HA400 Ultra-Compact 4 Channels Stereo Headphone Amplifier With Power Adapter Description: Compact 4-channel stereo headphone amplifierCan be used for up to four headphones at the same time thomann i.e. for simultaneous listening of main mix with separate volume control. Comes with four powerful stereo amplifiers that deliver outstanding performance at any volume. Clear sound with ultra low-noise 4580 operational amplifiers that are used in 19" studio equipment. If you're tracking more than one musician at a time, or if every member of the group wants to hear playback, you need a monitor distribution system. The compact, flexible HA400 can drive up to four pairs of headphones and up to four separate volumes. Combined use: You can use this ultra-compact stereo headphone amplifier with any of the 4 headphones at the same time. Four listeners in the studio can listen to the main mix while recording, and each listener can adjust their own volume using the dedicated output level control. The HA400 contains four high-powered stereo amplifiers that maintain maximum sound quality at maximum volume. Features: 4-channel stereo headphone amplifier for all models of headphones Optimum sound quality even at high volume levels Output level on each channel Ultra-low noise 4580 operational amplifier ensures superior sound quality Separate volume control for each channel 1 Input with 6.3 thomann mm stereo jack Input impedance 100 Ohm 4 outputs with 6.3 mm stereo jakcs Output impedance 80 Ohm Dimensions (W x H x D): 103 x 46.5 x 57.2 mm Specifications: Input Channels:1 Input Output Channels:4 Output Analog Inputs:1 x Stereo Analog Outputs:4 x TRS Input voltage: 110-240V Form Factor:Desktop Dimension (W x D x H):104 mm x 57 mm x 50 mm Package Includes: 1*Headphone Amplifier 1*Power Plug