This is a great sounding and fully loaded 4-ch preamp designed by Cliff Maag which boasts the legendary Airband EQ for that breathy vocal or top-end sheen on your mix bus, in the form of a 2. 1 out of 5 stars 83 MIC PREAMP - Phantom power (+48v) and plug-in power (1. There was a Groove Tubes ViPre that just sold for $1300 on eBay earlier today. This mic has a build that’s on the smaller side, but still made of the same top quality Neumann materials. presonus bluetube dp v2 microphone preamps. Thus a mic preamp with a 1500 Ohm input impedance will present a bridging load to a microphone with 150 Ohm output source Z.