You are correct, as long as it stays on there, it is making an electrical connection. However with the vibration from the sound waves coming from the subs, it may fall off. I would recommend slodering, or butt connectors if the soldering isn't practical.[/QUOTE] Ive always been a fan of solider and shrink tubing When i was 16 i put my first radio in my car using guess what? Yep...and fortunate for me when the wire nut came off it was only a speaker connection. You would be surprised what will loosen when you hit bumps....etc. I drive my mustang hard.