Subwoofer connection to older tube amp

So just connect the sub wires to the same amp terminals as the main speaker wires?

Thanks guys. Didn't think I could double the speaker wires on the same inputs but makes sense now. Appreciate your help.

Right on. Thanks again for your help.

Thanks Sfar. If I can just run parallel wires off the same amp out connector that sounds easiest.

I appreciate Steuspeeds directions for using the line level outputs but as long as there isn't a real power drain on the D-90 and the sub amp is being used I'll do the joint speaker wire set-up.

OK, but I'm still not sure what line level connections I have on the pre or the amp. The pre may have those but the amp really just has screw posts for speaker outs at different ohm levels. The only RCA style inputs is the Main for the pre input.

The sub has RCA line levels connections but not sure about these older tube electronics.

Thanks again Sfar. My pre-amp is basically as you state. It has the main line level outputs(RCA) for the amp plus the RCA style tape output. So your saying that I can't use the "tape out", that I would have to split off the main out with one set of connectors going to the amp and the other to the sub?

I use a pretty high-end output cable between the amp and pre so I'd have to use a splitter thats a little better than Radio Shack quality to not diminish the connection to my amp.

I do want to use the amp in the sub since its 1000 watts and designed for it. If I just double the speaker wire connections off the amp- one set to main speakers and the other set to sub, it seems it would defeat the design of the sub and may overload the amp.

So if I just go with the doubling of the wires off the same 8 ohm speaker output directly from the amp I'll be fine? That would be easiest and I wouldn't have to go out and buy more connectors.

Also, do I need to run left and right wires or just a single? Right now I'm using an A/V receiver that has the single RCA Sub output and its connected to the left input on the sub. Now I want to switch back to using my Audio Reserch gear. Do I need L&R or just go with one speaker wire off the ARC amp to say the left speaker sub input?

Ok, I called Audio Research and talked with Leonard in the service department. I think he's been there forever and remember speaking with him maybe 15 years ago when I first got this equipment.

Anyway, he basically said to go ahead and hook-up the dual speakerwire set-up. He did confirm that the "Tape Out" on the pre-amp would not provide any volume. Said to double the wire L&R for both the main speakers and the sub.

There is a warning in the Sub manual saying the amp must be common grounded for this connection, but Leonard said that's fine and not an issue. So I'm going with the dual speakerwire config and let you know how it goes.

Well, everything is hooked-up as described above and no probs, sounds great.

Thanks for the input and help.

Hi, original poster here.
Is it possible to use the same SW for an HT system and a separate audio system?

Still have the ARC gear for audio and was thinking of using the same SW for the HT. Is it possible to connect a single SW RCA cable to my HT and continue using the dual wire method for the ARC amp/pre? The SW supports both single RCA input and dual speaker wire inputs.
Of course not having both systems on at the same time.

Thanks