Ok, I hope I can explain myself clearly here: I have an older pioneer vsx456 receiver and tower speakers with 12" woofers hooked up to it. I recently got a new sub. I want to hook up the sub so that the sub will play the frequencies in accordance to where I set the LPF on the sub AND so that the main speakers will still play all there normal frequencies. Does this make sense? Im trying to sort out the differences between using speaker level and line level connections. It seems that the line level connection is the way to go. So if I hook up my sub to the sub pre-out on my receiver what exactly will the receiver do? Does it have a LPF in it and what is it set at? The receiver's manual is no help here. Also, once I hook up my sub to the pre-out on the receiver, will the reveiver automatically stop sending my front speakers low signals and redirect them to the sub. Can anyone shed any light on this. here is a quote from an article I just read: "Your receiver or pre-amp will have at least rudimentary bass management features if it has a subwoofer output as yours does. Depending on your unit, you may be able to (1) send all bass frequencies below 80 Hz (or another cut-off you set) to the subwoofer, (2) send bass frequencies only to your main speakers (do not use the subwoofer at all), or (3) use both the subwoofer and your main speakers to produce bass frequencies below 80 Hz at the same time. Any receiver or pre-amp will allow you to use option 1 or 2 above. Be sure that if you do have your system set to route all bass to the subwoofer that the subwoofer is set up properly (connected to the proper output, powered on, set at the right volume level). Your receiver or pre-amp may or may not let you send bass signals to both a subwoofer and your left and right main speakers; check the manual that came with your equipment to find out about your particular model." what I want is (3), is that possible?