Warm Audio WA-412 4-Channel Microphone Preamp with DIAchieve Classic Console Tone with the Warm Audio WA 412 Mic Preamp The Warm Audio WA 412 is a 4 channel microphone pre amp that delivers the iconic sound of American console preamps in a compact 1RU design. Known for its punchy low end and smooth top end, this preamp is ideal for achieving a "Rock n' Roll" sound. With features like output trim, a tone switch for selectable input impedance, and fully discrete socketed opamps, the WA 412 offers