IMG Stageline HPR-6, Stereo Headphone Amplifier, Can also be used as a small power amplifier for 4-8 Ohm speaker systems, Stereo RCA input, 6.3 mm stereo jack output, Volume and balance controls, Metal housing, Frequency range: 19 - 40,000 Hz, Input signal: 110 mV - 4 V, Output signals: 2x 525 mW / 2x 1500 mW / 4 Ohm, 2x 330 mW / 2x 750 mW / 8 Ohm, 2x 114 mW / 2x 200 mW / 32 Ohm, Signal to noise ratio: 69 dB, Distortion factor 1%, Power supply via enclosed plug-in power supply, Dimensions: 120 x 68 x 36 mm, Weight: 288 g