The time has come. You need more headphone ports. And you want them to sound good too right? The Mackie HM-4 is the answer. With a single stereo input and four stereo outputs this handy little box lets you send your signal to four places with no signal degradation. Expand your capabilities. Whether youre looking to split a headphone mix in the studio or on the stage or watch a movie and listen to music with friends and family. The HM-4s ultra-compact design lets you do it with ease. 1/4 stereo inputs and outputs make getting connected quick and simple. Handle your levels with precision. Each output boasts a dedicated control knob for adjusting the volume. You can set different levels for each one making it perfect for personal mixes. And with Mackies Built-Like-A-Tank construction itll be by your side for years to come. Split that signal Going four ways at once is difficult. It can really ruin a day out. But when it comes to audio Its pretty nifty. And thats exactly what the Mackie HM-4 lets you do. Plug your sound source into the 1/4 stereo input and unleash it across the amps four independent headphone outputs. In the studio? On stage? At home or work? It doesnt matter where you are. Those four outputs let you send out four headphone monitor mixes to musicians and engineers or you can watch a movie and listen to music with your family and friends. Huddled together. Very closely. Not muttering a single word. Whoever you choose to join your headphone army they (or you depending on how you feel when it comes to letting other people touch your possessions) are in charge of their own levels. Four control knobs dedicated to each individual output provide the ability to make adjustments with precision. Go from Excuse me good fellow can you turn it up a bit please? to Sorry chaps my ears are bleeding would you be so kind as to call me an ambulance? and everything in between. And do it with ease. In it for the long haul If you know Mackie you probably know that they are incredibly proud of their Built-Like-A-Tank approach to construction. Their products are living proof that eternal life is a possibility. Because when you buy a Mackie product youre not just buying a new piece of equipment. Youre investing in your future. Features Intuitive and convenient headphone amplifier Split a single stereo source to up to four pairs of headphones Precise level adjustment with an individual control for each output Robust and reliable with Mackies signature Built-Like-A-Tank construction Powered via the included 12V AC adapter Specifications Maximum Level: +22dB (1/4 input) Input Type: Female 1/4 unbalanced stereo Input Impedance: 10 k Ohms each channel unbalanced Output Type: 4 x Female 1/4 unbalanced stereo Output Impedance: 47 Ohms each channel unbalanced Level Control: 4 x Rotating knobs Power Requirements: +12V DC Current Draw: Less than 220mA (maximum) Display LEDs: Top power ON/OFF Dimensions: 51mm x 109mm x 58mm / 2 x 4.3 x 2.3 (H x W x D) Weight: 0.2kg / 0.5lbs