Pioneer SX-950 Stereo Receiver Operating Instructions

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Pioneer SX-950 Operating Instructions | Manualzz
 AM/FM STEREO RECEIVER
X-3
50,
OPERATING INSTRUCTIONS KU
a
ce
_ i Lo a i A RAR Qh
ll! | |
Walnut veneered top and side panels are used in the construction
of this cabinet.
T
WARNING: TO PREVENT FIRE OR SHOCK HAZARD,
—! DO NOT EXPOSE THIS APPLIANCE TO RAIN OR
M PIONEER MOISTURE.
|
|
CONTENTS
Stereo System Composition ............. 2 Tape Deck Operation ......... feas e. 19
SX-950 Features ....... Tune e «Это Te IY 3 Adaptor Jacks for Increased Versatility .... 14
Connection Diagram ........... Te 4 Employing PRE OUT and
POWER IN Jacks <:..... +-...00 - >. ec ... e - 16
Connections ......e..eoeoseecoroeoorerara 6
Antenna and Ground Connections ......... 7 Conditions Frequently Mistaken for
Malfunction ..... ee, шо A ae... el
F P F 1 1 les ..... * - - * - - - - - - - - a - * -
Font PRE Racines 8 Specifications ...................... .. 18
How to Operate the Receiver ............ 10
STEREO SYSTEM COMPOSITION
Tape Deck
® Be sure to install reel clamps when using vertically. Turntable |
e Always keep heads clean. e Protect from vibrations and close dust cover whenever possible.
e Do not neglect recorded tape for long periods. e Store records vertically and protect from dust and dirt.
e Avoid magnetic fields.
SN Speaker System
Rear and side panels of left
and right speakers should have
the same surroundings.
(Placing with rear panel against
a wall improves bass)
Install speakers so that vibra
tions are not transferred di
rectly to the floor.
(Employ stands or concrete
— blocks with bookshelf туре
speakers)
Thick curtain shuts
out direct sunlight.
SX-950 (Keep connecting
cords as short as possible.)
Æ
Furniture materials can improve tone.
Carpet
Absorbs sound and vibrations
(Placing in front of speakers is also effective.)
Listening position slightly to the rear of the apex of an equilateral triangle formed with left and right speakers.
e Do not place equipment in locations that are unlevel or subject to vibration.
e Allow for good rear panel ventilation of components; avoid humidity and dust.
e Keep equipment away from radiators or other heat sources.
no
SX-950 FEATURES
LATEST TECHNOLOGY FRONT END
Two dual gate MOS FETs (field effect transistors), RF
amplification and a buffer amplifier between the local
oscillator and mixer stages exemplify the advanced tech-
nology built into the FM front end. Together with carefully
selected circuit components, this provides outstanding per-
formance in terms of sensitivity, overload resistance, image
rejection and spurious rejection. In all of its specifications,
the SX-950 FM tuner section compares favorably with the
most respected separate component type tuners.
HIGH SELECTIVITY IF STAGES
Excellent capture ratio, stable operation and sharp selec-
tivity are assured by three ceramic filters in the IF stages
and IC limiters. The filters never need realignment and
contribute to high reliability against aging and ambient
temperature variations.
QUADRATURE DETECTOR AND PLL
MPX DEMODULATOR
A balanced bridge differential amplifier performs quad-
rature detection of the FM signal. Linearity is assured
throughout the frequency band, while distortion becomes
minimized. Clear and stable separation is provided by the
PLL (phase locked loop) multiplex circuit design.
REDUCED DISTORTION AM CIRCUIT
Careful engineering is also evident in the AM tuner circuit.
Automatic gain control in the RF and IF stages, together
with a 3-gang variable capacitor and IC circuitry deliver
improved image ratio, selectivity and frequency response,
plus reduced distortion.
HEAVY DUTY SPLIT POWER SUPPLY
The dual positive and negative power supply incorporates
extra large 22,000 uF electrolytic capacitors and possesses
plenty of reserve power. Protection and muting functions
are included to both safeguard equipment and eliminate
power on-off noise.
PRECISION RIAA PHONO EQUALIZER
Deviation from the RIAA standard is performed within
+0.3dB, while the ability of the phono inputs to accept
relatively strong signal levels without distortion (200
mV rms) results in a wide dynamic range.
HIGH RELIABILITY PROTECTION CIRCUIT
In the event of malfunction, valuable semiconductors and
speakers are protected by a relay electronic protection
circuit that detects DC output voltage or impedance over-
load. This circuit also functions to reduce noise during
ON-OFF operation of the power supply.
EEE CER RIE SE EEE CEC AS RU BRS ERIE | CC TN To
VERSATILE TONE CONTROLS PLUS TURN-
OVER SELECTORS
Active NFB type bass and treble control circuits provide
precise and stable control without affecting the mid-range.
Turnover frequency selector switches determine the points
at which the tone controls take effect, and a convenient
tone on-off switch is also employed to allow a flat
frequency response to be obtained at any time regardless
of tone control and turnover switch settings. This is useful
for checking the effects of the phono cartridge, speakers,
listening room acoustics, etc. on the spaciousness of the
sound.
DIRECT COUPLED POWER AMPLIFIER
The power amplifier of the SX-950, is a direct-coupled,
pure complementary parrallel push pull circuit, which uses
a differential amplifier at first stage. SX-950 delivers
Continuous power output of 85watts™ per chan-
nel, min., at 8ohms from 20Hertz to 20,000
Hertz with no more than 0.1% total harmonic
distortion.
Plently of power is available for rich and stable stereo
reproduction.
IMPORTANT ADDITIONAL FEATURES
Two tape monitor circuits allow two stereo tape decks to
be used for recording, playback and tape duplication.
Microphone input on the front panel adds to versatility
and enjoyment.
The audio muting switch can be used to temporarily reduce
the volume by 20dB when changing records or tapes or for
other reasons, without continually adjusting the volume
control.
Indicator lamps provide clear indication of operating mode.
TASTEFUL STYLING COMPLEMENTS HIGH
PERFORMANCE
The exquisitely designed aluminum front panel is trimmed
with solid walnut. Control functions and layout also add
to both versatility and top grade components appearance.
In comvination with high quality source components and
speaker systems, a magnificent stereophonic music system
is composed for providing rich audio enjoyment.
* Measured pursant to Federal Trade Commission's Trade
Regulation rule on Power Output Claims for Amplifiers.
