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Dual Channel
1/3 Octave - 28 Band
High and Low-Pass Band Limiting
Sub-Woofer Output
Model 4856
Dual Channel One-Third Octave Graphic Equalizer
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Features + Economy + Minimum Package:
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 bargraph 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, ±15dB range. Close center frequency tolerances, ±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.
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Specifications:
Model 4856
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Number of Channels:
Two.
Frequency Range:
20Hz (-1dB) through 20kHz (-0.5dB), typical with all 1/3 octave filters set at center.
Dynamic Range:
109dB
Recommended Operating Level:
0dBu (0.775 volts rms).
Maximum Operating Level:
+19dBu into 600 ohms.
Noise:
Better than -89dBu (re. 0.775 volts) at unity gain, 20kHz bandwidth. Worst Case. (-93dBu A-weighted)
Distortion:
Less than 0.02% THD into 600 ohms, 20kHz bandwidth.
Filter Type:
R-C active, MFB.
Filter Control Centers:
Each Channel. 28 one-third octave filters on I.S.O. standard frequency centers from 31.5Hz through 16kHz.
Filter Center Frequency Tolerance:
±5%.
Filter Controls:
45mm linear potentiometers.
Filter Control Range:
±15dB at center frequency.
EQ In/Out Switch:
Each Channel. Front panel mounted. By-passes 1/3 octave filters only. Silent operation.
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High-Pass Filter:
Each Channel. -3dB point adjustable from 15Hz -175Hz, 12dB/octave response.
Low-Pass Filter:
Each Channel. -3dB point fixed at 31kHz, 12dB/octave response.
Gain:
Each Channel. 0dB to +20dB. Continuously variable.
Headroom Indicator:
Each Channel. Multicolor 6 LED bargraph display, 3dB resolution.
Connectors:
Each Channel. Latching XLR-3 with chassis grounded shells and Redundant 1/4" TRS. Sub-Woofer XLR-3.
Input/Output Circuits:
Active servo-balanced differential. Can operate unbalanced with no change in dynamic range.
Common Mode Rejection:
Greater than 85dB at or below 1kHz and greater than 65dB at 10kHz.
Input Impedance:
30 kilohms, balanced. 10 kilohms, unbalanced.
Output Impedance:
100 ohms, balanced. 50 ohms, unbalanced.
Power Requirements:
90 - 130 / 180 - 260 VAC, 50/50Hz, user selectable on rear panel. Fuse: 750mA, slow-blow, 1.25".
Mute Relay:
Mutes audio on power-up and power-down.
Dimensions and Weight:
5.2" by 19" (rack mount 3RU) by 12"
13.2cm by 48.3cm by 30.5cm
9.5 lbs. - 4.31kg
Finish:
Black painted brushed aluminum. White nomenclature.
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Please Note: White Instruments reserves the right to improve our products and to change features and specifications without notice.
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