Kenwood KR-4070 Instruction Manual

 AM-FEM STEREO RECEIVER
KR-407Q0
INSTRUCTION MANUAL
the sound approach to quality |
KENWOOD
INTRODUCTION
The purpose of this manual is to acquaint
you with the operating features of your new
receiver. You will notice that in every detail of
planning. engineering, styling, operating con-
venience, and adaptability, we have sought to an-
ticipate your needs and desires.
We suggest that you read this manual
carefully. Knowing how to set up your receiver,
to the best advantage, will enhance your listening
pleasure right from the start. You will also
become aware of the ease with which you can
adjust your receiver to meet your special re-
quirements.
SERIAL NUMBER
Record your SERIAL NUMBER on the
spaces designated on the warranty card. You will
find the serial number on the back of the unit.
AFTER UNPACKING
After unpacking, we recommend you inspect
and examine the unit for any possible shipping
damage. If your unit is damaged or fails to
operate, notify your dealer immediately. If your
unit was shipped to you directly, notify the
shipping company without delay. Only the
consignee (the person or company receiving the
unit) can file a claim against the carrier for
shipping damage.
We recommend you retain the original
carton and packing matenals to prevent any
damage should you transport or ship your unit in
the future.
PRECAUTIONS ON INSTALLATION
al Avoid locations subject to direct sunlight.
b} Avoid high or low temperature extremes.
c) Keep the unit away from heat radiating
source and magnetism generating source.
d) Choose locations with as little vibration and
dust as possible.
WARNING:
TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOIS-
TURE.
2 KR-4070(K)
IMPORTANT!
1. Units shipped to U.S.A. and Canada are
+ designed to operate on 120 volts AC only
and are not equipped with an AC Voltage °
Selector Switch. „Therefore, the following‘
description on such’ a switch should be
| “disregarded. .. В 4
-2. Units shipped to all other countries are 2
equipped ‘with an AC Voltage Selector “
Switch on the rear panel. The following :
description on this switch, “AC Voltage: +
Selection”, ‚should be carefully read. |”
AC VOLTAGE SELECTION
This unit operates on 120 volts, 220 volts or
240 volts AC. The AC Voltage Selector Switch is
set to the voltage generally available in the
country where the unit is shipped. It is important
to make sure, before connecting the power cord to
your AC outlet, whether the setting position of this
switch corresponds to your voltage. If not, it must
be changed to the proper setting in accordance
with the direction below.
NOTE:
Our warranty does not cover damage caused by excessive
line voltage due to improper setting of the AC Voltage
Selector Switch.
Stopper plate
; , Screw
Lever &
AC 120V ~ [|
Position
AC 240V ~
Position
©
a; 7
(|) Position |)
a e
© ©
©
1. Remove screw and stopper plate.
2. Slide lever to your line voltage.
3. Lock lever with stopper plate and screw.
AC VOLTAGE SELECTOR SWITCH
FEATURES EEE 3
INTERCONNECTING DIAGRAM ........... eee eee nana ananas ane nana na 4
CONTROLS AND THEIR FUNCTIONS eee acer e crane 5
CONTENTS CONNECTING INSTRUCTIONS 20 eee eee re rene re cena ren nan 6
OPERATING INSTRUCTIONS... Lace crane 10
POINTS TO BE CHECKED PRIOR TO SERVICING ....................... 12
SPECIFICATIONS aereas 12
FEATURES
Low noise cascade junction type FET and
frequency linear type precision 3-ganged var-
¡able capacitor are employed in the FM front
end. These are followed by high selective IF
section and phase locked loop system IC in
the MPX circuits. These highly reliable
elements will give you stable FM reception.
. AM section is equipped with high selectivity
ceramic filter and high performance dual-in-
line type IC. This will promise you optimum
reception.
Employs large size of signal and tuning
meters.
Employs large size of dial stroke of 10-5/8"
{270 mm).
Equipped with convenient muting circuit
which automatically silences interstation
noise,
40 watts per channel, minimum RMS at 8
ohms, from 20 Hz to 20 kHz with no more
than 0.1% total harmonic distortion.
7.
10.
11.
12.
13.
Power amplifier section employs differential
amplifier with high stability and low
distortion in first and second stages, and, di-
rect coupled circuit, in all stages.