3
PIONEER
CONNECTION DIAGRAM
TURNTABLE
TAPE DECK
(open-reel, cassette)
TURNTABLE
TAPE DECK
(Open-reel, cassette) Y NR ADAPTOR
CU Re 4 CHANNEL DISCRETE
«ао ©
2 De
CARTRIDGE
TAPE PLAYER
OUTDOOR - es DE > | )
FM ANTENNA Ус = | —— | |
La | |
qq LINE | | LINE a | ME
INPUT | | OUTPUT INPUT OUTPUT L
INPUT OUTPUT
750 i
coaxial
cable
e i - ile | In
\! + y FM DE-EMPHASIS SWITCH
4 | | Normally, set this switch to “75us”. Be sure to set it to
) M “25us” only when listening to an FM broadcast (pre-
' || |" emphasis; 25usec.) with a Dolby* system NR adaptor con-
| ) nected between the ADAPTOR OUT and ADAPTOR IN
| \ terminals,
T-TYPE |
FM ANTENNA y |
| ;
L fv
ie ) E A —— = ty |
30012 feeder i | " | | ar abel 200 04 "Eo LA -
Ham | Her |
Ur | re - |
| "” amd ons A Fam |
| Г iy) q © © Ne - 1 |
a ' «1 |
ı ih ] I
| | ) —
E La al I
Su PRE/POWER AMP
AM ANTENNA E | - The bridge connecting plugs between PRE OUT and
(Indoor or Outdoor) e DDT POWER IN jacks should always be left in position in
> | normal use. If they are disconnected or removed, no T I' CONVENIENCE OUTLETS
me sound will come from the speakers. Always be sure to Unswitched: Less frequently used components, which do
pe switch off the power supply before attempting to (200W max.) not require coupled power, can be plugged
GND remove them. into either of these outlets.
For the applications of the Sk OUT pe POWER IN Switched: A frequently used component (turntable, tape
jacks, please refer to the section on “EMPLOYING (100W max.) deck, etc.) can be plugged into this outlet.
PRE OUT AND POWER IN JACKS" on page 16. By leaving the power switch of that compo-
nent in the ON position, power supply to the
component will be coupled with the SX-950
| «A switch operation.
| al
TAR TT
— - =
Lt
— » a ‘Зв, со Bb
LEFT RIGHT LEFT
SPEAKER SYSTEMS B SPEAKER SYSTEMS C
* The word “Dolby” is a trademark of Dolby Laboratories Inc.
RIGHT LEFT RIGHT
SPEAKER SYSTEMS A
aq 5
CONNECTIONS
SPEAKER SYSTEM CONNECTION
The receiver is equipped with three sets of speaker
terminals (A, B, and C). Use the A terminals for
the speakers in normal use.
As shown in Fig. 1, the upper socket (red) is the
positive (+) terminal, and the lower (black) is the
negative (—) terminal in each case.
In the same way, the speakers have positive and
negative polarity (+ and — terminals). Be sure to
connect terminals of the same polarity together
(+ to +, and - to —).
NOTE:
When two sets of speaker systems are being used at the
same time (A + B, A + C, or B + C), please ensure that
the impedance of each speaker system is not less than
82. If speaker systems with impedances below 8% are
used, the receiver's protection circuit may operate to
prevent sound being produced.
SPEAKER OUTPUT TERMINALS
LEFT CHANNEL
(| ©
RIGHT SPEAKER
SYSTEM
LEFT SPEAKER
SYSTEM
Fig. 1
Speaker Lead Wire Preparation & Connection (Fig. 2)
1. Strip about 10mm (3/8 inch) of the insulation
from the end of the speaker lead wire.
2. If the conductor is stranded, twist the strands
together so they do not come loose.
3. Depress the black colored lever of the speaker
terminal and insert the speaker minus lead wire
into the hole above the lever. Return the lever
to its former position.
4. Push up the red colored lever of the speaker
terminal and insert the speaker plus lead wire
into the hole below the lever. Return the lever
to its former position.
Speaker lead-wire
=--1 Om m =
Remove insulation
from wire end.
Twist stranded wire.
lever
lever
e Speaker lead -wires Fig. 2
TURNTABLE CONNECTIONS
The receiver is fitted with two sets of input jacks,
PHONO 1 and PHONO 2, enabling two turntables
fitted with magnetic phono cartridges to be con-
nected.
e Connections between the turntable OUTPUT
terminals and the receiver PHONO input jacks
should be made as shown in Fig. 3, taking care
not to confuse LL & R channels. If, as in Fig. 3,
the turntable is fitted with a ground lead or plug,
this should be connected to the receiver GND
terminal.
NOTES:
I. When using a turntable fitted with two tonearms, the
output leads for each of the tonearms should be con-
nected to the respective PHONO input jacks (1 and 2).
. When using a turntable fitted with a moving coil (MC)
phono cartridge, it is essential to use a special MC
matching transformer or head amplifier.
re
TURNTABLE
GROUND WIRE
CARTRIDGE
TAPE PLAYER
USE OF THE AUX INPUT JACKS
These are a set of spare input jacks, which can be
connected to a cartridge tape player, television
sound tuner, or other signal source. The upper of
the two jacks is the L (left) channel, and the lower
is the R (right) channel (Fig. 3).
ER NAAR A Ne SE Val VR TSI Yi ARELLANO ALZIRA [OT
ANTENNA AND GROUND CONNECTIONS
FM ANTENNA CONNECTIONS
For the best results you should use an outdoor-
type FM antenna, although the simple T-type
antenna supplied with the receiver may be used
satisfactorily in areas of high signal strength (for
instance, those very near to the FM station, or in
a house of all-wooden construction).
FM Outdoor Antenna
Normally, install antenna as follows.
e Connect antenna feeder wire to the 3002
antenna terminals of the SX-950 as shown in
Fig. 4.
e While listening to broadcasts, as described on
page 10, install the antenna and determine the
best location for optimum reception. Secure
antenna firmly.
Station ui i
Outdoor AM antenna
Outdoor FM antenna
(special antenna)
as
3002 FM
Ground feeder terminals
AM terminal |
> Fig. 4
NOTE:
Urban areas with heavy traffic, industrial zones, or loca-
tions near high voltage power lines may experience
interference even with a special FM antenna. In such cases
seek the advice of an audio dealer. It may be advisable
to employ 755) coaxial cable to connect the antenna to
the SX-950 759 UNBAL terminal.
