Hello everyone, I have recently received a speaker system and I'm trying to get it to work. Any help would be much appreciated. I am very new to this and unfortunately, my expertise doesn't go very far.

There are 5 speakers, 1 subwoofer. They are all connected to a Pioneer amplifier, model is SC-LX57. The speakers all work fine, the problem I am experiencing is with the subwoofer. It is Monitor Audio Bronze BXW-10. When I turn it on, the light is green for about 20 seconds, then it goes into red. Based on my troubleshooting, that means it doesn't receive a signal. All the other speakers...