UREI 535 Dual Graphic Equalizer

FEATURES

• Operates at any nominal level with low level mixers, high or low impedances, and balanced or single-ended circuits
• Provides 12dB of boost or cut at each of its 10 frequencies.
• Graphic representation of the response curve
• Filters are active, minimum phase, 2-pole synthesized LC networks
• Front panel control adjusts gain
• Bypass switches permit switching the equalization out for A-B tests

SPECIFICATIONS

ELECTRICAL (EACH CHANNEL):

INPUT:  Balanced bridging, differential amplifier.

INPUT IMPEDANCE:  40k ohms, used as balanced input.
20k ohms, used as unbalanced
(single-ended) input.

MAXIMUM INPUT LEVEL: +20 dB (7.75 volts)

EQUIVALENT INPUT NOISE: Less than -90 dBm. 15.7 kHz noise bandwidth with all controls set flat, output terminated with 600 ohm load (Model 535, -88 dBm)

GAIN: Variable, -10 dB to +20 dB, with front panel control.

FREQUENCY RESPONSE: ±1 dB, 20-20,000 Hz (with no EQ).

OUTPUT: Floating, transformer isolated

OUTPUT LOAD: 150 ohms or greater

POWER OUTPUT: +24 dBm into 600 ohm load (12.28 volts), +20 dB into 150 ohm load (7.75 volts)

DISTORTION: Less than 0.25% THD, 30 Hz to 15 kHz at maximum rated output

FILTER TYPE: 2-pole synthesized L-C

FILTER BANDWIDTH: 1-octave at -3 dB points with 8 dB boost or cut

CENTER FREQUENCIES: Standard ISO (Hz) 31.5, 63, 125, 250, 500; 1k, 2k, 4k, 8k, 16k

FREQUENCY ACCURACY: ±3% of center frequency

RANGE OF BOOST AND CUT: 12 dB, single filter section

CALIBRATION OF BOOST AND CUT: Within 1 dB of indicated setting, 0 to ±6 dB, within 1.5 dB of indicated setting, ±6 to ±12 dB, (single filter section)

CHANNEL SEPARATION: 60 dB worst case at high frequencies, typically better than 80 dB

MISCELLANEOUS:

POWER REQUIREMENTS: 100-125 VAC or 200-250 VAC, 50/60 Hz, switch selectable, less than 10 W

ENVIRONMENT: Operating 0°C to +50°C (+32°F to +122°F); storage -20°C to +60°C (-4°F to +140°F)

CONNECTIONS: Input and output, through rear chassis barrier strip, or XLR/QG connectors through Model 301 accessory adapter; Power through 3-wire power cable; Model 533 utilizes IEC style connector and power cord

CONTROLS:

EQUALIZATION: Vertical slide controls, continuously variable 0 to ±12 dB

GAIN: Screwdriver adjustable from -10 dB to +20 dB

EQ IN/OUT: Front panel toggle switch

POWER: Front panel toggle switch

INDICATORS: LED, Power ON; LED, Overload Condition, levels monitored at 3 circuit points

MAIN VOLTAGE: Rear panel slide switch, 115/230 volts