I just got a pair of RTi 12s and a PSW1000 sub. I connected the sub by using Y connectors out of my pre amp to the Line In of the PSW 1000. So far that is the only connection method I have tried. It seems that I have to adjust the sub filter and sub volume from source to source. It also needs attention depending on the type/style of audio I am listening to and the overall volume level. I wasn't really expecting a complete "set it and forget it" arrangement, but it seems to require constant fiddling with the sub settings or it produces bass that is not well blended into the audio, sounding punchy as if there is a portion of the low frequency band missing between the sub's output and what the mains produce. I set the filter higher and adjust the volume to correct that. Then a different track can play or I can put in a different CD, for example and it's like the sub isn't even working. I have to crank up the sub's volume. And no, I am not a setting fiddler by nature! When it's "right" it is absolute sheer audio ecstasy that can nearly bring me to tears! :p :p :p Well, maybe not quite to tears... BTW: All the speakers on the 12s are operating, e.g. not bi-amped, subs connected.
My previous sub was a passive unit, 15" down firing, wired with the amps' feeding the sub and the main speakers fed by the sub speaker outs. It was the only available way to connect it. It only needed a notch or two of bass from the preamp at very low volumes.
I want to try the amp wired to sub speaker inputs and the main speakers from sub speakers out arrangement, but it would seem that as it is now is the best way to go. Because running the wires is so labor intensive I'd like some input on this before going through the effort. Opinions/suggestions please?