Operating Instruction Manual
ELECTRONIC MUSIC AMPLIFICATION SYSTEM
Model KD-2
Toa Electric Co., Ltd.
KOBE, JAPAN
Contents
Precautions
General Description
Features
Front Panel: Names of components & their usage
Rear Panel: Names of components & their usage
Block and Level Diagrams
Specifications
Appearance
Precautions
1
2
2
3
4
5
5~6
6
1. Power Supply
The KD-2 is designed to operate on local AC (50/60Hz) Mains, ±10%.
2. XLR Type Audio Connector
The connectors are wired as follows.
The pin 1 is ground (shield), the pin 2 cold (low, minus), the pin 3 hot (high, plus).
3. Phantom Power Supply
The phantom power switch on channel 1 input permits the user to supply 48V DC
through the input connector to a condenser microphone. If phantom power is not
required, the switch must be in the "off position.
4. Description of components and functions of the KD-2
Various descriptions are applied, depending on each manufacturer. In our
Operating and Instruction Manual explanation of components and functions is
made according to Toa's usage for them.
— 1 —
General Description
The TOA KD-2 is a complete electronic music amplification system in a single
portable package, consisting of a stereo mixer, spring reverberation unit, power
amplifier, and two-way speaker system.
The mixer section provides four discrete input channels. Each input features 2-band
active EQ, an independent effects send, a direct output, and a channel level control
with concentric stereo pan. Channel 1 features an electronically balanced XLR mic
input connector with switchable 48 volt phantom power, for use with condenser-type
microphones, and Input channels 1 and 2 feature input sensitivity switches. In
addition, channel 4 features on RIAA equalized phono input for direct connection of
magnetic cartridge turntables.
The master section contains an effects patching loop with crossfade and level controls,
Stereo L & R controls, and a stereo headphone monitoring system.
The 100 watt RMS internal power amplifier features Auto Comp compression
circuitry, with an LED indicator, to ensure distortion-free performance and protection
for the internal speaker system. The two-way speaker system utilizes a heavy duty
15-inch woofer and a constant directivity horn with piezo electric driver.
The KD-2 is covered in a durable and attractive high tech gray vinyl fabric.
Features
System Features
Each Input Channel
Four input channels
100 watts power amplifier output
Auto Comp compression circuitry w/indicator
Power amplifier protection circuitry w/indicator
Built-in heavy-duty two-way loudspeaker system of 15"(38cm) woofer and constant
directivity horn with piezo driver
Built-in spring reverberation unit
Stereo mixer section
Two band EQ
Independent effect send is post-EQ/post-fader
Direct output on each channel, ideal for recording
Concentric stereo pan and channel volume control
Input Channel 1 has electronically balanced XLR mic input connector with
switchable 48 volt phantom power
Input Channel 4 has phono (RIAA) inputs for turntable with magnetic cartridge
Input Channel 3 and 4 has Input Level Selector switches
Master Section
Level and crossfade control for returning effects signals to stereo mixing busses
Stereo Left and Right outputs with both RCA and 1/4" jacks
Headphone monitoring for Stereo Left and Right
— 2 —
Front Panel
Pan control [PAN]
The pan pot control assigns the
fader output signal of each input
channel to the Stereo Left and
Right mixing busses. At the detented center position, the pan
pot routes the signal equally to
the L and R mixing busses. Panning from one side to the other
gradually assigns th e input signal
to either the stereo L or R mixing
busses exclusively.
Effects Control [EFF]
This control determines the
amount of post-fader/post-EQ signal assigned to the effect buss
from a given input channel, and
thus the level of effects for that
channel.
Low Equalizer Control [LOW]
The low EQ control alters the low
frequency response of the input
channel, providing ±15dB at
20Hz of continuously variable active shelving equalization. The
"0" detented position provides
flat audio response.
