Used Mackie HM-400 Headphone Amp

Used Mackie HM-400 Headphone Amp in Excellent condition—an easy, reliable way to drive multiple headphones with clean, consistent volume. This compact 4-channel amplifier features four independent headphone outputs with separate level controls, letting each listener set their own mix level. Built for studio tracking, rehearsal, podcasting, and small live rigs, it delivers strong output and low-noise performance in a rugged Mackie design—perfect for expanding monitoring without complicating your setup.