A 8, с
Соге (+) A
Braid (-) DN
AR
5
750 FM
coaxial cable
terminal
Strip the coaxial cable as shown in (A)
Loosen the screws and insert the cable (B)
Tighten all screws for a firm connection (C)
Fig. 5
T-type Antenna
The accompanying T-type antenna can be used
where FM signals are strong. Connect it to the
antenna terminals as shown in Fig. 6. While
listening to an FM station, spread the two arms
horizontally and determine its best orientation.
Secure it to a wall or ceiling. See FM Reception
on page 10.
Indoor AM antenna Station direction
vinyl i | |
/ у insulated wire =~ <
| >> FM | Fasten
|| | | antenna with tacks
Do not bundie.
Fig. 6
AM ANTENNA
Normally, position the ferrite bar antenna (Fig. 7)
for best reception while listening to an AM station
as described on page 10.
AM Indoor Antenna
If reception is difficult with the bar antenna, an
indoor AM antenna can be erected with vinyl
insulated wire as shown in Fig. 6.
AM Outdoor Antenna
For optimum AM reception, an outdoor AM
antenna using vinyl insulated wire can be erected
as shown in Fig. 4.
AM ferrite bar antenna
Fig. 7
GROUND
For maximum safety and to eliminate noise, con-
nect the GND terminal to an earth ground if at
all possible. See Fig. 4.
FRONT PANEL FACILITIES
SPEAKER BUTTONS
Three sets of speaker terminals, A, B, and C, are provided
on the rear panel, and the required speaker systems can
be selected by depressing the SPEAKERS buttons as
follows:
A memes à = ahs Speaker systems A operate
Васе с сосной Speaker systems B operate
Cs e E Speaker systems C operate
NOTES:
I. When any two buttons (A+B, B+C, C+A) are depressed
simultaneously, the corresponding pairs of speaker
systems will come into operation. However, it is not
possible to operate all three speaker systems at the
same time, even though all the buttons are depressed.
2. For private listening through headphones, return all
ts
FM TUNING METER
With the SIGNAL meter needle deflected to the right,
make fine adjustment by centering the FM TUNING
meter needle (indicating optimum reception).
SIGNAL METER
For AM and FM station tuning.
AM tuning: Tune for maximum deflection of the
SIGNAL meter needle to the right.
FM tuning: Both the SIGNAL and FM TUNING meters
work together. (see FM TUNING METER)
SPEAKER SYSTEM INDICATOR
FM STEREO INDICATOR
TUNING KNOB
Select the station and tune for optimum reception by
observing the SIGNAL meter for AM stations, and both
SIGNAL and TUNING meters for FM stations.
PROGRAM SOURCE INDICATOR
PIONCER
——FUNCTION SELECTOR BUTTONS
To select the program source, push the buttons as follows:
Ace = = se à 5% For AM broadcast reception.
ЕМ css sss For FM broadcast reception. The STE-
REO indicator lights up when the broad-
cast is in sterco.
PHONO 1... . To operate a turntable connected to the
PHONO 1 input jacks.
PHONO 2/MIC . As above for PHONO 2 jacks, or for
reproduction through a microphone con-
nected to the MIC jack on the front panel.
Note: when the microphone is plugged in
the turntable connected to the PHONO 2
jacks cannot be used.
the SPEAKERS buttons to the OFF (undepressed) -- TT AUX ....... For listening to an audio component (car-
position. | | @ Monee | ~ \ tridge tape player, TV sound tuner, etc.)
| В | j - +4 - — || connected to the AUX input jacks.
PHONES OUTPUT JACK E i= ada | va a = |
) i | — >= UT = con co ста ) IL NOTE: Only one FUNCTION button should be de-
Accepts stereo headphones. ME —— =— \ Dressed: ata tins
| 28, 8,8 8,8, 8 | 00, 82, 18, 18, | à | |
POWER SWITCH | Ty ue EE EE ENV Ш == VIC JACK
After turning this switch ON there is a delay of some 3 li — = Sy FT IT >= o Accepts a standard 6 émm microphone plug.
to 6 seconds, during which time the protection circuit i S > о ё & $ & à e | UDIO MUTI |
operates to eliminate unpleasant noise. | Ц = | | | А O MUTING SWITCH -20dB 088
AN! | Fe says er nl LS te == ий |] Set to —20dB to attenuate the audio output by :
BASS CONTROL ; Ц @ 4) В A ) RUN < | This convenient feature saves having to disturb the
Clockwise rotation gives stronger emphasis to the bass 7\ | © № | У © o © CEE. с Se = ® 7 v A || VOLUME control, for example when answering the
range below the turnover frequency (which is selected by В : - -- =. | | telephone.
the BASS TURNOVER switch), while counterclockwise PT IN
rotation reduces bass response.
BASS TURNOVER SWITCH
This selects the frequency below which the bass tone con-
trol will begin to act. This “turnover” frequency can be
set at 400Hz or 200Hz, to match the characteristics of
the room, the program material, or your personal listening
preferences.
TONE SWITCH
In the OFF (up) position, this switch causes the ampli-
fier section to operate with a flat frequency response
regardless of the tone control setting.
TREBLE TURNOVER SWITCH———w——————»
This switch selects the frequency above which the treble
tone control will begin to act. This “turnover” frequency
can be set at 2.5kHz or 5kHz, to match the characteristics
of the room, the program material, or your personal
listening preferences.
TREBLE CONTROL
Clockwise rotation gives stronger emphasis to the high
range above the turnover frequency (selected by the
TREBLE TURNOVER switch), while counterclockwise
rotation reduces high-range response.
LOW CUT FILTER SWITCH
When low-pitched rumble (from turntable motor or other
source) is obstrusive, set this switch to the 30Hz position
to provide 6dB/octave attenuation at frequencies below
30Hz. If no interference is experienced, set in the up
position.
HIGH CUT FILTER SWITCH
When high frequency scratch noise (from worn records
or other source) is unpleasant, set this switch to the 6kHz
position to provide 6dB/octave attenuation at frequencies
above 6kHz. If there i$ no interference, set in the up
position.
MPX NOISE FILTER BUTTON
Comparatively high frequency noise, incurred when re-
ceiving weak FM stereo signals, can be eliminated by
depressing this button to ON. In this case however, there
will be some loss of stereo separation.
