Hi folks, first post on this forum. I have a yamaha RX-v673 av reciever I have been given Samsung surround sound speakers which came part of an all in one system where the DVD player powered the subwoofer. My subwoofer is passive and I'm aware it needs to be powered by an amp to work with my Yamaha reciever. I've bought a cheap 100w amplifier from ebay item number 222780375220 if you're interested. My question is can I just use the phono cable going from the sub output on my av reciever, going to let's say the right input on the 100w amp then just use the right speaker output of the amp going to the subwoofer? I've done loads of research but my brain is fried. I'm new to home theater and im trying to do it on a budget I don't want to buy a new subwoofer I'd like to try and get my passive one working. Everything else works great and sounds half decent to say there is no sub connected. Please help me. Many thanks!