The acoustechs are way louder but without harshness. Very clear and precise. I loooove them with music. I love those horns!!! I listen to mostly trance/house and these speakers in stero fill the room easily with sound. The sub integrates much better with these as well. Just watched From Dusk till Dawn and that rocked!!!! Next up, The Temple of Doom, looove vintage movies. Cant wait till Kong komes to dvd!!! Thanks Buckeye!!!! The primus sounds good but when compared to the 75's theres no comparison. The infinity just seems muddier, less pronounced. Those 75's are just clear as day. Cant wait to get the center, that will really make the difference. Gotta re tweak my setup with my Avia disk... then well see what they really sound like. Right now I havnt changed anything. Would anyone like to see the pics of the front I had? What I upgraded from? hehhe its funny.