PreSonus BlueTube DP v2 2-channel microphone and instrument preamplifier gives you more preamp for your money. BlueTube DP v2's "DP" stands for Dual Path. That's because PreSonus packed two sets of preamplifiers into this 1/2U monster pre, each with a pristine XMAX Class A solid-state gain stage and a high-voltage 12AX7-based tube circuit. This audio accessory is the preamp you need for anything from pristinely clean to pleasantly distorted and everything in between.