Loaded with tonnes of advanced features. The Samson S Phone 4-Channel Headphone Amplifier is a powerful and flexible solution for monitor and cue mixing. Youll be free to feed the S Phones four channels simultaneously by using the rear-panel stereo master input and additional front-panel stereo injection. You can even create individual monitor mixes by taking advantage of each channels stereo auxiliary input. Get your headphone mixes spot on with the S Phone-4.