Inter-m EQ-2131, EQ-2231, EQ-2215 Operating Manual
EQ-2131/2231/2215
B370031OC03OC03
0210
Graphic Equalizer
Contents
Contents
Welcome
Warning.........................................................................................................................................1
Unpacking......................................................................................................................................2
Short Form Instructions.....................................................................................................................2
Installation
Environment....................................................................................................................................3
Important Safety Instructions.............................................................................................................3
Description.......................................................................................................................................4
Features............................................................................................................................................4
Accessories.....................................................................................................................................4
Front Panel ......................................................................................................................................5
Rear Panel .......................................................................................................................................7
Applications
Rack System Installation (EQ-2131) MONO......................................................................................9
Rack System Installation (EQ-2231/2215) DUAL CHANNEL or STEREO ...........................................10
Music Stage Installation (EQ-2131) MONO ....................................................................................11
Music Stage Installation (EQ-2231/2215) STEREO 3-WAY..............................................................12
Connections...................................................................................................................................13
Operation
Treating Feedback.........................................................................................................................15
System Tuning...............................................................................................................................16
Troubleshooting
Assistance.....................................................................................................................................17
Block Diagrams
EQ-2131......................................................................................................................................18
EQ-2231......................................................................................................................................19
EQ-2215......................................................................................................................................20
Specifications ................................................................................................................................21
Service
Procedures....................................................................................................................................22
Schematic.....................................................................................................................................22
Parts List .......................................................................................................................................22
Variations and Options ...............................................................................................................22
Warranty .......................................................................................................................................22
GRAPHIC EQUALIZER
Welcome
Welcome
A personal welcome to you from the management and employees of Inter-M
All of the co-workers here at Inter-M are dedicated to providing excellent products with inherently good value,
and we are delighted you have purchased one of our products.
We sincerely trust this product will provide years of satisfactory service, but if anything is not to your complete
satisfaction, we will endeavor to make things right.
Welcome to Inter-M, and thank you for becoming part of our worldwide extended family!
This symbol is intended to alert the user to the
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
Caution: To prevent electric shock do not use this (polarized) plug with
Attentions: Pour prévenir les chocs électriques ne pas utiliser cette
WARNING
To prevent fire or shock hazard, do not
expose the unit to rain or moisture.
*Do not install this equipment in a confined space such as a book case or similar unit.
*The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such vases, shall be placed on the apparatus.
*Worded: “WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING-WATER AND MOISTURE: Unit should not be used
near water(e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken
so than objects do not fall and liquids are not spilled into the enclosure through openings.”
presence of uninsulated “dangerous voltage” within
the product’s enclosure that may be of suf-ficient
magnitude to constitute a risk of electric shock to
persons.
This symbol is intended to alert the user to the
presence of important operation and mainte-nance
(servicing) instructions in the literature accompanying
the appliance.
an extension cord, receptacle or other outlet unless the blades
can be fully inserted to prevent blade expo-sure.
fiche polarisée avec un prolongateur, une prise de courant
on une autre sortie de courant, sauf si les lames peuvent
étre insérées à fond sans en laisser aucune partie à
découvert.
EQ-2131/2231/2215
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GRAPHIC EQUALIZER
Unpacking
Please take a few minutes to read this manual to familiarize yourself with important information regarding
installation, product features, and operation.
As with most electronic devices, ORIGINAL PACKAGING (OR EQUAL) IS REQUIRED in the unlikely event that
the product needs to be returned for servicing.
Short Form Instructions
1. Prior to connecting the AC power, adjust the LEVEL slider control to the fully attenuated position (all the
way down).
2. All other sliders should be set to the “0” or center position.
3. The BYPASS switch should be in the OFF position.
4. Connect an appropriate line level input signal to either the balanced XLR or the balanced 1/4” TRS (TipRing-Sleeve) connector marked INPUTS.
5. Connect the OUTPUTS using either the balanced XLR or the balanced 1/4” TRS connector to an
appropriate device.
6. With the power switch in the OFF position, plug in the supplied Universal AC power cord to the product
and an appropriate AC source.
7. Depress the power switch to the ON position. An LED within the power switch will illuminate.
8. The product is ready for operation. Slowly increase the LEVEL slider to the desired operating level without
exceeding “0”, then make other adjustments as necessary.
9. Operate the product and the system in a manner which DOES NOT illuminate the PEAK warning indicator.
EQ-2131/2231/2215
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GRAPHIC EQUALIZER
S3125A
Installation
Installation
Environment
Never place this product in an environment which could alter its performance or reduce its service life. Such
environments usually include high levels of heat, dust, moisture, and vibration.
