Toa E 111, E 112 User Manual
Operating Instruction Manual
TOA PROFESSIONAL GRAPHIC EQUALIZER
Model E 111, E 112
E 112
E 111
TOA ELECTRIC CO, LTD.
KOBE, JAPAN
Contents
Precautions
General
Features
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Description
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Specifications
Appearance
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Performance
Front
Rear
Panel
Panel
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Input/Output
Installation
Functions
Precautions
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Applications
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Graphs
Connections
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1
2
2
3
3
4
5
6
7
7~8
8
9~10
Precautions
1. XLR type audio connectors are wired as follows.
Pin 1 is ground (shield), pin 2 is cold (low, minus), and pin 3 is hot (high,
plus).
2. Each model of the E 111 and E 112 has two versions, 120V AC operation only
and 220/240V AC operation with a voltage selector. The voltage selector on
the rear panel of the 220/240V version should be checked for proper setting
prior to operation as improper setting causes trouble. The voltage selector is
set for 240V operation at the factory.
3. Do not operate the equalizer from power mains which exceeds the indicated
mains voltage by more than 10%.
4. Do not expose the equalizer to corrosive chemicals or liquids such as soft
drinks, salt water, etc.
5. Always refer the equalizer to qualified technical service personnel. There
are no user serviceable parts inside.
— 1 —
General Description
The TOA E 111 is a single channel, 1/1 octave active graphic equalizer designed
to allow clean, accurate audio equalization for stage, studio, or commercial
applications, while the E 112 is a double channel version.
The E 111 and E 112 provide 12dB of boost or cut at each of its 10 frequencies per
channel, which are centered at ISO 1/1 octave increments from 31.5Hz to 16kHz.
The center frequency of each filter is continuously variable over a range of one
octave and the "Q" of each filter is continuously variable from 1.5 to 8. Its signal
to noise ratio is over 120dB making the E 111 and E 112 one of the quietest
equalizers on the market.
The active bandpass/bandreject filters of the E 111 and E 112 are designed for
minimum phase shift, and feature smooth slide controls with center detents for
easy and accurate adjustment. The filters are summed in parallel for reliability,
so that the failure of one filter does not interrupt operation of the others.
In addition, high-pass and low-pass filters are provided on the front panel. The
high-pass filter has a slope of 12 dB per octave and its cutoff frequency is 40Hz,
while the low-pass filter has a 12 dB per octave slope and its cutoff frequency is
12kHz.
An input level control on the E 111 or E 112 gives 12 dB of adjustment to allow a
wide variety of input sources. An LED indicator illuminates when either the
input or the output comes within 6 dB of clipping. In addition to the usual EQ
in/out switch, an automatic EQ bypass function provides complete equalization
bypass in the event of loss of AC power, and an output muting function
suppresses turn-on/turn-off transients.
A smoked plastic security cover is included with the E 111 or E 112 to guard
against accidental disturbance, or intentional tampering when used in fixed
installations.
Inputs and outputs are transformer-isolated and balanced, with both XLR and
1/4" stereo phone jacks. Ground lift switches are provided at both inputs and
outputs to reduce hum and prevent ground loops.
The E 111 and E 112 can be mounted in a standard 19" rack and occupy 5-1/4" of
vertical space. The rugged front panel is made of 1/8" (3mm) cast aluminum,
backed with a 1/8" (3mm) steel liner for added durability.
Features
1. 10 filters per channel on ISO 1/1 octave
center frequencies from 31.5Hz to 16kHz.
2. 12dB boost or cut at each center frequency,
continuously variable.
3. Continuously variable center frequency
control at each frequency over a one octave
range.
4. Continuously variable "Q" control at each
frequency from 1.5 to 8.
5. Signal to noise ratio greater than 120dB.
6. High quality, low phase-shift active filters.
7. Precision calibrated, noiseless slide controls
with center detent.
8. Equalizer In/Out switch.
9. High- and low-pass filters.
10. LED peak indicator to detect clipping at input
or output levels.
11 Variable input level control to accept variety
of input sources.
12. Automatic EQ bypass circuitry.
13. Transformer-isolated balanced inputs and
outputs with XLR connectors and phone
jacks.
14. Ground lift switches on input and output.
15. Smoked, plastic security cover is included.
16. Heavy aluminum die-cast front panel, stand-
ard 19" rack mountable.
— 2 —
Specifications
Frequency Response
±ldB, 20Hz to 20kHz
Total Harmonic Distortion
Less than 0.2% at 1kHz, all sliders at 0
position, rated output
Equalization Center Frequencies
From 31.5Hz to 16kHz
peaking type
31.5Hz (22Hz to 44Hz)
63Hz (44Hz to 88Hz)
125Hz (88Hz to 176Hz)
250Hz (176Hz to 350Hz)
500Hz (350Hz to 700Hz)
1kHz (700Hz to 1.4kHz)
2kHz (1.4kHz to 2.8kHz)
4kHz (2.8kHz to 5.5kHz)
8kHz (5.5kHz to 11kHz)
16kHz (11kHz to 22kHz)
Range of Adjustment of "Q"
1.5 to 8
Equalization Control
±12dB
Input Level Control
±12dB
Rated Input Level
+4dB
Rated Output Level
+4dB
Maximum Input Level
+24dB* at 1kHz
Maximum Output Level
+24dB* with 600-ohm load
Input Impedance
10k ohms
Output Impedance
600 ohms
High Pass Filter
40Hz, 12dB/octave
Low Pass Filter
12kHz, 12dB/octave
Hum and Noise
-103dB* (EQ IN, all sliders at 0 position, A
curve by IHF)
Protect
AC fail safe
Power Consumption
E 111: 10W
E
112:
19W
Dimensions
483(W)×l33(H)×370(L) mm
19(W)×5.25(H)×l4.6(L) inches
Weight
E 111: 7.6kg (17 lbs)
E 112: 8.8kg (19 lbs)
Finish
Black
Indicators
Peak Indicator LED turns on at 6dB before
clipping
EQ, Power Indicators Green Color LED
Accessories
AC Cord, Cord Clamp
*0dB is referenced to 0.775 volts RMS.
Appearance
The E 111 is the same in dimension as the E 112.
— 3 —
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