Cross-fade Control for Reverb/ Effect
[REV/EFF X-FADE]
When this control is in the center
position, the REV RET and EFF
RET signals are equally assigned
to the stereo mixing buss. Rotating the control counter-clockwise
decreases the EFF RET signal
level, keeping the original level of
the REV RET signal. Rotating the
control clockwise decreases the
REV RET signal level, keeping the
original level of the EFF RET
signal.
Level Control for Reverb/Effect
[REV/EFF LEVEL]
This control governs the amount
of reverb signal (built-in or outboard) through the reverb return
jack (REV RET), and effect signal
returned through the effect ret urn
jack (EFF RET) to the system
mixing buss. The signals of REV
RET and EFF RET are controlled
simultaneously.
Stereo Level Control
[STEREO LEVEL]
These concentric controls determine the overall level of the
Stereo L & R output (STEREO
OUT L and R).
System Level Control
[SYSTEM LEVEL]
This control determines the over-
all level of the KD-2 system.
High Equalizer Control [HIGH]
The high EQ control alters the
high frequency response of the
input channel, providing ±15dB
at 20kHz of continuously variable
active shelving equalization: The
"0" detented position provides
flat audio response.
Input Channel Level [LEVEL]
The level control provides continuously variable adjustment of
the channel output to the Stereo
Left and Right mixing busses,
thus determining the level of that
channel in the main sound system mix. The nominal level of the
input level control is at the "0"dB
position.
Headphone Jack [PHONES]
The headphone jack will accept
any stereo headphone with 8
ohms impedance, or higher. This
jack provides the same signal as
the Stereo output L and R.
— 3 —
Power/Protect LED Indicator
[POWER/PROTECT]
The LED indicator lights red and
remains lit for 3 seconds after the
power switch has been turned on,
and then turns to green when the
KD-2 is powered up. The LED
lights red when the protection
circuit is activated.
Power Amp Compression
Indicator [COMP]
The Comp LED lights when the
internal compressor is activated.
The compressor is provided to
protect the speaker system by
compressing the input signal
level of the power amplifier when
clipping occurs in the output
stage. Frequent flashing of the
LED is not reason for alarm.
However, a constant or steady
light indicates that the KD-2 is
being overdriven and that the
internal power amplifier is possibly "under powered" for that application. The output level of the
KD-2 should be decreased until
the LED only flashes intermittent-
ly.
Rear Panel
Stereo L & R Output Jack
[STEREO OUT L/R]
The unbalanced RCA pin jacks
and 1/4" phone jacks are wired in
parallel. The RCA pin jack has a
nominal output level of –10dB
and an impedance of Ik ohms,
and t he 1/4" phone jack has a
nominal output level of +4dB
and an impedance of 1 k ohms.
All jacks may be used simultaneously.
Sum Output Jac k [SUM OUT]
The Sum Output jack has a
nominal ou tp ut level of +4dB
and an impedance of 1 k ohms.
The Sum Out put is the same
signal as the Speaker output.
Sum Input Jack [SUM IN]
Thi s 1/4" phone jack is directly
connected to the mono Sum (Sys-
tem) buss. Its nominal input level
is –10dB, with an input impedance of 10k ohms.
Effect Send Jack [EFF SEND]
This 1/4" phone jack is used in
conjunction with the Effect Return jack to connect an outboard
effects device (i.e, delay or reverb) to the KD-2. The Effect Send
jack should be connected to the
input of the Effect. Nominal output level is –10dB with an impedance of 1k ohms.
Effect Return Jack [EFF RET]
Th is 1/4" phone jack is used in
conjunction with the Effect Send
jack to connect an outboard
effects device (i.e, delay or reverb) to the KD-2. The Effect
Return jack should be connected
to the output of the effect. Nominal input level is –20dB with an
impedance of 10k ohms.
Reverb Return Jack [REV RET]
This 1/4" phone jack is used in
conjunction with the Effect Send
jack to connect an outboard effect
device (i.e, delay or reverb) to the
KD-2. The Reverb Return jack
should be connected to the output of the effect device. Nominal
input level is –20dB with an
impedance of 10k ohms. When a
plug is inserted into this jack, the
built-in reverb circuitry is automatically cut off.
