I have a vintage Yamaha CR1020 receiver I would like to connect new Klipsch Speakers and subwoofer to.
My new Klipsch R-112SW subwoofer has no High Level inputs and my receiver has no sub-out.
What is the optimal method to connect these two components?
I would have thought it would have been sensible to sort this out before you bought the speakers and sub.
You can do this, but unless you buy an electronic crossover you will have limited bass management, as your sub has no high pass out.
You need an RCA to RCA stereo cable.
Connect one end to both the pre outs on the Yamaha, and the other end to the two line ins on the sub.
Do not throw the switch on the Yamaha to break the connection between the pre outs and pre ins.
Now set the crossover on the sub to the F3 point of your speakers X 2 for starters. You did not say what model you have, so you will have to look at the spec sheet. Now advance the volume on the sub until you have the balance you desire. Now adjust the phase control until it sounds best to you and adjust for maximum output at a given volume setting.
Now it will not be possible for you to off load the bass from your main speakers unless you buy an electronic crossover.
In this case you would connect the preouts to the line in of the crossover. With a second RCA cable you would connect the low pass out to the sub.
This time you would throw the switch to break the link between the pre outs and the pre ins.
Now you would take a third RCA cable and connect the high pass out of the crossover to the pre ins of the Yamaha.