Adoption of the Kenwood ASQ (area of safe
operation) detection limiter system for the
protection circuit which protects power tran-
sistor.
Pre-amplifier is equipped with operational IC
amplifier of single-in-line type, and this will
assure you low noise, low distortion and
increase of dynamic range.
Devised to improve stability in power source
and sound quality by employing two electro-
lytic capacitors of 7500uF.
Decreased wires thanks to a large-sized
printed circuit board.
Two pairs of speakers can be used.
Equipped with a massive heat sink.
KR-4070iK; 3
INTERCONNECTING DIAGRAM
OUTDOOR FM ANTENNA T-TYPE FM ANTENNA
TAPE DECK
When a 75 ohm antenna is used for
connecting to the antenna terminals,
the 300 chm terminals should not be
used, and conversely.
750
coaxial
cable 3000 feeder
AM FERRITE BAR ANTENNA
Es See page 9.
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ANTENNA GND INPUT ——TAPE—
FM PHONG AUX] PLAY Rec/PLAY REC
BE e
TO AC OUTLET
TO AM OUTDOOR DIN cord
ANTENNA
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TURNTABLE TAPE DECK SPEAKER SYSTEMS A SPEAKER SYSTEMS B
4 KR-4070(K)
CONTROLS AND THEIR FUNCTIONS
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(D POWER/PHONES/SPEAKERS switch
A combined switch for power. headphones and speaker
selection.
POWER OFF........ Receiver off.
PHONES .............. Speakers cut off (headphones can be
used).
A To listen to speakers connected to the
SPEAKERS A terminals.
- To listen to speakers connected to the
SPEAKERS B terminals.
AFB... To listen simultaneously to speakers
connected to the A and B SPEAKERS
terminals.
(2) PHONES jack
Insert a stereo headphone plug into this jack for private
listening. The speakers are silenced when the SPEAKERS
switch is set to PHONES position.
(3) BASS and TREBLE controls
BASS control ....... Turning it clockwise increases low fre-
quencies and counterclockwise
decreases it.
TREBLE control... Turning it clockwise increases high
frequencies and counterclockwise
decreases it.
(4) BALANCE control
This control adjusts unequal volume from any program
source in right and left channels. The left channel is
accentuated when this control is turned from center toward
the left side, and conversely.
(5) VOLUME control
This control adjusts simultaneously volumes in both chan-
nels {right and left). Set it to your own most satisfactory
listening level,
(6) LOUDNESS switch
This switch boosts bass and treble tones at low listening
levels. Qur ears have less sensitivity to low and high
frequencies at low listening levels and this switch
compensates for this deficiency. This switch should be off
when listening at normal and high levels.
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7) TAPE switch
Depress this switch when using a tape deck for tape
playback. or when monitoring a tape during recording.
NOTE:
Except for tape playback, make sure it is in the
SOURCE” position.
SELECTOR switch
Switch positions and functions are as follows:
AM arr eue To receive AM broadcast.
AUTO/MUTING ... To receive both FM mono and stereo
broadcasts. Automatic switching
operates between FM mono and stereo
broadcast. This position also silences
the interstation noise on the FM band.
MONO... To receive FM mono broadcast.
PHONO ................ To operate a turntable connected to
the PHONO jacks.
АЧХ... To select source connected to the AUX
jacks.
(9) TUNING knob
Select the desired AM or FM station while observing the
SIGNAL and/or TUNING meters for optimum tuning.
FM STEREO indicator
With the SELECTOR switch set to AUTO/MUTING position,
the STEREO indicator lights during an FM stereo broadcast
reception. However, it does not light during an FM mono
broadcast reception.
(D TUNING meter
This meter is used for precise tuning to the center of an FM
channel. Turn the tuning knob until the meter pointer is in
the center of the meter scale. This provides maximum
separation and minimum distortion.
12 SIGNAL meter
This meter indicates signal strength for AM and FM.
Maximum deflection indicates best receiving condition.
KR-4070iK) 5
CONNECTING
SPEAKER CONNECTION
In connecting only one pair of speakers, con-
nect the right speaker to [R] and the left speaker
to | L| of the SPEAKERS A terminals. Should (+)
or (—) of either right or left channel be reversely
connected, sounds at the center section will be
adversely affected by the lack of separation. To
connect an additional pair of speakers, connect
the right speaker to [R] and the left speaker to
of the SPEAKERS B terminals.
