Welcome to Big D's Audio!! Are you ever stuck in traffic when a car pulls up next to you and the person's radio causes your internal organs to rattle? Have you experienced the rhythmic, pounding, low frequency noises coming from teenager's sound systems, music so loud it comes from seemingly every direction into your personal space and vibrates your rearview mirror 12 feet away? This occurrence is my fault if you live in the Grand Rapids area. Hi. I'm Stephen Disselkoen, owner of Big D's Audio L.L.C., a leading company in the mobile audio industry, and I am an audiophile.