I have inherited some "vintage" equipment and need some help with setup.

I didn't unhook them so I don't know how they were originally hooked up.

I have a Luxman TP-114 Preamp which has one set of L and R "fixed" Pre-out jacks and one set of L and R "variable" Pre-out jacks.

I need to connect it to a B&K ST1430 Amp and a powered HSU Subwoofer which were in the original setup.

I assume the Preamp "variable" Pre-out jacks should be connected to the Amp (since the Amp has no volume control).

That leaves the "fixed" Pre-out jacks for the powered HSU subwoofer (which has it's own volume control).

However, the equipment came with only the one RCA cable for the subwoofer.

The subwoofer has an input for mono or L and R, but there is no mono out on the Preamp, just the L and R Pre-out jacks.

Two questions....

1. Am I correct that the variable Pre-Out jacks on the Preamp should go the the Amp?

2. Do I just need to connect either the L or R from the "fixed" Pre-Out jack on the Preamp to the Subwoofer or should there be two RCA cables from the Preamp "fixed" Pre-out jacks to the the L and R input jacks on the Subwoofer?

Thanks in advance for any help you can provide.