The HPA 8 is a 19" 8-channel rack-mount headphone amplifier. It features 8 stereo headphone jack inputs and Mono/Stereo selectors. Each channel is individually controllable and can receive a main mix or a specific auxiliary source. It has dual inputs (XLR, RCA, TRS, mini-jack) and offers mono/stereo mode, channel separation, and total channel independence. It will allow you to amplify a weak audio signal to power up to eight headphones.