Specifications:
All specifications apply when driving
600 ohms or higher impedances. Noise
measured on an average-reading meter
through a20-20,000Hz bandpass filter
with !8dB/octave Butterworth skirts.
ELECTRICAL
Input:
Impedance, Load (each leg): I00K in
parallel with lOOOpF, electronically
balanced
Impedance, Driving: Ideally 600 ohms
or less, balanced or unbalanced
Nominal Input Level: Between -10
and +4dBm
Absolute Overload Point: +26dBm
Output:
Impedance, Source: 47 ohms in parallel
with lOOOpF, unbalanced (Optional
transformer balanced 600 ohm outputs)
Impedance, Load: Should be 600 ohms
or greater—will not ring into any
capacitive load
Nominal Output Level: +4dBm
Max. Output Level Before Clipping:
greater than +19dBm, 20-20.000H
z
Frequency Response:
±0.25dB; 20-20,000Hz: EQ controls set
at zero detents
Available Gain:
+!2dB; adjustable to -infinity by means
of front-panel GAIN control
Slew Rate:
Varies between 6and 13V/us depend-
ing upon setting of GAIN controls; slew-
ing is symmetrical. Internal bandlimiting
assures that slew rate limiting will not
occur even with the most severe
equalization and program material.
Square Wave Response:
Square wave exhibits no spurious ring-
ing at any output level. The only ringing
observable is that theoretically
associated with any given equalization
curve.
Total Harmonic Distortion:
Less than 0.08%, 20-20,000Hz
(+!8dBm)
SMPTE Intermodulatlon Distortion:
Less than 0.05% (+!8dBm: 60/700Hz,
4:1)
Noise at Output:
Less than -78d8m (EQ in, filters out,
controls centered)
Overload/Nolse Ratio:
Better than 113dB for any single band-
pass filter, for any settings of TUNING or
BANDWIDTH controls.
Equalization Ranges:
±!6dB peaking EQ, Reciprocal
Tuning Ranges:
20-60Hz; 40-150Hz; 1!0-310Hz;
230-750Hz; 480-l900Hz; l.l-4.5Hz;
2.8-9.0kHz; 5.9-21 kHz. Dials calibrated
at ISO preferred frequencies.
Crosstalk:
Typically better than -55dB@ 20kHz;
improves at 6dB/octave below that fre-
quency.
"Q" Range:
Greater than 0.5 to 10 for any setting of
the TUNING control.
Low Pass Filter Section:
Tunable in 2ranges: 200-2000Hz or
2.0-20kHz, 12dB/octave, (2nd-order But-
terworth)
High Pass Filter Section:
Tunable in 2ranges: 20-200Hz or
200-2000HZ, 12dB/octave, (2nd-order
Butterworth)
Overload Indicator:
Lamp lights for 200ms if the instan-
taneous peak output of any amplifier
rises to within IdB of its clipping point.
Circuit Design:
Active RC realized with FET-input
opamps. Line driver employs discrete
transistor current booster.
Operating Temperature:
0-50° C
Power Requirements:
115/230VAC ±10%; 50/60Hz; 12 watts
PHYSICAL
Operating Controls (each channel):
EQUALIZATION, TUNING, and BAND-
WIDTH for each of eight bands. TUN-
ING, RANGE (xI; X10), and FILTER
IN/OUT for each filter. EQUALIZATION
IN/OUT, POWER ON/OFF, and GAIN for
entire equalizer.
Panel:
19" XS'A" (48.3 X13.3cm): 3units
Chassis Depth Behind Panel:
5'A" (13.3cm)
Weight:
Net: Ilibs. (5 kg); Shipping: 13 'A lbs.
(6.1 kg)
AC Cord:
3-wire U-ground to USA Standard
Connectors:
140 type barrier strip (5# screw); holes
punched for XLR-type connectors
(Switchcraft D3F and D3M or equal)
Circuit Ground:
Available on barrier strip; normally
jumpered to chassis.
Options:
1) Plexiglass security cover for EQ and
filter sections
2) Balanced transformers in two or four
outputs
3) XLR-type connectors on input and
two or four outputs
4) Phone jacks on input and two or four
outputs
