Radial KL-8 Rackmount Keyboard Mixer. Designed to provide complete control over a professional keyboard setup, both on-stage and in the recording studio. Four stereo analog inputs for keyboards Redundant USB connections for laptop soft-synths Stereo Aux Send/Receive with optional footswitch control Headphone outputs and cue switches for silent monitoring You can link multiple KL-8s for larger setups Specifications Frequency response: 20Hz to 20kHz +/- 0.5 dB Dynamic range: Main & Monitor Outputs: 90 dB referred to +28 dBu, 102 dB A-Weighted Total harmonic distortion: Main & Monitor Outputs: 0.01% (100Hz to 20kHz @ 0 dBu) (-80 dB) Input Impedance: Analog Inputs 1-4: 14.3 to 20k Ω (input level max / input level min); Auxillary Inputs: 33k Ω Output Impedance: Auxillary Outputs: 2.2k Ω; Main & Monitor Inputs: 1.1k Ωl Headphone Outputs: 51 Ω Maximum Input: Analog Inputs 1-4: +18 dBu (+16dBV); Auxillary Inputs: +11dBu Maximum Output: Auxillary Outputs: +18dBu; Main & Monitor Outputs: +28dBu; Headphone Outputs: 0.4 W into 15 Ω (8.3 VRMS max) Features Extras: USB Digital Connection - Bit Depth / Sample Rate: 24bit /192kHz General Size (L x W x D): 19" x 7" x 1.62" (48.26mm x 17.8mm x 4.13mm) Weight: 6.25lb (2.83kg) Shipping size (L x W x D): 22” x 10.375” x 4.5” (55.9mm x 26.4mm x 11.4mm) Shipping weight: 8.9lb (4.04kg) Power: 100V to 240V, locking 4-pin XLR Conditions: For use in dry locations only between 5°C and 40°C