Hi guys, about a year ago, i had a Bookshelf system by Sony burn out on me, it came with a subwoofer that i took out(the actual speaker). It's a 120 watt speaker, 6 ohms @ 60Hz (I have no idea about the voltage, or amperage, and I googled and wasn't able to find anything else). I now have a Sony receiver, and would like to see if I can buy some kind of an amplifier to power this sub-speaker. My receiver only has a Subwoofer Out(looks like a normal RCA-type cable) for an Active Sub. Is it possible to buy some kind of an amplifier that will be able to power the speaker? If so, would this be cheaper then just going out and spending 100 on another sub, and throwing out the speaker I have? I'm not very familiar with electronics, any help is appreciated, thanks!