Howard, there are a few ways to run two subs off one amp.
For example, if you have a receiver, you can run a single interconnect from the sub-out on the receiver to a line-in on sub number one. Then you run a second single interconnect from the line-out on sub number one to the line-in on sub number two.
Another example. You can run a pair of interconnects from the pre-out on a pre-amp to the line-in on sub number one. Then run a second pair of interconnects from the line-out on sub number one to the line-in on sub number two.
The wiring also depends upon whether you run the left and right front speakers full range, or whether you are filtering ouput in the sub. But I won't get too complicated with all the combinations because I don't know what type of amp set up you're using, receiver, or preamp-power amp or even what the connections on the REL sub are.
I can't offer any opinion on the side issues you raised other than to say it was always my understanding that the subs shuld be separated, with each one close to each of the speakers.
For example, if you have a receiver, you can run a single interconnect from the sub-out on the receiver to a line-in on sub number one. Then you run a second single interconnect from the line-out on sub number one to the line-in on sub number two.
Another example. You can run a pair of interconnects from the pre-out on a pre-amp to the line-in on sub number one. Then run a second pair of interconnects from the line-out on sub number one to the line-in on sub number two.
The wiring also depends upon whether you run the left and right front speakers full range, or whether you are filtering ouput in the sub. But I won't get too complicated with all the combinations because I don't know what type of amp set up you're using, receiver, or preamp-power amp or even what the connections on the REL sub are.
I can't offer any opinion on the side issues you raised other than to say it was always my understanding that the subs shuld be separated, with each one close to each of the speakers.