MX presents Mini to the max Headphone Amplifier. You can use this super stereo headphone amplifier with practically all headphones- Four of them at the same time. For example, you can let up to 4 different people in your studio listen to the main mix while the recording is being made, and each listener can determine his own volume level using the dedicated output level controls. The MX Headphone Amplifier contains 4 high power stereo amplifiers that maintain the highest sonic quality even at maximum volume levels. Ultra low-noise operational amplifiers are included for outstanding audio performance 'these are the same o/p amps found in "full-size" audio equipment - plus, a DC 12 Voltage adapter is included. If you are one of those musicians who like to deck out their equipment with lots of bells and whistles, then MX Headphone Amplifier definitely makes a great addition to the functionality of your studio.