TAPE MONITOR (1,2) SWITCHES
ariel With a tape deck connected to the TAPE 1
jacks (REC and PLAY), either playback or
monitoring of a recording In progress are pos-
sible.
aaa Same as in 1 above, with a tape deck connected
to the TAPE 2 jacks (REC and PLAY).
—TAPE DUPLICATE SWITCH
Set this switch in the ON (down) position to duplicate
or edit a recorded tape using two tape decks.
—FM MUTING BUTTON
Leave this button undepressed (in the ON position) to
suppress unpleasant interstation noise while tuning be-
tween stations. Low-strength signals may also be sup-
pressed by this function, so to pick up a weak station
depress this button to the OFF position.
— VOLUME CONTROL
Governs the level of sound outputs both from the speaker
systems and from headphones.
LOUDNESS SWITCH
Set to ON when listening at low volume. The frequency
response of the human ear varies according to the listening
volume, and the ON position compensates for hearing
response by emphasizing the bass and treble.
Lobe SWITCH
Set to STEREO for normal stereo operation. When set to
MONO, left and right channel signals will be mixed and
reproduced monophonically from both speaker systems.
—— BALANCE CONTROL
Adjusts the balance between the sound volume from the
left and right speaker systems or headphones.
-————ADAPTOR SWITCH
When employing adaptor components, such as a graphic
equalizer adaptor, RG processor, or Dolby NR adaptor,
depress this ADAPTOR switch to ON.
HOW TO OPERATE THE RECEIVER
PRIOR TO SWITCHING POWER ON
Before switching on the power, set the various con-
trols as follows:
Turn the MUTING switch OFF (up)
Set the TREBLE and BASS controls to the midway Set the VOLUME control to MIN
positions (the “0” positions) (fully counterclockwise)
Turn the TAPE MONITOR and ADAPTOR - Turn the MODE switch to
switches to OFF (up) STEREO (up)
Set the BALANCE control to the midway position
FM RECEPTION AM RECEPTION
1. Depress the FM selector button. 1. Depress the AM selector button.
2. Set the FM MUTING OFF button to ON(un- 2. Turn the TUNING knob to select your station.
depressed). Note, however, that in areas of low Best reception is obtained when the SIGNAL
signal strength the signal may be suppressed. meter needle deflects to the extreme right (Fig. 9).
In this case only, the FM MUTING OFF should 3. Adjust the VOLUME, BASS and TREBLE con-
be depressed. trols for the listening level and tone quality of
3. Select the station by means of the TUNING your preference.
knob. NOTE:
Best reception 1s obtained when the SIGNAL If, when listening to either FM or AM broadcasts, listening
meter needle deflects to the extreme right, and pleasure is seriously affected by poor sensitivity or strong
the TUNING meter needle is exactly in the interference, refer to the section “ANTENNA AND
center, as shown in Fig. 8. If the broadcast is GROUND CONNECTIONS," on page 7 and make any
stereophonic, the STEREO indicator lamp will necessary changes.
come on; it will not illuminate for monophonic
broadcasts. == a ; - ——— a
4. Adjust the sound level by means of the VOL- EE Md:
UME control, and use the BASS and TREBLE | = В т
controls to give the required tone quality.
FM Reception Fig. 8
— г — |
vy ye
= — — 5
SIGNAL TUN NG seb)
AM Reception ER Fig. 9
10
RECORD PLAYING
1. Set the FUNCTION selector to either PHONO 1
or PHONO 2/MIC, depending upon which input
jacks the turntable is connected to.
2. Operate the turntable to play the record.
3. Adjust the VOLUME, BASS, and TREBLE con-
trols for the listening level and tone quality of
your preference.
NOTE:
In order to eliminate the unpleasant noise which can mark
the start of a record, set the AUDIO MUTING switch to
—20dB, releasing it after the stylus has completed the
run-in, and then adjust the VOLUME to give the sound
level of your choice.
USING THE AUX JACKS
To play equipment connected to the AUX jacks,
proceed as follows:
1. Set the FUNCTION selector by depressing the
AUX button.
2. Operate the attached component.
3. Adjust the VOLUME, BASS, and TREBLE con-
trols for the listening level and tone quality of
your preference.
MICROPHONE
1. Connect the microphone to the MIC jack.
2. Set the FUNCTION selector by depressing the
PHONO 2/MIC button.
3. Adjust the sound level by turning the VOLUME
control gradually to the right. The midway set-
ting of the BASS and TREBLE controls will
usually give best results.
PROTECTION CIRCUIT
For some 3 to 6 seconds after the receiver is
switched ON, no sound will be heard. This is due
to the operation of protection circuits which are
designed to safeguard transistors and speakers
from possible damage, due chiefly to switching
transients, etc. Should the receiver remain silent
for considerably longer than this, switch off and
check the speaker system connections. Should the
receiver suddenly go silent while you are listening
to it, and a continuous series of “clicks” can be
heard due to relay contacts opening and closing
within the receiver, this can be an indication of a
short circuit in the speaker system connections.
Switch off, and re-check the speaker system imped-
ances, etc.
The protection circuit re-sets itself automatically,
so that normal operation is resumed as soon as the
fault is cured.
NOTE:
Under certain conditions the microphone is liable to give
rise to “howling” or feedback noise. Be careful not to
raise the volume too high when the microphone is close
to the speaker systems or in a room with a great deal of
resonance. This tendency can be reduced by setting the
TREBLE and BASS controls to their “0” positions, or by
switching the TONE switch OFF (up).
TURNOVER SWITCHES
The SX-950 provides two special bass and treble
turnover frequency selector switches. Each switch
and two numbers, the BASS 400 and 200Hz, the
TREBLE 2.5k and 5k, which show the frequencies
at which the BASS and TREBLE controls begin
to act.
Fig. 10 shows the response curves indicating the
relation between the TURNOVER switches and the
TREBLE controls.
These are a very convenient way of adjusting the
tone quality to suit the characteristics of the room,
the program source, the cartridge characteristics
or your personal taste, etc.
Level (dB)
A + * + * -
i xs = + + + — — * * + —4—4 +
LT LL
" i ] la in a
Frequency (Hz)
TAPE DECK OPERATION
TAPE DECK CONNECTIONS
Two sets of recording output jacks (TAPE 1, 2
REC) and two sets of playback input jacks (TAPE
1, 2 PLAY) are provided, plus a DIN-type
recording/playback connector (TAPE 2 REC/
PLAY).
This means that in addition to normal recording
and playback, two decks can be used to record at
the same time, or to “dub” or duplicate recordings
from one tape deck to the other.
