Used, Final Sale. Sold As Is. Tested to be in good working condition.

The Model 4856 is a two channel 28-band, R-C active graphic equalizer requiring only 3RU rack space. It features a separate sub-woofer output that can be assigned to either channel A or both. A level control with up to 20dB gain; EQ in/out switch; adjustable high-pass filter and fixed low-pass filter; and 6 LED bar graph headroom indicator are provided for each channel. The filter and level controls are 45mm slide faders.
28 One-Third Octave Filters 31.5Hz - 16kHz: On I.S.O. standard frequency centers. Minimum phase type, å±15dB range. Close center frequency tolerances, å±5%. Adjacent filters sum with less than 0.125dB ripple. The low noise specification is not degraded with adjustment of the filters.
Sub-Woofer Output: The separate sub-woofer output is a 12dB/octave Butterworth low-pass filter fixed at 100Hz. It can be setup to derive its signal from channel A or A+B. The A+B setting is implemented as (-(A+B))/2 with respect to the main outputs.
EQ In/Out Switch: Operates silently for convenient comparison.
High and Low-Pass Filters: Band-limit unwanted subsonic and ultrasonic noise. Continuously adjustable, 12dB/octave high-pass 15Hz - 175Hz and fixed low-pass at 31kHz.
High Current, Balanced, Differential Output Stage: Will drive 600 ohms to +19dBu while maintaining 0.02% THD.