Setting up dual subwoofers to a two channel amp.

Thanks for the response. This makes sense. It doesn't sound like you are having a lot of luck with integrating your subs. Another option I am looking into is using Y cables at the sub from the main amp to the sub and the the Y cable continues to the full range speaker. Nothing from the high level out of the sub at all. I don't know what kind of load this will present to the amp, though.

We need to clarify. When you say high level do you mean speaker level or preamp level?

From your last post it sounds like you are considering running the speaker hook ups on the amp to the "speaker level inputs" on the sub and then from that spot continuing on to the speaker. If so than the load presented to the amp is negligibly different as the "speaker level in" on the sub does not really load the amp per se.

If my description of your intended hook up is correct than what you will be doing is running your main speakers full range and augmenting the bass with your subs.

Is that your intention? If so I have an alternate hook up that is easier. Basically you use your existing speaker wire as you have it now and add a smaller gauge wire (as it will not be carrying any current) from the speaker hook ups on the amp going to the "speaker level in" on the back of the subs.

BTW, I am currently running my main speakers and SET full range and using my subs to augment everything below 80hz.
The only reason I am trying to add an electronic crossover is so that my SET does not have to work as hard when playing loud.

HTH

You are exactly right and articulated my previous statement much better than I could. One question: you mentioned that none of your bass augmentation has been satisfying. Including this method of adding the sub on top of the full range? Does this method we are talking about have a bad effect on the full range sound? Also, does adding a sub in the manner we are describing make the main amp work harder than if there were no subs at all? Thanks for your help in this!

In addition, would I be correct in describing the alternative method you mentioned as having two sets of wires running from one set of speaker posts on my SET? One set to the full rangers and one set to the speaker input of the sub amp?

"Does this method we are talking about have a bad effect on the full range sound?"

IMO, No if you can get it set up properly. Possible issues that may come up are; any overlap of the main speakers and subs as well as phase issues at the crossover point.

"Also, does adding a sub in the manner we are describing make the main amp work harder than if there were no subs at all?"

No. What I was talking about is in a true biamp set up (active crossover before the amps and sub's) I'd be removing the deep bass, below the crossover point, from the main amps. Simply put this would remove some of the demands on the amp since the bass requires much more power than the mids and highs do. My main speakers would also perform better as they would no longer be asked to do the deep bass.
The system would be able to play louder with less distortion. However in my case the quality of the mids and highs are negatively impacted by all of the active crossovers that I have tried so far. So I am running the SET amp and main speakers full range and using subs to augment the bass the main speakers can't do. After much "dialing in" the set up I am very happy.