Full frequency response, four channel headphone monitoring device designed for the recording studio, or other professional applications. Each output boasts a whopping 20 dB of clean channel gain. * Stereo 1/8-in and Dual RCA Inputs * Rotary Volume controls * AC adapter included * 15-35k Hz frequency response * Lots of output level.... it’s loud! * 9V battery Operated * Input Impedance: 47k Ohms * Max Input Level: +13 dBV adapter, +8 dBV Battery * Input Connectors: TRS Stereo 1/8-in, Dual RCA * Outputs: 4 - TRS Stereo 1/8-in (3.5mm) * Output Impedance: 10 Ohms each output * Max Gain: 20 dB/Channel * S/N Ratio: >90 dB * THD: <.008% * IMD (SMPTE): <.008% * Nominal Current Draw: 30 Mills Min./ 400 Mills Max. * Expected Battery Life: 8 Hours Continous use * Frequency Response: 15-35K Hz. * Recommended Headphone Impedance: 16 to 500 Ohms. * Power: 15 VDC (Rolls Model PS27s) * Weight: .85 lb * Size: 4.5-in x 1.125-in x 4.5-in