Sound cannot be heard when the SPEAK-
ERS switch on the front panel is set to the A+B
position and only one pair of speakers (connected
to either SPEAKERS A terminals or B ones) are
used. This is because À and B speaker circuits are
in series and is not an indication of any trouble.
When connecting the speaker leads to the
speaker terminals, make sure that the bare wires
at the tips of the speaker leads do not touch the
adjacent terminal.
It is recommended that the wires of
individual speaker lead tips are soldered or they
are stranded together to eliminate any possibility
of short-circuits forming in the speaker connecting
network.
INSTRUCTIONS
MD Remove insulation
from lead tip.
@ Strand wire.
Insert the
Loosen the
screw wire
Tighten the
screw
NOTE:
The impedance of each speaker should be 4 ohms or more
when only one pair of speakers are used or when two pairs
of speakers are simultaneously used (A+B).
SPEAKER TERMINALS
PHASING OF THE SPEAKERS
Speaker phasing can be determined in the following manner;
1. Set the SELECTOR switch to FM (MONO).
2. Adjust the VOLUME control to the desired listening level.
3. if the sound comes directly from the front, the speakers are in phase. If the sound
comes from both sides and there is a noticeable loss in low frequencies, the speakers
are out of phase. In this case reverse the leads on one speaker.
Rett) (LEFT)
6 KR-4070(K)
CONNECTING
TURNTABLE CONNECTION
The two shielded audio cables from your
stereo turntable are normally terminated with
phono plugs. Connect the left channel of the
turntable to | L| of the INPUT PHONO jack and the
right channel to (R! of the INPUT PHONO jack.
If the turntable has a grounding wire, con-
nect it to this unit's GND terminal to avoid hum.
TAPE DECK CONNECTION
Recording
A tape deck can be connected for recording
as follows: the left channel input of the tape deck
to of the TAPE REC jack. the right channel
input of the tape deck to | R] of the TAPE REC jack.
Playback
A tape deck can be connected for playback
as follows: the left channel output of the tape deck
to of the TAPE PLAY jack. the right channel
output of the tape deck to [R: of the TAPE PLAY
jack. `
DIN CONNECTOR (REC/PLAY CONNECTOR)
If your tape deck is equipped with a DIN
connector, connect it to the TAPE REC/PLAY
connector with a DIN connecting cord. A DIN
connector enables recording and playback with
this single cord.
NOTES:
1) Please note that the REC/PLAY connector corresponds
to the TAPE REC and PLAY — the signal must be con-
trolled with TAPE switch on the front panel. >
2) When a DIN cord is used for connecting to the tape
deck. the PLAY and REC jacks should not be used.
AUX (AUXILIARY INPUTS)
High level AUX input jacks are for mis-
cellaneous sources, such as extra tape decks, TV
sound outputs, and other external components.
INSTRUCTIONS
TURNTABLE
GND INPUT
PHONG AUX
o
Q Po
TI я я Ground wire
TAPE DECK
LINE
OUTPUT
FT
TT
с -ТАРЕ—— —
LAY |PREC/PLAY REC
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ут
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AC OUTLETS
The AC outlets on the rear panel of the
receiver may be used to supply power to other
components, such as a turntable, tape deck, etc.
1. SWITCHED outlet
This outlet is controlled by the POWER
switch on the front panel. (The capacity is
200 watts maximum.)
2. UNSWITCHED outiet
This outlet delivers power at all times. (The
capacity is 200 watts maximum.)
NOTES:
1) Units shipped to the European countries are not
equipped with the AC OUTLETS.
2) Do not connect any equipment whose power consump-
tion exceeds the capacity of each outlet.
KR-4070(x) 7
CONNECTING
FM ANTENNA CONNECTIONS
Since FM broadcast signals travel along a
straight and direct-line path, they become rather
weak behind hills and buildings even in the vicinity
of a transmitting station. FM signals also become
weak in areas distant from a station even though
there may not be any obstruction to the direct-line
path of the signal. Therefore, a good FM antenna
should be installed in the most effective manner
for the best possible FM reception.
