Mackie's ultra-compact HM4 is a 4-way headphone amplifier with a 1/4" stereo input and four 1/4" headphone outputs with individual volume controls. This makes it ideal for studios or at home when up to four people want to listen together;

Mackie HM 4 Overview

• Distributes a single stereo signal source to up to 4 pairs of headphones
• Individual level control for each output
• Supplied 12 V power supply unit for power supply
• robust, roadworthy construction
• Dimensions: 51 x 109 x 58 mm
• Weight: 0,2