If I need to glue two boards together for a 3ft subwoofer, do I put glue where the wood meets or just along the sides where they meet?

I'm new to wood working and I just finished checking my dry run. Everything is good so now it's time to glue. I would think you put glue where the boards meet (on the bottom of one board side that's connecting). However I want to make sure I'm doing this right since it's baltic birch bb/bb and it was expensive.