FM Outdoor Antenna
In areas at a greater distance from the
transmitting station, the use of an outdoor
antenna is highly recommended. It is available in
various types. For reception of stations located in
many directions, a non-directional type antenna
will offer better results. When using a directional
antenna, always orient it for the best reception of
the desired station. The correct position will be
indicated by maximum deflection of the SIGNAL
meter on the unit.
Connections should be made as indicated by
figures. Keep FM antennas away from roads to
avoid noises made by the ignition of car.
motorcycle, etc.
NOTE:
Consult audio dealer for detailed information of FM outdoor
antenna installation.
T-type Antenna
In areas close to the transmitting station, a
simple T-type antenna may suffice. It should be
remembered, however, that the pickup of
reflections (similar to “ghosts” on TV} will result in
poor stereo reception.
These reflections must therefore be reduced
to a minimum, either by careful orientation of the
indoor T-type antenna or, if this will not eliminate
them, by using a more directional outdoor type
antenna.
Spread the 2 arms of the antenna horizontal-
ly and while listening to an FM station, position
them for the best reception. The antenna can then
be taped to a wall or ceiling.
8 KR-4070(K}
INSTRUCTIONS
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CONNECTING
AM ANTENNA CONNECTION
Normally, position the ferrite bar antenna
for best reception while listening to an AM station
as described on page 10.
AM Indoor Antenna
The ferrite bar antenna employed on the rear
panel assures optimum AM reception.
AM Qutdoor Antenna
In fringe areas or in locations surrounded by
steel frame buildings where satisfactory reception
cannot be obtained with the ferrite bar antenna,
an AM outdoor antenna should be connected to
the AM terminal.
GROUND
It is advisable to connect the GND terminal
on the rear panel to the ground by using a buried
grounding rod or iron-made water pipe to reduce
the noise and ensure safety. However, never use
a gas pipe for this purpose.
DIN-TYPE ANTENNA JACKS
Units shipped to European countries are
equipped with the DIN-type antenna jacks on the
rear panel.
NOTE:
Consult audio dealer for detailed information on making con-
nections.
INSTRUCTIONS
Keep the AM ferrite Dar antenna away
from the rear panel.
AM ANTENNA SETTING
antenna jacks
separator
coaxial cable
DIN-TYPE ANTENNA CONNECTOR
ANTENNA GND
FM
3000
= ©
Wop
© Ox © Ground wire
GND AM rr |
2 “op ROUND
“—— TO OUTDOOR AM ANTENNA
To KR-4070
DIN- type feeder
To DIN antenna
outlet
PRECAUTIONS FOR SAFETY
e Switch off the unit and disconnect the power plug
from your AC outlet immediately if the abnormality
(smell, smoke, etc.) should take place.
® When you connect or disconnect the power plug from
your AC outlet, never do it with wet hands to avoid
unexpected accident from electric shock. Besides. do
it by holding the power plug itself.
® Disconnect the power plug from your AC outlet when
it begins to thunder terrifically. Also. it is safe to
disconnect the antenna feeder (or coaxial cable) from
the unit if an outdoor antenna is installed. Do not
touch the antenna feeder {or coaxial cable) discon-
nected then.
® It is desirable to disconnect the power plug from your
AC outlet when you leave your house for a long time.
* * *
The power cord must not be pulled strongly, nor bent
forcibly, nor scratched, nor extended by connecting an
extra cord. This will damage the cord and be a cause
of electric shock and a fire.
Do not put a heavy thing on the power cord.
a * *
Do not put on and near the unit what contains water
(vase. etc.).
Do not put in the unit the inflammable (paper, cellu-
loid, etc.) and the metal (needle, hairpin, coin, etc.).
* * *
Never dismantle the case from the unit and touch the
internal part. Never modify the internal part.
Otherwise, the danger of electric shock will be in-
curred.
KH-40701K)
9
OPERATING
INSTRUCTIONS
TAPE
LOUDNESS
Bs.
Lil
es.
L
VOLUME
BALANCE
Y
Y
TREBLE
e BASS
7
Ÿ
Next, turn on the unit and set the SPEAKERS switch to “PHONES”, “A”,
accordance with the item to be operated.
Prior to turning on the unit, set each control and switch as below.
