I found out something bad about this cabinet. This weird blue speaker wire is all that's connected to the speaker. I been connected it to my combo amp this way so I can use it, and it works, but is this safe? Could I just connect this wire to a 1/4" female jack and use it with my new amp head, when I get it? I unhooked my speaker from my combo amp and connected the wires to the wires that were connected to the Peavey combo amps speaker.
Considering power goes through these cables, is this at all safe? Would it be safe to connect them to a 1/4" jack and connect that to a speaker output on an amp head? Am I risking a fire?
This advice is for your benefit and for whoever might own that Behringer cab after you. It sounds like you're new to this, and I want to share some advice that will help you now and down the road.
Fix it, and do it right. I do NOT believe in changing the internal wiring on equipment like that, and there is more than one reason. First, the cab simply is not working correctly. Second, are you 100% sure you will remember exactly what you did, and why, two or three years from now and can use the cab without damaging your amp by connecting something badly? Finally, what happens if you get tired of that cab and sell it? Are you going to provide the buyer a full wiring diagram documenting the changes in it and explaining how to use it safely? I doubt it.
First, go online and gat a manual for that cab. There will be one, and it will explain what the connectors on that cab are for. Open it up and see what it's supposed to do.
Then fix it and do it right. Restore the
original wiring connections, which should be quite easy. There isn't a lot of wiring in there, there are just a few wires. If they're color coded, matching them up is trivial; if not, there are other clues like length. But this is the only way that you know that you can use that cab and not damage the amp you're driving it with. And yes, right now that is potentially possible.
The big question you haven't answered is WHY someone got in there and screwed with the wiring. That makes it dangerous to use that cab right now. Something happened to it, and there's a good chance that speaker has a problem or there's something wrong with the electronics. You need to know what is going on, and if there's a problem with the cab, you need to either give it back to the previous owner (for a refund), fix it so it works, or scrap the speaker and get rid of he cab and learn a lesson about buying a speaker cab that has been modified.