REL has a tutorial on their website that is good, not sure it will be helpful to you or not but worth a look.

Thanks for the suggestions. The REL powered subwoofer plate amps are designed differently than the Caldera 10. The tutorial videos were not of much help. Still looking for a diagram if someone can post it. Thanks.

HK

I've used a powered sub in the past but don't currently use one. However, when I did, I used the high-level inputs. (the sub didn't have a line-in). I just connected another set of speaker wires to the same polarity sub high-level input binding posts. I was able to use a set of banana plugs from the amp 5-way binding posts to the speaker and a spade connector (from the amp) to the sub. I've also used bare wire from connector to connector on both the speaker and sub as well. Any combo will work. I see you have a CSP3-25. If it has stereo line out's you could connect that instead of the high-level speaker connections. I feel the high-level connections are better but the line-out may work great as well. Based on the picture you provided, I think you could actually run one set of speaker wires from the amp to the sub and then use the high-level outs on the sub to connect to the speaker if you're able to locate the sub near the speaker. This would minimize the additional speaker cable needed. In a similar way, you could route the initial speaker cable to the speaker first and then jumper it to the sub input. Either way should work fine. Again, I used two sets of speaker wires to connect the speakers and subs in a parallel fashion from the amp 5-way binding posts to their corresponding polarity terminals on the respective terminals of both the speaker and sub. This could be costly if you use high-end cables which is why I mention maybe using a shorter run to 'jumper' so to speak from the speaker to the sub if placement allows and it makes sense. It really shouldn't hurt anything to give it a try.

Anyway, good luck, and I hope you have success.