About this item 4 Channel Stereo Headphone Amplifier Fosi Audio PH04 is a 4 high-power stereo amplifiers with output level control for each channel, compatible with 3.5MM headphones and 6.35MM headphones(You need a 3.5MM to 6.35MM adapter). If you're tracking more than one musician at once, or if everyone in a group wants to listen to a playback, you need a monitor distribution system. The compact, flexible PH04 can power up to four pairs of headphones and up to four independent volumes. Upgraded Version PH04 is designed with a power switch and 3.5MM headphone output compare with other 4 CH headphone amp. When a recording session calls for everyone's heads and ears to be in the game, the PH04 is the perfect solution and a real money-saver! Great Sound, Great Value The PH04 contains 4 independent stereo high-power amplifier sections that maintain the highest sonic quality even at maximum volume levels. These ultra-low-noise operational amplifiers are included for outstanding audio performance: the same op amps found in "full-size" audio equipment. Ultra-Compact Design A Simple Solution: Ultra-compact headphone amplifier system for studio and stage applications. Grab this super-compact amp during your sessions to power practically any headphones: four of them at the same time. To be exact, let up to 4 different people in your studio listen to the main mix while recording, and each listener can determine their own preferred volume level using the dedicated output level controls. What You Get PH04 Amp x1, 12V DC power adapter x1, user manual x1, our worry-free 24-month warranty, and friendly customer service. PH04 4 Channel Headphone Amplifier Stereo Audio Amp with 12V 1A Power Adapter Ultra-Compact Portable Headphone Splitter for Studio and Stage Electronics › Headphones, Earbuds & Accessories › Amplifiers Electronics › Headphones, Earbuds & Accessories › Amplifiers Electronics › Headphones, Earbuds & Accessories › Amplifiers Electronics › Headphones, Earbuds & Accessories › Amplifiers