SOURCE”
“OFF”
“MIN”
Center Position
Center Position
Center Position
“B” or "A+B" in
FM RECEPTION
1.
2.
Set the SELECTOR switch to FM AUTO
MUTING.
Turn the TUNING knob to select your sta-
tion. Best reception is obtained when the
TUNING meter pointer is exactly in the
center and the SIGNAL meter pointer
deflects to the extreme right.
TUNING
FM Reception
3. Adjust volume and tone quality.
NOTE:
It may be impossible to eliminate noise from an FM stereo
broadcast if the signal is extremely weak. In such a case
the relative signal strength can be improved by setting the
SELECTOR switch to FM MONO. While the stereo effect
will be lost, a great deal of the noise can be substantially
eliminated. ;
10
KR-4070{K)
AM RECEPTION
—
Set the SELECTOR switch to AM.
Turn the TUNING knob to select your sta-
tion. Best reception is obtained when the
SIGNAL meter pointer deflects to the ex-
treme right.
AM Reception
Adjust volume and tone quality.
TURNTABLE OPERATION
1.
Set the SELECTOR switch to PHONO.
2. Operate the turntable.
3. Adjust volume and tone quality.
AUX JACKS UTILIZATION
To play component connected to. the AUX
jacks, proceed as follows:
1.
Set the SELECTOR switch to AUX.
2. Operate the component connected.
3. Adjust volume and tone quality.
OPERATING
TAPE DECK OPERATION
Playback
1. Set the TAPE switch to PLAY (depressed
position). The SELECTOR switch can be in
any position.
2. Operate the tape deck.
3. Adjust volume and tone quality.
Monitoring
If you use the unit with 3-head type tape
decks, you can check the sound quality of the
recording by momentarily comparing the recorded
signal with the source signal as follows.
e Set the TAPE switch to PLAY to monitor the
recorded sound.
e Set the TAPE switch to SOURCE to monitor the
source signal before recorded.
Recording
1. Set the SELECTOR switch to the source to
be recorded as shown in the figure (right
middle).
2. Operate the selected source (component)
and the tape deck.
3. Adjust recording levels with the tape decks
control.
4. To check recording conditions, set the TAPE
switch to PLAY (depressed position).
NOTE:
Recording is not affected by the unit's controls such as
VOLUME, BASS, TREBLE, LOUDNESS and BALANCE,
Tape-To-Tape Dubbing (Duplicating)
1. Connect two tape decks as shown in the
figure {right bottom).
2. Set the SELECTOR switch to AUX and
operate the tape deck connected to the AUX
jacks as the program source.
3. Record the program onto the tape deck con-
nected to the TAPE jacks, controlling the
recording level with the controls on that
deck.
4. To check recording conditions, set the TAPE
switch to PLAY (depressed position).
INSTRUCTIONS
TAPE DECK
TAPE SWITCH 1¢
SELECTOR pm 4
SWITCH
RECORDING
TAPE DECK (for playback)
—
TAPE DECK (for recording)
LINE
OUTPUT
AM, FM
J —1
SELECTOR I TAPE SWITCH q
SWITCH
PHONO
TAPE-TO-TAPE DUBBING
PRECAUTIONS ON CLEANING
Do not use volatile liquid such as alcohol, thinner, gas-
oline, benzine, etc., when cleaning the unit surface. Use
silicon cloth or soft dry cloth.
KR-4070(K) 11
"POINTS TO BE CHECKED PRIOR TO SERVICING
Occurs Only During AM Reception
Correction
Continuous low frequency buzz.
Most noticeable at night on weak signal
stations.
Continuous high frequency whine increases
at night.
i
|
Erecting a 10-meter outdoor antenna and securing good ground conditions should reduce
interference considerably. Complete elimination is difficult.
Turn TV off. (Neighboring TV set may also be cause.) Impossible to eliminate from
receiver side.
Occurs Only During FM Reception
Correction
Continuous hiss or buzzing interference
with broadcast.
Erect outdoor FM antenna if only indoor T-type is used. An antenna with more than 5
elements is necessary if you are located at a considerable distance from the transmitting
Becomes louder during stereo. station.
During AM, FM or Turntable
Correction
No sound from LEFT and RIGHT.