Use the connecting cord(s) provided with the tape
deck(s) to make the connections (see Fig. 11).
A tape deck can also be connected to the ADAP-
TOR jacks.
Connections for Recording
® The receiver output TAPE 1 REC jacks are
connected to the recording input jacks (LINE
INPUT) of the tape deck as shown in Fig. 11.
The upper jack of each pair is the L (left)
channel and the lower is the R (right) channel.
When the tape deck is provided with a DIN-type
connector for recording and playback, use an
optional recording/playback cord (Fig. 12).
NOTE:
As the recording/playback cord connects both recording
and playback functions at the same time, there is no need
to make separate connections to either TAPE 2 REC out-
put jacks or TAPE 2 PLAY input jacks. If the ADAPTOR
OUT jacks are to be used, connect them to the tape deck
input (LINE INPUT) jacks.
e When using two tape decks, the second tape deck
should be connected to the receiver TAPE 2
REC output jacks. If, however, the first deck
has been connected to the DIN-type recording/
playback connector, the second deck should be
connected to the TAPE 1 REC output jacks.
TAPE DECK
Tape deck Playback
connecting
jacks Left
channel
TAPE DECK CONNECTION Fig. 11
12
connections
Connections for Playback
e Connect the receiver TAPE 1 PLAY input jacks
to the playback output jacks (LINE OUTPUT or
TAPE MONITOR) on the tape deck. The upper
jack of each pair is the L (left) channel, and the
lower is the R (right) channel.
NOTE:
If the ADAPTOR IN jacks are to be used, connect them
to the tape deck output (LINE OUTPUT) jacks.
e When using two tape decks, the second tape
deck should be connected to the receiver TAPE
2 PLAY input jacks. If, however, the first deck
has been connected to the DIN-type recording/
playback connector (TAPE 2 REC/PLAY), the
second deck should be connected to the TAPE 1
PLAY input jacks.
SX-950
These jacks should
connected when the DIN-
type connector is employed.
TAPE DECK Recording and
DIN type connector playback cord
Fig. 1
OPERATIONS pa
Playback
1. According to the TAPE PLAY (1, 2) or ADAP-
TOR IN jacks to which the tape deck is con-
nected, either the TAPE MONITOR 1 or 2
switches or the ADAPTOR switches should be
set to ON (see Figs. 13 and 14).
. Operate the tape deck controls for playback.
. Adjust the VOLUME, BASS, and TREBLE con-
trols for the listening level and tone quality of
your preference.
Lo N
NOTE:
Setting the TAPE MONITOR switch to ON enables tape
playback whatever the setting of the FUNCTION selector.
F— TAPE- q
DUPLICATE MONITOR ADAPTOR
999 .…
TAPE DECK 1 TAPE DECK 2 TAPE DECK 3
~~ — = ~~
а Sra NE + nr e % a ú
e AY TAY
Le
Г ON ь ON ON
ый Signa
E OFF OFF OFF
TAPE MONITOR TAPE MONITOR ADAPTOR
SWITCH 1 SWITCH 2 SWITCH
ON OFF OFF
Fig. 14
Recording
As shown in Fig. 15, the receiver TAPE REC
(1, 2) and ADAPTOR OUT jacks carry a certain
fixed level output from the source selected by the
FUNCTION selector , which once the tape deck is
connected to the appropriate jacks, enables the
selected source to be recorded.
The operation is as follows:
1.Set the FUNCTION selector button for the
source to be recorded.
2. Play the selected program source.
3. Adjust the recording level by means of the
controls on the tape deck and commence
recording.
NOTE:
The receiver VOLUME, BASS, and TREBLE controls are
completely inoperative — that is they have no affect on
the recorded sound — when recordings are being made.
TAPE DECK 1 TAPE DECK 2 TAPE DECK 3
Sone % A я
ЙА TAR
da a
SE |
REC
DUPLICATE SWITCH
hs + OFF Ÿ
ON © Lon Signa
— oy e ———
OFF ‘OFF - OFF
TAPE MONITOR TAPE MONITOR ADAPTOR
SWITCH 1 SWITCH 2 SWITCH
OFF OFF UFF
Fig. 15
Tape Monitoring
While a recording is being made on a three-head
deck or one equipped with a monitoring facility,
the recorded sound can be monitored through the
speaker systems if the TAPE MONITOR switch is
turned ON.
In this case both recording and playback connec-
tions must be made.
TAPE DECK 1 TAPE DECK 2 TAPE DECK 3
— -
“oor ye % A > % a “» >
i к
Na A “C
iin Ee
E e |
- 3 Ly tee ||
: #4 @
SE
——e——q > es — ро
TAPE MONITOR TAPE MONITOR ADAPTOR
SWITCH 1 SWITCH 2 SWITCH
ON o OFF ¿
ON o OFF OFF
Fig. 16
Duplicating or Editing Recorded Tapes
By using two tape decks, a recording of, say, a
complete FM broadcast can be made, and then
those items which you want for your permanent
“tape library” can be selected and re-recorded onto
another tape.
1. Connect the two tape decks as shown in Fig. 16.
2. Set the TAPE DUPLICATE switch to the ON
position.
3. Select one of the tape decks (1 or 2) to play-
back the pre-recorded tape, and use the other
tape deck to make the copy recording.
4. When recording with tape deck 1, TAPE MONI-
TOR switch 1 should be switched ON to moni-
tor the sound being recorded, and when record-
ing with deck 2, TAPE MONITOR switch 2
should be switched ON for monitoring (refer
again to Fig. 16).
13
ADAPTOR JACKS FOR INCREASED VERSATILITY
TAPE DECK
USE OF DOLBY ADAPTOR
If a Dolby adaptor is connected to the receiver
ADAPTOR jacks, not only can FM Dolby broad-
casts be played back, but if a tape deck is con-
nected to the adaptor itself, Dolby system record-
ing and playback are available.
RECEPTION OF FM DOLBY BROADCASTS
Dolby system FM broadcasts can be received by
making the following connections:
1. Set the DE-EMPHASIS switch to “25us” posi-
tion.
2. Connect the Dolby adaptor as shown in Fig. 17.
to the ADAPTOR IN and OUT jacks.
3. Set the FUNCTION selector to FM by depressing
the FM button, and tune in to an FM Dolby
system broadcast.