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide
blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus.
When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped.
S3125A
EQ-2131/2231/2215
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GRAPHIC EQUALIZER
Description
Description
- EQ-2131
This product is a 2U rack space, single channel, 31 band, graphic equalizer.
- EQ-2231
This product is a 2U rack space, dual channel, 31 band, graphic equalizer.
- EQ-2215
This product is a 2U rack space, dual channel, 15 band, graphic equalizer.
Features
Features
- Constant Q (Constant Bandwidth) filter design
- Long throw (45mm) slider controls
- Balanced XLR and balanced 1/4” TRS input and output connectors
- Selectable adjustment range of ±6dB or ±12dB
- Signal Bypass switch allows for a quick assessment of the effect of the equalizer’s settings.
- Peak warning indicator (active 6dB below peak)
- Selectable, Cut Only or Boost/Cut, operation.
- Selectable 80Hz high pass filter to reduce frequency response below 80Hz.
- Illuminated Power Switch
- Rack Ears for permanent installation in a standard 19” (rack mount width) enclosure.
- Detachable AC power cord
Accessories
One detachable AC power cord is provided for use with this product.
EQ-2131/2231/2215
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Front Panel
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67 8
32145
67 8
3145
67 8
2
EQ-2131
EQ-2231
EQ-2215
Front Panel
GRAPHIC EQUALIZER
EQ-2131/2231/2215
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GRAPHIC EQUALIZER
1. EQ BOOST / CUT CONTROL
These 45mm sliders control the amount of boost or cut applied to the indicated center frequency.
2. INPUT GAIN CONTROL
The position of the Input Gain slider determines the overall signal to the circuitry. The “0” position of each slider
indicates the position where no cut or boost occurs. This position (also known as unity gain) is the optimum position.
3. PEAK WARNING INDICATOR
This LED illuminates red whenever the corresponding input signal is within 6dB of clipping. During normal
operation the Peak Warning Indicator will remain off or only rarely illuminate. A single Peak Warning
Indicator is provided for the EQ-2131 and two are provided on the EQ-2231 and EQ-2215, one for each of
the two channels (Channel A and Channel B).
4. RANGE SWITCH
The position of this switch determines if the slider controls operate over a ±6dB or a ±12dB range in the boost/cut
mode. In the CUT ONLY mode the position of this switch changes the adjustments from -12dB to -24dB. In most
cases the ±6dB (-12dB in cut only) range is sufficient. Excessive adjustments may indicate a problem elsewhere in
the system that requires attention. A single RANGE switch is provided for the EQ-2131 and two are provided on
the EQ-2231 and EQ-2215, one for each of the two channels (Channel A and Channel B). The RANGE switch
will illuminate when engaged, effectively doubling the normal range of the slider controls.
5. CUT ONLY SWITCH
The position of this switch determines whether the corresponding slide controls perform a boost/cut or cut
only function. The switch will illuminate when the switch is in the CUT ONLY mode. In this mode, the “0”
position of the sliders is at the top of the range and any adjustment of the sliders will only attenuate the level
as indicated by the red CUT ONLY graphics. Usually -12dB of attenuation is sufficient. However the RANGE
switch can be employed to provide up to -24dB of attenuation if more than -12dB is needed. A single CUT
ONLY switch is provided for the EQ-2131 and two are provided on the EQ-2231 and EQ-2215, one for
each of the two channels (Channel A and Channel B).
6. HIGH PASS FILTER
The position of this switch determines if the 80Hz High Pass Filter is applied to the signal. The switch will illuminate
when the High Pass Filter is engaged. A single HPF switch is provided on the EQ-2131 and two are provided on
the EQ-2231 and EQ-2215, one for each of the two channels (Channel A and Channel B). This feature is
effective at removing rumble or other low frequency information (below 80Hz) which may be undesirable.
7. BYPASS SWITCH
The position of this switch determines whether the product operates normally or allows the signal to bypass
all equalization settings and pass through unaffected. The switch will illuminate when it is in the BYPASS
mode. A single BYPASS switch is provided on the EQ-2131 and two are provided on the EQ-2231 and EQ2215, one for each of the two channels (Channel A and Channel B). In the event of a loss of power, the
product will default to BYPASS mode allowing the signal to pass.
8. POWER SWITCH
The position of this switch determines whether the power is ON or OFF. The power-on status is indicated by
the LED inside the switch. In the OFF position the input(s) are hard bypassed to the output(s) to allow the
signal to pass through unaffected as it does in BYPASS.
EQ-2131/2231/2215
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