My first year of college I bought a couple of speakers and subwoofer off of craigslist for like $100. The speakers are the Infinity IL10 model. The subwoofer appears to have its own amp built in and each speaker is rated at an impedance of 8 ohms and 50-150 Watts. The preamp I'm currently using is the Pyle PFA200 with a total power output of 60 Watts. It says the impedance is rated for 2-8 ohms. The subwoofer gets plenty loud, but I'm looking to get a little more sound out of the two speakers. I don't know a whole lot about amps and speakers other than that the impedance should match up. Does anybody have any recommendations for another amp to buy to make the speakers a bit louder?