The sub can be connected using a rca cable from the amp/recvr sub out which would be line level...or run speaker cables to the sub as if they were the main spkrs...and then more spkr cable from sub to spkrs themselves. That would be speaker level. There is no right or wrong way but rather an ideal way based on your ability or there lack of to control the xover freq. Your amp may or may not have xover freq control...chances are it does not if it's a stereo amp therefor you will want to engage/turn on the subs xover switch and use dial to blend mains with the sub. Say you are using some monitors that are capable of 55-60hz lowend...set sub xover at or about that freq so it takes over where the monitors ign off so that there is a smooth transition. I think this is what you are inquiring...I think.
Connecting a subwoofer.....
What is the difference between using pre-out (if your amp has one) and using line level outputs when hooking up a sub in a two channel system for music only?I know there are a lot of "do's" and "dont's" when connecting a sub and it all has me a bit confused. For instance, I just read someone recommending using a "Y" splitter for the cables and Simaudio told me this morning that if I were to attempt this it would definitely damage the amp.