terrific with low watt amps. I have that EXACT amp (LM audio 216ia) and driving Vandersteen 2 CE Sig II speakers at moderate volumes and it sounds great to me. I think in your case, an amp with quality watts (more than you have), would most likely make your speakers sound better, but only if you play them loud. I would think your amp is just fine for those speakers...but only you can be the judge. Do you have a quality source, good room acoustics and damping?
Does my amp have enough juice to power my speakers?
Having just read a review in Stereophile of my Audio Physic Step Plus speakers (which I have to my utter dismay ,knocked over and dinged AAAgh!), the author states that his Shindo Haut-Briton Power amp (20wpc) couldn't drive the Step Plusses and states that nothing less than 35Wpc could drive them. My dilemma is that I have a Line Magnetic 216 IA rated at 22Wpc that sometimes sounds heavenly and on other days sounds eeh. Do I need an amp with more boost?