I’ve recently finished building my crack, and I am interested in using it as a preamp for my speakers. I was thinking I could just glue a bit of sheet metal with rca jacks in it to the underside of the chassis, and have an rca cable just run under the gap under the wood. I’m just not sure if it’s that simple, and wanted to ask here. What terminals would I need to use? Are there grounding problems or anything like that when using another piece of metal? And do I need any extra resistors or anything like that?