ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer
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XL231 Architect's & Engineer's Specification
The graphic equalizer shall be stereo (2 channels). Each channel shall consist of 31 bands centered on
standard ISO frequencies at intervals of 1/3 octave and covering a frequency range of 20Hz to 20KHz.
Individual frequency bands shall be adjusted by linear slide faders with 45mm travel, tactile center detent,
and metal actuator shafts with dust dams. The range of equalization shall be switch selectable to one of
four boost/cut modes; ±12dB, ±6dB, +12/-18dB, or +6/-9dB. The –18dB and –9dB (enhanced) cut modes
shall have a more narrow bandwidth for reduced audible artifacts while performing deep frequency cuts.
The equalizer shall have a gain of unity with all slide faders centered. The equalizer shall provide a rotary
gain control with a range from Off to +6dB. Frequency response shall be +0/-0.25dB 20-20KHz. Hum and
noise shall be less than or equal to –99dBu and SMPTE intermodulation distortion or THD shall be less
than 0.005% @ +4dBu. Total dynamic range shall be greater than or equal to 123dB, referenced to
+24dBu, measured with a 22KHz bandwidth. Input impedance shall be 9.4K Ohms balanced and
maximum input level shall be +24dBu. Output impedance shall be 100 Ohms and maximum output level
into 600 Ohms shall be +26dBu balanced. Inputs and outputs shall be active (transformerless) balanced
type on XLR, ¼” phone, and detachable Euroblock connectors. Individual bandpass filters shall be 3%
precision tolerance constant Q design, with interleaved summing, for minimum filter interaction and
accurate control setting. The filters shall be electrically removed from the circuit in the center (flat) slider
position. The equalizer shall include a 12dB per octave high pass filter tunable from 10Hz to 250Hz, as
well as variable Low Trim and High Trim rotary controls providing ±4dB of gradual boost or cut below and
above 1 KHz respectively. A three color 11 segment LED bar-graph with clip indicator, and peak-hold
readout shall be included on each channel for visual level monitoring. There shall be a unit bypass relay
which shall be activated by power failure or front panel bypass switch on each channel. The equalizer
shall weigh 12 lbs., and mount in a standard 19” EIA rack using 3 spaces (5.25” high x 19” wide x 8”
deep). The power requirement shall be 95-125 VAC, or 190-250 VAC, 50/60 Hz, 31 Watts. Note: 0dBu =
0.775 Vrms. The unit shall be the ART XL231.
Summary of Contents for XL 231
Page 1: ...OPERATION MANUAL ...