4. Turn the ADAPTOR switch ON.
DOLBY NR ADAPTOR
3
OFF
ADAPTOR
SWITCH ON
es — = —— + — - Рю. 17
Dolby Recording
1. As shown in Fig. 18, connect the Dolby adaptor
output jacks to the tape deck recording input
jacks (LINE INPUT).
2. Select the program source of your choice with
the FUNCTION selector.
NOTE:
If you wish to monitor the sound being recorded with
the Dolby adaptor, turn the ADAPTOR switch ON.
Dolby Playback
1. Connect the tape deck playback output jacks
(LINE OUTPUT) to the input jacks of the
Dolby adaptor.
2. Turn the ADAPTOR switch ON, and playback
your Dolby system recordings.
NOTE:
For detailed instructions on connections, etc., please see
the instruction manual provided with your Dolby adaptor.
14
OFF
ADAPTOR
SWITCH ON
> Fig. 18
OTHER ADAPTORS CURRENTLY AVAILABLE
The provision of these convenient adaptor jacks
in addition to the normal tape REC/PLAY jacks,
enables other sophisticated adaptor units (e.g. a
graphic equalizer, RG dynamic processor, etc.) to
be connected without forfeiting the full tape
monitoring and duplicating facility. When using an
adaptor, the program source can be taken from
the function selector or the tape deck output
terminals. Fig. 19 illustrates an RG dynamic
processor connected to the ADAPTOR terminals.
ADAPTOR
(e.g. RG proccessor)
1
re
(С)
OF F OF F OFF
TAPE MONITOR TAPE MONITOR ADAPTOR
SWITCH 1 SWITCH 2 SWITCH
OFF _ OFF : ON
Fig. 19
SETTING UP A 4-CHANNEL SYSTEM
As shown in Fig. 20, a 4-channel system consists
of two pairs of speakers, one at the front and the
other at the rear, which gives a whole new dimen-
sion of realism not attainable with conventional
2-channel stereo. It gives a truer impression of the
acoustics of the hall where the recording was
made, including the atmosphere and applause.
The unique sense of “presence” of being “actually
there” which 4-channel stereo alone can give, has
to be experienced before it can be appreciated,
and this receiver is ideally suited to form the heart
of a 4-channel system, when connected to four
speaker systems and a 4-channel decoder/power
amplifier (“decoder-amp” below) for the rear
channels.
4 CHANNEL
DECODER AMP
REAR
SPEAKERS
LEFT
—((| RIGHT
ADAPTOR
OUT
L
FRONT SPEAKERS
Er que
i
SIGNAL RIGHT
ADAPTOR SWITCH
SX-950
Fig. 20
Operation
1. Connect the receiver ADAPTOR OUT jacks to
the decoder-amp INPUT jacks.
2. Connect the receiver ADAPTOR IN jacks to the
decoder-amp OUTPUT jacks.
3. Turn the ADAPTOR switch ON.
4. Switch on the auxiliary adaptor unit.
5. You are now ready to enjoy the thrill of
4-channel reproduction.
Placement of Your Speaker Systems
As shown in Fig. 22, two pairs of speaker systems
are located at the front left and right, and the rear
left and right (four in all). Connect the speakers
located in FRONT to the receiver, and the REAR
speakers to the power amplifier for the rear chan-
nels.
4 CHANNEL RÁN
DISCRETE FM A
BROADCAST ADAPTOR REAR AMP SPEAKERS
4 CH OUTPUT IN
INPUT
LEFT
IN
RIGHT
ADAPTOR
IN
FM
(4 L) FRONT
SPEAKER
4-CHANNEL
DISCRETE FM
BROADCAST
LEFT
= = = = = À
TO FUNCTION RIGHT
ADAPTOR SWITCH
SX-950 Fig. 21
Receiving 4 channel FM broadcasts
If 4-channel multiplex discrete FM broadcasts are
available, the addition of a 4-channel discrete FM
broadcast adaptor (“adaptor” below) will enable
full 4-channel reproduction of the broadcasts from
your receiver.
1. The adaptor is connected to the FM DET. OUT
jack of the receiver as shown in Fig. 21.
2. Connect the adaptor output to the receiver
ADAPTOR IN jacks.
. Turn the ADAPTOR switch ON.
. Depress the FM button for FUNCTION selection.
. Tune in to the 4-channel discrete FM broadcast.
. Switch on the auxiliary adaptor unit.
. Adjust the VOLUME, BASS, and TREBLE con-
trols for the listening level and tone quality of
your preference.
-1 ©) N Se
NOTE:
For detailed instructions on connections, etc., see the
instruction manual supplied with the adaptor.
1
FRONT LEFT FRONT RIGHT
o
REAR LEFT REAR RIGHT
>= OS
Fig. 22
15
EMPLOYING PRE OUT AND POWER IN JACKS
USING THE PRE OUT AND POWER IN JACKS
If the connections between the PRE OUT and
POWER IN jacks shown in Fig. 23 are removed, the
power amplifier and pre-amplifier section, it is
possible to use it to drive a separate, high output
power amplifier, or to build up a multi-amplifier
system.
INDEPENDENT PREAMPLIFIER FUNCTION
The preamplifier section of the SX-950 can be used
independently to drive an external power amplifier.
This allows comparision listening between the
built-in SX-950 power amplifier and a homebuilt
or other separate power amplifier.
Power Amplifier
MP
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pe 1 pr FA
(PA ||
| CA UD
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Na Fig. 23
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si Left Channel Speaker
CONNECTIONS FOR SETTING UP A MULTI-
AMPLIFIER SYSTEM
By purchasing an electronic crossover network and
one or two additional power amplifiers, a two- or
three-way multi-amplifier system can be con-
structed. This splits up the audible frequency range
into different frequency bands, to operate ampli-
fiers and speakers ideally suited to each band.
The result are reduced intermodulation distortion
and improved damping and crossover characteris-
tics. Use of the multi-amplifier system is as
follows:
1. Remove both of the plugs bridging the PRE
OUT and POWER IN jacks.
2. Connect the PRE OUT jacks to the input jacks
of the crossover network.
Example of a 2-way Multiamplifier System SX-950
Right Channel Speaker
Fig. 24
3. Connect the POWER IN jacks to the LOW range
jacks of the crossover network.
4. Connect the HIGH range output jacks of the
crossover network to the input jacks of a
separate power amplifier for the high frequency
range.
5. Connect the speakers for the lower frequencies
to the receiver, and those for the higher fre-
quencies to the separate amplifier.