Earth Terminal
This terminal can be used to
ground other devices such as tape
decks and turntable to the KD-2 to
reduce hu m and shock hazard.
And may be used to provide
ground connection for tape decks
or turntables.
Input Level/Source Selector
[PAD]
The slide switch provides 30dB
attenuation for the 1/4" Input
Jack, and RCA pin Input Jack at
the "30" position. The correct
setting should be made according
to the output level of the equip-
ment connected. For example, an
instrument with a "HOT" output
may overload the input circuitry,
resulting in a distorted or "FUZ-
ZY" sound. When using the RCA
Phono Input, select the "PHONO"
position of this switch.
AC Power Cord
The power cord is of the three-
wire type with proper grounding
facilities built-in. (6ft.)
Caution — The ground pin
should not be removed under any
circumstances. If the KD-2 must
be used without proper grounding facilities, a suitable grounding
adapter should be utilized. Op-
eration of the KD-2 with proper
grounding techniques will result
in less system noise and greatly
reduced shock hazard.
RCA Phono (RIAA) Input
[PHONO]
These RCA pin jacks have a
nominal level of –55dB and an
impedance of 50k ohms, and in-
clude RIAA phono equalization.
Input Level Selector
[PAD]
The slide switch provides 30dB
attenuation for the 1/4" Input
Jack, and RCA pin Input Jack at
the "30" po sition. The correct
setting should be made according
to the output level of the equipment connected. For example, an
instrument with a "HOT" outp ut
may overload the i nput c ircuitry,
resulting in a distorted or "FUZ-
ZY" sound.
Power Switch [POWER]
The power switch is a threeposition type with the middle
position being the "off position.
The KD-2 should be operated in
the switch position which produces the lowest amount of system
hum.
AC Fuse
Warning: To avoid possible
equipment damage and/or personnel injury, the fuse should
always be replaced with same
type and rating. Using improper
fuses will also void the warranty.
The KD-2 should always be dis-
connected from AC outlet prior to
changing fuses. If fuse repeatedly
fails, the unit should be referred
to qualified service personnel for
repair.
1/4" Phone Channel Input
[INPUT]
These connectors are unbalanced,
1/4" phone jack with an input
impedance of 100k ohms and an
input level of – 30dB. When a
plug is inserted into the 1/4" input
jack, the corresponding XLR mic-
rophone input or RCA pin channel input is automatically switch-
ed out of the input circuitry.
RCA Channel Input [INPUT]
The RCA pin input jack is unba-
lanced, with a nominal level of
–30dB and an impedance of 100k
ohms.
Direct Output [DIRECT OUT]
The Direct Output on each chan-
nel utilizes an unbalanced RCA
pin jack with an impedance of Ik
ohms and a level of –10dB. The
Direct Outp ut is post-EQ/postfader, and is useful for recording
or for sending indivi dual instruments to other equipment.
Phantom Power On/Off switch
[PHANTOM]
This switch alternately turns
"on" and "off" the phantom power (48V DC) for the XLR connector
assigned to Channel 1. The
switch should remain in the off
position when a condenser type
mic is not in
Balanced XLR Microphone Input
[MIC]
The XLR-type microphone input
connector (Channel 1 only) is
electronically balanced with a
nominal level of –60dB an d an
input impedance of 1k ohms.
Phantom powering is provided
for use with condenser-type microphones (see PHANTOM). The
microphone input is automatically disconnected when either the
corresponding RCA Pin jack or
th e 1/4" p hon e jack is used.
Speaker Jack [EXT. SP]
The external speaker output is a
standard 1/4" phone jack. Speaker
cables (recommend at least #18
gauge wire) should be connected
between the KD-2 and external
speaker systems prior to applying
power to the un it. When a p lu g is
inserted into the external speaker
jack, the internal speaker is auto-
matically switched off.
