I'm looking to switch from my current Rugged intercom to a PCI Elite unit with bluetooth. My question is, how much difference does the DSP make? What difference exactly would I notice? It's about a $200 option. I assume my current Rugged (696 Plus) doesn't have any such feature. Intended use is in a Can Am with 2-4 people all wearing helmets with wiring kits. Thanks for any feedback.