Toa KD-2 Instruction Manual

ELECTRONIC MUSIC AMPLIFICATION SYSTEM
Operating Instruction Manual
Model KD-2
Toa Electric Co., Ltd.
KOBE, JAPAN

Precautions
General Description
Features
Front Panel: Names of components & their usage
Rear Panel: Names of components & their usage
Bloc and Level Diagrams
Specifications
Appearance
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 Conne tor
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. Des ription of omponents and fun tions 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.
— —
Contents
Pre autions

The TOA KD-2 is a complete electronic music amplification system in a single
portable pac age, consisting of a stereo mixer, spring reverberation unit, power
amplifier, and two-way spea er 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 spea er system. The two-way spea er 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.
System Features
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 loudspea er system of 15"(38cm) woofer and constant
directivity horn with piezo driver
Built-in spring reverberation unit
Stereo mixer section
Ea h Input Channel
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 Se tion
Level and crossfade control for returning effects signals to stereo mixing busses
Stereo Left and Right outputs with both RCA and 1/4" jac s
Headphone monitoring for Stereo Left and Right
— 2 —
General Des ription
Features

Pan ontrol [PAN]
The pan pot control assigns the
fader output signal of each input
channel to the Stereo Left and
Right mixing busses. At the de-
tented center position, the pan
pot routes the signal equally to
the L and R mixing busses. Pan-
ning from one side to the other
gradually assigns the input signal
to either the stereo L or R mixing
busses exclusively.
Effe ts Control [EFF]
This control determines the
amount of post-fader/post-EQ sig-
nal 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 ac-
tive shelving equalization. The
"0" detented position provides
flat audio response.
High Equalizer Control [HIGH]
The high EQ control alters the
high frequency response of the
input channel, providing ±15dB
at 20 Hz of continuously variable
active shelving equalization: The
"0" detented position provides
flat audio response.
Input Channel Level [LEVEL]
The level control provides con-
tinuously 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 sys-
tem mix. The nominal level of the
input level control is at the "0"dB
position.
Cross-fade Control for Reverb/ Effe t
[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. Rotat-
ing the control counter-cloc wise
decreases the EFF RET signal
level, eeping the original level of
the REV RET signal. Rotating the
control cloc wise decreases the
REV RET signal level, eeping the
original level of the EFF RET
signal.
Headphone Ja k [PHONES]
The headphone jac will accept
any stereo headphone with 8
ohms impedance, or higher. This
jac provides the same signal as
the Stereo output L and R.
Level Control for Reverb/Effe t
[REV/EFF LEVEL]
This control governs the amount
of reverb signal (built-in or out-
board) through the reverb return
jac (REV RET), and effect signal
returned through the effect return
jac (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 deter-
mine 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.
Power/Prote t LED Indi ator
[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
Indi ator [COMP]
The Comp LED lights when the
internal compressor is activated.
The compressor is provided to
protect the spea er 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 poss-
ibly "under powered" for that ap-
plication. The output level of the
KD-2 should be decreased until
the LED only flashes intermittent-
ly.
— 3 —
Front Panel

