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General
Two channel 15 2/3 octave band graphic equalizer with frequency control of 25Hz to 16KHz. Is a
incorporates constant Q circuitry with a 3% center frequency accuracy. Special features include
selectable range 6dB or 12dB, active balanced and unbalanced input/output connectors, RFI
filters, variable level control, passive bypass switch, overload threshold LED, ground lift switch
and selectable line voltage switch.
Installation
Equalizers are designed for mounting in a standard 19" equipment rack or one of the many rack
type portable cases available on the market. The vertical space is 1.75 inches (44,5mm). The
XEQ-152B has 8.5inches (216mm) in depth.
Power connectors
The XEQ-152B integrates an IEC Connector to operate at 120/50Hz or 240 volt/50Hz. Before
use, check the slide switch to match your line voltage supply. CAUTION: To new installations and
portable sound systems, or any situation in which the mains power is suspect, it is wise to confirm
appropriate voltage and line polarity BEFORE connecting the instrument to power source.
DO NOT REMOVE THE CENTER GROUNDING PIN; In new installations and portable sound
systems, or any situation in which the mains power is in question, it is wise to confirm the voltage
and select the appropriate line voltage switch BEFORE connecting the instrument to power
sources.
Input Output Connections
The XEQ-152B graphic equalizer has three paralleled input and output connectors. XLR and 1/4
TRS are actively balanced with Pin 2 or the tip being Hi, Pin 3 or the ring being Lo, and Pin 1 or
sleeve being ground. Unbalanced operation requires using the RCA phono connector or use Pin
2 of the XLR or tip 1/4" TRS as Hi(+) and Pin 1 of the XLR or sleeve of the 1/4" TRS as ground.
Balanced output requires using Pin 2 of the XLR or the tip of the 1/4" TRS as output Hi ( +) and
using pin 3 of the XLR or the ring of the 1/4" TRS as Lo(-).It does not require pin 1 or signal
ground. The signal exists differentially between the two balanced leads. Ground is used only for
shielding to prevent potential hum.
Signal levels
Signal levels from -10 dBu to +4 dBu are considered normal and at least 20dB of headroom exists
above these levels. Do not directly connect microphones into the equalizer. Microphones require
a pre-amp.
Chassis Grounding
The equalizer is equipped with a rear panel Ground lift switch. After setting up your system and
the system exhibits excessive hum or buzzing, the problem is that there is a ground incompatibility
between your equalizer and other equipment in the same system. There are several combinations
that can be attempted. Note: ALWAYS TURN YOUR AMPLIFIERS DOWN BEFORE
CHANGING YOUR GROUNDS AROUND.
Try different combinations of lifting grounds on units that are supplied with ground lift switches or
make sure all chassis are connected to earth ground, either through the A.C. power cord ground
or by the front panel rack mount screws.