The levels of the different frequency ranges are
adjustable by the crossover network. For detailed
instructions on the use of the crossover network,
please refer to the instruction manual provided
with it.
Speakers
High Frequency
|
Low frequency
Power Amplifier
High Frequency
As
00990000
TCO
BE
A:
O Low Frequency
Crossover Nero
(such as PIONEER SF-850)
16
Fig. 25
HIGH RANGE
=! 22 CN DON то
CONDITIONS FREQUENTLY MISTAKEN FOR MALFUNCTION
If your stereo appears to malfunction, first check such things as the fuse, controls (power switch, function
selector, tape monitor, etc.) and connecting cords (components connected correctly).
Noise: There are a variety of noises relating to the
operation of a hi-fi unit. These are generally
divided into two types; (1) the unit is faulty (a
transistor or part has deteriorated) and (2) an
external source is adding to the unit.
When a hi-fi unit produces an unpleasant noise, it is
often assumed that the unit is faulty, but statistical
records indicate that the majority of noises pro-
duced in hi-fi acoustic units result from external
sources of noise: Due to the inherent high sensi-
tivity and the high fidelity in reproduction, the
unit amplifies and reproduces extraneous noises,
however small, into definite output noise. If your
receiver produces a noise, check according to the
following table and trace out the source of noise
for the appropriate corrective action.
tuned in (10kHz beat interference).
WHEN LISTENING TO BROADCASTS
SYMPTOM SUSPECTED SOURCE OF NOISE DIAGNOSIS AND REMEDY
Continuous or intermittent + Static (lightning) In many cases, it is very difficult to remove the source
noise like jjjijj Or 222222. + Fluorescent lamp, motor, or thermostat | of noise. In order to make the radio input larger than
may be in use in house or in the vicinity of | the noise level, set up a good outdoor antenna and
the house. make a complete grounding.
When a station 1s tuned in, + Poor fluorescent lamp, motor, or electric Reversing the line plug may occasionally alleviate this
hum 15 mixed in the pro- heater may be in use in house or near the noise problem. Usually (1 is very difficult to eliminate
gram. house. the noise.
| — — ae =
Hissing sound noise in AM * The frequency of an adjacent station is | Impossible to remove such interference. If the cause of
(medium wave) reception. interfering with that of the station being | such noise is the TV set, increase the distance between
* TV set 15 on in the same house with the
the TV set and receiver.
receiver,
Static noise (in particular, * White noise generated from automobile | In an area surrounded by hills or high buildings, the
when automobiles run engines, FM input signals are very weak. Thus the noise limiter
close to the house). - High frequency sewing machine or weld- | in the circuit loses its function. Set up an FM outdoor
ing machine being used near your house. antenna having many director elements,
Reception of FM stereo | - Note that the service area covered by an | Increasing the FM input signal may alleviate this
program contains more FM stereo broadcast is about 50% of that | problem. Use an exclusive FM outdoor antenna instead
noise than FM mono pro- of a regular mono broadcast. of the indoor T-type antenna.
gram.
ww | Hum or buzz. When + Poor connection of shielded wire. (a) Correct the conditions stated in (a), (b), (c) or (d). In
Q | switched to radio recep- * Jack connection is loose. (b) case of (e), report it to an official activity.
5 tion, the noise disappears. * Line cord of fluorescent lamp is near the
O shielded wire. (c)
x - Poor grounding. (а)
O + Ham transmitting station or TV transmit-
2 ting station is near your house. (e)
x Output tone quality is | * Stylus is worn. (a) Check (a) through (e) and correct the condition.
3 | poor and mixed with noise. | * Record is worn. (b)
z | Treble is not clear. * Dust adhering to stylus. (c)
uw Stylus is improperly mounted. (d)
= Stylus pressure is not correct. (e)
The TREBLE level is too high. Lower the TREBLE level.
In playing a record, in- | - Distance between the turntable and the | Increase the distance or rearrange the installation
creasing the volume causes speakers is too short. of the unit and speakers. (Installing the turntable on a
howling. * The turntable or speakers supports are | firm, solid stand may alleviate this problem.)
unstable. Do not enhance the BASS sound level excessively.
о> Howling occurs “Feed back between microphone and | * Keep microphone away from speakers
zo speakers. + Do not set the VOLUME control too high.
Dr * Set BASS and TREBLE controls to center positions.
го
WE
zo
>>
17
SPECIFICATIONS
Semiconductors
PENS. chine sass 6 Sioarens y e als ccoo ue. 4
WES: . sss dams os senha cios e d e e elo ne 4
TERNSISCOFNS '<....... € 7 2 aa Aterele sas. ae... 55
DOUE - e... pa Sh fo e eo eee 00 36
Power Amplifier Section
Continuous power output of 85watts” per chan-
nel, min., at 8ohms or 110watts* per channel
at 4ohms from 20Hertz to 20,000Hertz with
no more than 0.1% total harmonic distortion.
Total Harmonic Distortion
(20 Hertz to 20,000 Hertz, from AUX)
Continuous Rated Power Output. . . No more than 0.1%
43 watts per channel power
output, Sohms . . coves ss No more than 0.05%
1 watt per channel power
output, 8ohms ........... No more than 0.05%
Intermodulation Distortion
(50 Hertz: 7,000Hertz=4:1, from AUX)
Continuous Rated Power Output. . . No more than 0.1%
43 watts per channel power
output, Bohms : = » € VE No more than 0.05%
| watt per channel power
output, 8 ohms ........... No more than 0.05%
Frequency Response ......... 7Hz to 90,000Hz *? dB
Input Sensitivity/Impedance
POWER AMP IN 2c > à € + menea. eee 1 V/50k ohms
Output
Speaker ............... A, B, C, A+B, B+C, A+C
Headphone... ................ Low Impedance
Damping Factor
(20Hz to.20.000Hz; 8 Ohms) =:=...=:==e 5 « > aan 25
Hum and Noise (IHF, short-circuited, A Network) . .100dB
Preamplifier Section
Input Sensitivity/Impedance
PHONO 1 .................. 2.5mV/50k ohms
РНОМО 2... ............... 2.5mV/50k ohms
MIC oneness à 7 aurons 6.5mV/50k ohms
AUN == == emule e a | eta 150mV/50k ohms
TAPE PEAYT ua su eee 150mV/50k ohms
TAPE PLAY Z oasis annie 150mV/50k ohms
TAPE PLAY 2 (DIN connector)... 150mV/50k ohms
PHONO Overload Level (T.H.D. 0.1%)
РНОМО 1... ................ 200mV (1kHz)
PHONO 2: eoznozans e à a à eno ere. 200mV (1kHz)
Output Level/Impedance
TAPE-REG Iso 5 a 5 eau 5 5 вов ее 150mV
TAPE REC 2 006s svi lea mes 150mV
18
TAPE REC 2 (DIN connector) 30mV/80k ohms
IRE OR e e a 1V/100 ohms
Total Harmonic Distortion
(20Hz to 20,000Hz 1V output). . . No more than 0.05%
Frequency Response
PHONO (RIAA equalization). .30Hz t015,000Hz +0.2dB
AUX, TAPE PLAY ....... 10Hz to 50,000Hz *?dB
Tone Control
DASS 2... esicioresosea +7dB/+10dB (100Hz)
Turnover Frequency 200Hz/400Hz
TREBLE : 2 acia sas... +7dB/+10dB (10kHz)
Turnover Frequency 5kHz/2.5kHz
Filter
LOW. caca sue us 30Hz (6dB/oct.)
