SPL Phonitor One, Headphone Amplifier, For studio and hi-fi applications, Infinitely adjustable crossfeed function - crosstalk between the two stereo channels for more realistic surround sound, Pre-amplification by 2 Burr-Brown OPA 2134 SoundPlus operational amplifiers for extremely low noise and minimal distortion, THD + N (0 dBu, 10 Hz - 22 kHz, 600 O): 0.002%, Max. Input level: +22.5 dBu, Noise (A-weighted, 600 O): -97 dBu, Max. Output power (600 O): 2x 190 mW, Max. Output power (250 O): 2x 330 mW, Max. Output power (47 O): 2x 400 mW, Frequency response headphone output (- 3 dB): 10 - 200,000 Hz, Two switchable stereo inputs: 6.3 mm balanced TRS jack and unbalanced RCA, Headphone output: 6.3 mm stereo jack socket, Dimensions (W x H x D): 210 x 49.6 x 220 mm, Weight: 1.45 kg