I hook up the JBL mic to my phone and run SigScopePro to match the levels (roughly) at the pink noise screen, then I set the volume to conversation level. I found that best results are achieved if the volume is about the same as someone sitting in the passenger seat mumbling/talking to themselves. One thing that upsets me is the BMW HU fan. It's loud and I feel like it's messing with my sweeps
- P