Very simple. You and up to three other friends want to listen to the same mix under headphones. Just take the HC 4S, plug in, turn on, adjust your individual volumes, and get down.

The HC 4S provides master stereo Inputs which can be used to drive the four stereo headphone amplifiers. A Mono switch is provided on the front panel to drive both channels of all four amplifiers from a common mono source. Both 1/4" and 3.5mm jacks are on the front panel for adapter-free enjoyment.

The HC 4S is capable of delivering up to 200 milliwatts into headphones with rated impedances between 32-600 ohms. The precise amount of power depends on the exact impedance of the headphone in use and the number of headphones connected to the unit. Under most conditions, the HC 4S produces sound pressure levels in excess of 120 dB.

The HC 4S improves upon the HC 4 model with the addition of 3.5mm headphone jacks, which can be used in combination with the 1/4" jacks.