The Rolls RA102 is a 10-channel professional headphone amplifier. Designed with volume controls and 1/8″ headphone outputs on the front of the unit, along with 1/4″ headphone outputs on the back of the RA102 for each channel, the RA102 has the connections for any professional application. Its join function allows many RA102’s to be linked together without any signal loss or impedance issues. It also features XLR balanced inputs and RCA stereo inputs. 1U Chassis to maximize your rack space Strain relief for AC adapter Both balanced XLR and unbalanced RCA inputs Suitable for very wide range of headphones Join in and join out jacks for expanding to all the channels you want Input Impedance: 10K Ohms unbalanced Max Input Level: +18 dBV Input Connectors: RCA, balanced XLR Outputs: Ten 1/4″ TRS Stereo jacks; ten 1/8″ (3.5 mm) TRS Stereo jacks Max Gain: 20 dB/Channel Max Output Power: up to 250 mW/side, 500 mW/Channel Frequency Response: 20 Hz – 30 kHz S/N Ratio: 90 dB THD: <.008% IMD: <.008% Phase Shift (In to Out): 0 deg. Slew Rate: 2 V per microsecond Crosstalk: - 65 dB Power: 12 VAC (Rolls Model PS12) Weight: 7 lbs (3KG) Size: 19" x 1.75" x 3.125" (48cm x 4.5cm x 17cm) Headphone impedance: 8 Ohms to 1000 Ohms