HIGH 2512050 octets dt au a 5 6kHz (6dB/oct.)
Loudness Contour (Volume control set
at —40dB position). ... +6dB (100Hz), +3dB (10kHz)
Hum and Noise
(IHF, short-circuited, A Network, rated power)
PRHONO :2=::.c. 00. on ecae.. 0 000 75dB
AUX, TAPE PLAY .................... 90dB
Muting 220202000000 eee —20dB
FM Section
Usable Sensitivity .. MONO ........ 10.3dBf (1.8uV)
STEREO: ..::x 22.2 dBf (7.1uV)
50dB Quieting Sensitivity . . .
MONO ......... 17.2dBf (4uV)
STEREO ....... 38.0dBf (44uV)
Signal to Noise Ratio at 65dBf . MONO ........ 72dB
JIEREO +5... 67dB
Distortion at 65dBf 100Hz ...MONO......... 0.15%
STEREO ....... 0.3%
IKHiZz... .. MONO .. ... ... 0.15%
SIEREO. ..... 0.3%
6kHz ; - - - MONO ==... 0.4%
STEREO ::. ic. 0.4%
Frequency Response ....... 30HZ to 15,000Hz *2-3dB
Capture Ratio. . esse les a ¿le »Ietelaa © a à € ela 1.0dB
Alternate Channel Selectivity . . .............. 80dB
Spurious Response Ratio ................. 100dB
Image Response Ratio ........oeéwe.oorooooo 85dB
IF Response Ratio ......o.ceesweoroscereo 100dB
АМ Suppression Ratio .......r___<oereereceoo 55dB
Muting Threshold .................... 14dBf (2.8uV)
Stereo Separation ...40dB (1kHz), 30dB (30Hz ~ 15kHz)
Subcarrier Product Ratio! - - - « emienie > à à = ae 62dB
SCA REIGCNON Rallo: - -... > > : == seee: 62dB
Antennalnput ............... 300 ohms balanced
75 ohms unbalanced
A ARR EE EC (200 O
AM Section
Sensitivity (IHF, Ferrite antenna) .......... 300uV/m
(IHF, Ext. antenna) .............. 15uV
Selectivity 0...0.00000000000000 000000. 0.0.00 40dB
Signal to Noise Ratio .................... 55dB
image Response RatiO' . . - - . . +... ese 5 6 6 » e'erá 65dB
I Response Ratio .. - - 5 «5 stiles so 4s = sia 85dB
Antenna == e Built-in Ferrite Loopstick Antenna
Miscellaneous
Power Requirements ........e.éoeoo0roeo. 120V 60Hz
Power Consumption. ............ 370w (UL, CSA)
760W (max.)
Dimensions ........ 526.6(W)x173(H)x411.5(D) mm
20-3/4(W)x6-13/16(H)x16-3/16(D) in
WINE se elsa ucenetota biela à = a 19.1 kg (42 1b 3 oz)
Furnished Parts
EM type Antenna 2... о » » à foto aa “a aTe € € 6 a ee 1
Operating Instructions ..... : >=. « «veia > e a a leía 1
Hex Wen : - ayant > Ce E CEC AT a 1
* Measured pursant to Federal Trade Commission's Trade
Regulation rule on Power Output Claims for A mplifiers.
NOTE
Specifications and the design subject to possible modification without notice due to improvements
HEX WRENCH
The accessory hex. wrench is provided for removing the
TUNING knob or tightening its setscrew in event it
becomes loose.
If required, loosen the setscrew by inserting the wrench
into the hole on the side of the knob and turning the
wrench counterclockwise. Be particularly careful not to
scratch the front panel when employing the wrench.
19
<77K02M0B31)
Printed in Japan
(ARB-162-0>
PIONEER ELECTRONIC CORPORATION
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
U.S. PIONEER ELECTRONICS CORPORATION
85 Oxford Drive, Moonachie, New Jersey 07074, U.S.A.
PIONEER ELECTRONIC (EUROPE) М.М.
Luithagen-Haven 9, 2030 Antwerp, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD.
178-184 Boundary Road, Braeside, Victoria 3195, Australia
a — SS he lana — di
L,

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Key Features

  • Dual Gate MOS FETs
  • Heavy Duty Split Power Supply
  • Precision RIAA Phono Equalizer
  • High Reliability Protection Circuit
  • Versatile Tone Controls
  • Direct Coupled Power Amplifier
  • Tape Monitor Circuits
  • Microphone Input
  • Audio Muting Switch
  • Indicator Lamps

Related manuals

Frequently Answers and Questions

How do I connect the speakers to the SX-950?
The SX-950 has three sets of speaker terminals labeled A, B, and C. Connect the speakers to the A terminals for normal use. Be sure to connect the positive terminal of the speaker to the positive terminal on the receiver and the negative terminal of the speaker to the negative terminal on the receiver.
What are the different functions of the FUNCTION selector buttons?
The FUNCTION selector buttons allow you to choose the program source of audio you want to play. The options are AM, FM, PHONO 1, PHONO 2/MIC, AUX, and TAPE MONITOR 1/2.
How do I use the TONE controls?
The TONE controls enable you to adjust the quality of sound by adjusting the bass and treble settings. You can select the frequency at which the BASS and TREBLE controls begin to act by using the BASS TURNOVER and TREBLE TURNOVER switches.
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