Subwoofer connection to older tube amp


I need to connect my Dominator 8 Sub to an Audio Research D-90 Amp and SP-12 Pre. The amp outputs only allow left and right bare wire speaker connections for different ohm ratings and I'll use the 8 ohm for main speakers.

Like most subs I'm afforded 2 pair of Left & Right Speaker Level inputs and 1 pair L&R Line(RCA plug) inputs and 1 pair L&R Line outputs.

Where would I hook the L/R from the amp to the sub? I want to use the set-up mostly for music but also for movies/DVD's.
jamesk58
If you have bare wire (terminated) for the sub you'd connect them to the same terminals on the amp.
So just connect the sub wires to the same amp terminals as the main speaker wires?
Unless you have an extra set of line-outs from your pre-amp. Then you can run RCA or XLR cables from the extra main/line outs from the pre to the line in on the sub.