Caution — The KD-2 should nev-
er be operated into less than an 8-
ohm speaker load.
use.
— 4 —
Block and Level Diagrams
Specifications
MIXER SECTION
Frequency Response
+0, -3dB 20Hz to 20kHz (INPUT to STEREO OUT)
Total Harmonic Distortion
Less Than 0.03% +4dB* 1kHz (STEREO OUT)
Hum and Noise (STEREO OUT: Open 20Hz to 20kHz)
All Level Control Minimum –85dB
One INPUT Level Control Maximum –68dB
Equalization
LOW ±15dB 20Hz Shelving
HIGH ±15dB 20kHz Shelving
POWER AMPLIFIER SECTION
Power Output
100 watts minimum sine wave continuous average power output
monaural driving 8-ohm over a power band from 20Hz to 15kHz.
The maximum Total Harmonic Distortion (THD) at any power
level from 250 milliwatts to 100 wats shall be no more than 0.3%.
100 watts continuous average sine wave power into 8-ohm will
less than 0.02% THD at 1kHz.
Frequency Response
+0dB, –1dB 20Hz to 20kHz
Total Harmonic Distortion
Less than 0.02% at 100 watts into 8-ohm at 1kHz
Hum and Noise
–70dB below rated output (IHF-A weighted)
SPEAKER SECTION
Speaker
15"(38cm) woofer, CD horn and piezo driver
Sensitivity
97dB (1 watt 1 meter)
Frequency Response
70Hz to 20kHz
GENERAL SPECIFICATIONS
Power Consumption
200 watts maximum
Dimensions (W×H×D)
490mm×719mm×341mm
19¼"×28¼"×133/8"
Weight
26kg (57.3 lbs)
— 5 —
Specifications
INPUT SPECIFICATIONS
Input
Impedance
CHANNEL INPUT
CH1~CH4
MIC CH1
PHONO CH4
EFF RET
REV RET
SUM IN
OUTPUT SPECIFICATIONS
Output
Impedance
STEREO OUT (L, R)
SUM OUT
EFF SEND
PHONES
DIRECT OUT
Actual
Load
Actual
Source
For Use
With
Nominal
For Use
With
Nominal
Nominal
–30dB (24mV)
–60dB (0.78mV)
–55dB (1.4mV)
–20dB (78mV)
–20dB (78mV)
–10dB (245mV)
Nominal
+4dB (1.23V)
–10dB (245mV)
–10dB (245mV)
–10dB (245mV)
+4dB (1.23V)
+ 4dB (1.23V)
Input Level
Output Level
MAX. Before Clip
0dB (0.775V)
–30dB (24mV)
–25dB (44mV)
+ 10dB (2.45V)
+ 10dB (2.45V)
+ 20dB (7.75V)
0dB is referenced to 0.775V RMS.
MAX. Before Clip
+ 20dB (7.75V)
+ 6dB (1.5V)
+ 20dB (7.75V)
+ 20dB (7.75V)
+ 20dB (7.75V)
+ 20dB (7.75V)
Connector
PHONE JACK
RCA PIN JACK
XLR-3-31 TYPE
RCA PIN JACK
PHONE JACK
PHONE JACK
PHONE JACK
Connector
PHONE JACK
RCA PIN JACK
PHONE JACK
PHONE JACK
STEREO PHONE
JACK
RCA PIN JACK
EXT.
SP
Stereo phone jacks is wired:
Tip=Left, Ring=Right, Sleave=Common.
The XLR type connector is electronically balanced.
Appearance
The XLR type connector is wired as follows
Pin No.1-Ground
Pin No.2-Cold (Low)
Pin No.3-Hot (High)
Specifications are subject to change without notice.
PHONE JACK
0dB is referenced to 0.775V RMS.
— 6 —
Printed in Taiwan
133-02-839-9
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