So, i have the 5.1 channel system with 3 sierra-1 in front and 2 htm-200 in rear.

Reading that Sierra1 sensitivity of 87db and my receiver Denon 4311
140 watts per channel into 8 ohms (20-20,000 Hz) at 0.05% THD, with 2 channels driven
This means that i am only giving about 28 wats per channel???

So if i add an amp like let's say Emotiva xpa-3 or -5. Huge difference in sound or just louder? Because i don't need louder. I am just thinking that with extra power these babies may open up to something much more