I have no idea what you just said but ok. I'm guessing you mean run speaker wires from the amp to the high level inputs on the sub and then high level output from sub to speakers, but I read somewhere that that configuration doesn't give the sub its full potential like hooking it up via RCA cable, like "line out" stereo-to-RCA cable.
Edit: After a little more thought I'm guessing you meant run speaker wires from the amp to the sub and speakers at the same time which would be parallel, or amp to sub to speakers for series. Whats the difference between the two? any sonic difference? i just want to be able to pair a sub to them without having to sacrifice bass quality by using high level inputs and outputs. Atleast I think that would stifle some bass quality as far as I know. I could be wrong though.
Yes I meant speaker level connections.
Parallel means the speakers still get full range as does the sub and you use the sub LPF xover to limit its range.
Series means the sub gets full range which you limit with its LPF, but the speakers bass is limited based on the subs HPF setting. This can potentially degrade the sound quality of the speakers b/c you are running the subs passive network in series with it.
You really need to try both methods to determine what sounds best.
Either configuration will still allow you to achieve the fullest potential of your sub as if it was being connected line level. The only real difference is you are now using the subs LPF instead of the LPF typically found in A/V receivers.