Sound only from one side.
Check connections from receiver output to speakers.
Set to appropriate volume level.
Always set to SOURCE except when using tape decks.
Check receiver output and speakers connections.
During Record Playback Only
Correction
No sound from LEFT and RIGHT, or sound
only from one side.
Sound audible but background hum occurs.
Howling noise occurs when volume is
raised or bass response is increased.
See that turntable output cord is firmly plugged into receiver input.
Keep turntabie output cord away from AC cords. Choose cord paths which keep hum at a
minimum. Twist LEFT-RIGHT turntable output cords together. Reverse turntabte AC plug
connections. Connect turntable groundwire to GND terminal.
Increase distance between turntabie and speakers. Choose speaker locations carefully.
Remember. loose flooring induces howling.
SPECIFICATIONS
AMPLIFIER SECTION
Power Output
40 watts* per channel, minimum RMS at 8
ohms, from 20 Hz to 20,000 Hz with no more
than 0.1% total harmonic distortion
40 + 40 watts 8 ohms at 1.000 Hz
47 + 47 watts 4 ohms at 1,000 Hz
190 watts 4 ohms
0.1% at rated power into 8 ohms
0.05% at 1 watt into 8 ohms
0.1% at rated power into 8 ohms
0.05% at 1 watt into 8 ohms
10 Hz to 40.000 Hz
Both Channels Driven:
Dynamic Power Output:
Total Harmonic Distortion: :
Intermodulation Distortion:
(60 Hz : 7 kHz = 4: 1)
Power Bandwidth:
Damping Factor: 40 at 8 ohms
Speaker Impedance: Accept 4 ohms to 16 ohms
Input Sensitivity/impedance/Signal to Noise Ratio {IHF A Curve):
Signal to Noise Ratio at 65 dBf:
{Mono}: 72 dB
(Stereo): 67 dB
T.H. Distortion at 65 d Bf:
(Mono): 0.15%
(Stereo): 0.25%
Frequency Response: 20 to 15.000 Hz + 0.5 dB. —2.0 dB
Capture Ratio: 1.0 dB
Alternate Channel Selectivity: 60 dB
Spurious Response Ratio: 75 dB
Image Response Ratio: 45 dB
IF Response Ratio (Balanced): 95 dB
AM Suppression Ratio: 53 dB
Stereo Separation: 43 dB at 1.000 Hz "
35 dB at 50 to 10.000 Hz
Sub Carrier Product Ratio: 40 dB
Antenna Impedance:
FM Frequency Range:
300 ohms balanced and 75 ohms unbalanced
88 MHz to 108 MHz
Phono: 2.5 mV/50k ohms/73 dB AM TUNER SECTION
AUX: 150 mV/45k ohms/95 dB Usable Sensitivity: 16 uV
Tape: 150 mY/45k ohms/95 dB Signal to Noise Ratio: 50 dB
Maximum Input Level for image Rejection: 50 dB
Phono: 190 mY (rms), TH.D. 0.1% at 1,000 Hz Selectivity: 34 dB
Output Level/Impedance:
пре GENERAL
Tape REC DIN): BOL cpm Power Consumption: 300 watts at full power
Frequency Response: A.C. Outlet: Switched 1, Unswitched 1
Phono: RIAA standard curve +0.3 dB, —0.3 dB Dimensions: NE 126 mM
Tone Cot: 15 Hz to 70.000 Hz +0 dB, — 1.0 аВ D 14.3/16” (360 mm)
Treble: +8 dB at 10,000 Hz
loudness Control { —30 dB): +9 dB at 100 Hz
+5 dB at 10.000 Hz
FM TUNER SECTION (IHF)
Usable Sensitivity:
50 dB Quieting Sensitivity:
(Mono):
(Stereo):
10.8 dBf (1.9 uv)
15 dBf (3.1 pV)
37.2 dBf (40 uv)
*Measured pursuant to Federal Trade Commission's Trade Regulation rule
on Power Output Claims for Amplifier in US A
Note:
Kenwood follows a policy of continuous advancements in development.
For this reason, specifications may be changed without notice.
PRINTED IN JAPAN B50-1630-00 (KUMXWL) (G)
X//48 D12345/847 67850N/848 D12345/949 67890N/950 D12345/051