Stereo L & R Output Ja k
[STEREO OUT L/R]
The unbalanced RCA pin jac s
and 1/4" phone jac s are wired in
parallel. The RCA pin jac has a
nominal output level of –10dB
and an impedance of I ohms,
and the 1/4" phone jac has a
nominal output level of +4dB
and an impedance of 1 ohms.
All jac s may be used simul-
taneously.
Sum Output Ja k [SUM OUT]
The Sum Output jac has a
nominal output level of +4dB
and an impedance of 1 ohms.
The Sum Output is the same
signal as the Spea er output.
Sum Input Ja k [SUM IN]
This 1/4" phone jac is directly
connected to the mono Sum (Sys-
tem) buss. Its nominal input level
is –10dB, with an input impe-
dance of 10 ohms.
Effe t Send Ja k [EFF SEND]
This 1/4" phone jac is used in
conjunction with the Effect Re-
turn jac to connect an outboard
effects device (i.e, delay or re-
verb) to the KD-2. The Effect Send
jac should be connected to the
input of the Effect. Nominal out-
put level is –10dB with an impe-
dance of 1 ohms.
Effe t Return Ja k [EFF RET]
This 1/4" phone jac is used in
conjunction with the Effect Send
jac to connect an outboard
effects device (i.e, delay or re-
verb) to the KD-2. The Effect
Return jac should be connected
to the output of the effect. Nomin-
al input level is –20dB with an
impedance of 10 ohms.
Reverb Return Ja k [REV RET]
This 1/4" phone jac is used in
conjunction with the Effect Send
jac to connect an outboard effect
device (i.e, delay or reverb) to the
KD-2. The Reverb Return jac
should be connected to the out-
put of the effect device. Nominal
input level is –20dB with an
impedance of 10 ohms. When a
plug is inserted into this jac , the
built-in reverb circuitry is auto-
matically cut off.
Earth Terminal
This terminal can be used to
ground other devices such as tape
dec s and turntable to the KD-2 to
reduce hum and shoc hazard.
And may be used to provide
ground connection for tape dec s
or turntables.
Input Level/Sour e Sele tor
[PAD]
The slide switch provides 30dB
attenuation for the 1/4" Input
Jac , and RCA pin Input Jac 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.
RCA Phono (RIAA) Input
[PHONO]
These RCA pin jac s have a
nominal level of –55dB and an
impedance of 50 ohms, and in-
clude RIAA phono equalization.
Input Level Sele tor
[PAD]
The slide switch provides 30dB
attenuation for the 1/4" Input
Jac , and RCA pin Input Jac 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.
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 ground-
ing 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 shoc hazard.
Power Swit h [POWER]
The power switch is a three-
position type with the middle
position being the "off position.
The KD-2 should be operated in
the switch position which pro-
duces the lowest amount of sys-
tem hum.
AC Fuse
Warning: To avoid possible
equipment damage and/or per-
sonnel 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 jac with an input
impedance of 100 ohms and an
input level of –30dB. When a
plug is inserted into the 1/4" input
jac , the corresponding XLR mic-
rophone input or RCA pin chan-
nel input is automatically switch-
ed out of the input circuitry.
RCA Channel Input [INPUT]
The RCA pin input jac is unba-
lanced, with a nominal level of
–30dB and an impedance of 100
ohms.
Dire t Output [DIRECT OUT]
The Direct Output on each chan-
nel utilizes an unbalanced RCA
pin jac with an impedance of I
ohms and a level of –10dB. The
Direct Output is post-EQ/post-
fader, and is useful for recording
or for sending individual instru-
ments to other equipment.
Phantom Power On/Off swit h
[PHANTOM]
This switch alternately turns
"on" and "off" the phantom pow-
er (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 use.
Balan ed XLR Mi rophone Input
[MIC]
The XLR-type microphone input
connector (Channel 1 only) is
electronically balanced with a
nominal level of –60dB and an
input impedance of 1 ohms.
Phantom powering is provided
for use with condenser-type mic-
rophones (see PHANTOM). The
microphone input is automatical-
ly disconnected when either the
corresponding RCA Pin jac or
the 1/4" phone jac is used.
Speaker Ja k [EXT. SP]
The external spea er output is a
standard 1/4" phone jac . Spea er
cables (recommend at least #18
gauge wire) should be connected
between the KD-2 and external
spea er systems prior to applying
power to the unit. When a plug is
inserted into the external spea er
jac , the internal spea er is auto-
matically switched off.
Caution — The KD-2 should nev-
er be operated into less than an 8-
ohm spea er load.
— 4 —
Rear Panel

MIXER SECTION
Frequen y Response
+0, -3dB 20Hz to 20 Hz (INPUT to STEREO OUT)
Total Harmoni Distortion
Less Than 0.03% +4dB* 1 Hz (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 20 Hz 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 15 Hz.
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 1 Hz.
Frequen y Response
+0dB, –1dB 20Hz to 20 Hz
Total Harmoni Distortion
Less than 0.02% at 100 watts into 8-ohm at 1 Hz
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)
Frequen y Response
70Hz to 20 Hz
GENERAL SPECIFICATIONS
Power Consumption
200 watts maximum
Dimensions (W×H×D)
490mm×719mm×341mm
19¼"×28¼"×133/8"
Weight
26 g (57.3 lbs)
— 5 —
Blo k and Level Diagrams
Spe ifi ations

INPUT SPECIFICATIONS
Input
CHANNEL INPUT
CH1~CH4
MIC CH1
PHONO CH4
EFF RET
REV RET
SUM IN
Actual
Load
Impedance
For Use
With
Nominal
Input Level
Nominal
–30dB (24mV)
–60dB (0.78mV)
–55dB (1.4mV)
–20dB (78mV)
–20dB (78mV)
–10dB (245mV)
MAX. Before Clip
0dB (0.775V)
–30dB (24mV)
–25dB (44mV)
+ 10dB (2.45V)
+ 10dB (2.45V)
+ 20dB (7.75V)
Connector
PHONE JACK
RCA PIN JACK
XLR-3-31 TYPE
RCA PIN JACK
PHONE JACK
PHONE JACK
PHONE JACK
0dB is referenced to 0.775V RMS.
OUTPUT SPECIFICATIONS
Output
STEREO OUT (L, R)
SUM OUT
EFF SEND
PHONES
DIRECT OUT
EXT. SP
Actual
Source
Impedance
For Use
With
Nominal
Output Level
Nominal
+4dB (1.23V)
–10dB (245mV)
+4dB (1.23V)
–10dB (245mV)
+ 4dB (1.23V)
–10dB (245mV)
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
PHONE JACK
PHONE JACK
STEREO PHONE
JACK
RCA PIN JACK
PHONE JACK
Stereo phone jac s is wired:
Tip=Left, Ring=Right, Sleave=Common.
The XLR type connector is electronically balanced.
The XLR type connector is wired as follows
Pin No.1-Ground
Pin No.2-Cold (Low)
Pin No.3-Hot (High)
0dB is referenced to 0.775V RMS.
Specifications are subject to change without notice.
— 6 —
Spe ifi ations
Appearan e

Printed in Taiwan
133-02-839-9