Rotel RA-611 Stereo Amplifier User Manual

Rotel RA-611 Stereo Amplifier User Manual
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owner’s manual
TABLE OF CONTENTS
INTRODUCTION L....2secesa aa se sen e nee es encadre nana a erecaneneerec ce.
REAR PANEL CONNECTIONS .
INSTALLATION ieee ies
FRONT PANEL CONTROLS ...
SPECIFICATIONS ote i ea 0er eine dere een ee
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We would like to take this opportunity to thank you for
purchasing our Stereo Amplifier. With the high quality
design and workmanship that goes into making this
equipment, you can be assured of its flawless performance
for many years to come.
We have fitted every control and feature you could
conceivably need. Designed for both versatility and ease
of operation, this piece of equipment will add professional
studio flexibility to your Hi-Fi sound center. The per-
formance is exceptional; it will allow you to experience
STEREO ROCORD PLAYER
STEREO
8-TRACK PLAYER
© STEREO
TUNER
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000 STEREO
© © TUNER
STEREO RECORD PLAYER
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true high fidelity as never before. Its full and natural
stereophonic reproduction offers you musical entertain-
ment approaching that of live performances. We sincerely
hope you will treasure this professional equipment. In
order to obtain the maximum use out of your unit, please
read the following pages .of this Operating Manual
carefully.
Do not attempt to operate the unit until you have made
all the necessary connections.
STEREO TAPE RECORDER STEREO TAPE RECORDER
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INPUT OUTPUT INPUT OUTPUT
SWITCHED AC OUTLETS
MAX 200W
CAUTION: DISCONNECT SUPPLY CORD BEFORE
OPENING COVER OR CHANGING Fusk.
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AC POWER CORD
AC FUSE
3A, 100 — 120V
1.5A, 220 — 240V
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STEREO
TAPE RECORDER
(WITH DIN PLUG)
— | + UNSWITCHED
OO] OO] AC OUTLET
SPKR-1 SPKR-2 SPKR-1 SPKR-2 SPEAKER
RIGHT SPEAKERS LEFT SPEAKERS FUSES, 3A
INSTALLATION
IMPORTANT: Do not apply power to this unit without
first making sure that speakers are connected properly and
all the other necessary connections are made.
SPEAKER CONNECTION
This unit is equipped with quick-insert jaw-snap terminals
for connecting two sets of speakers. Connect your main
pair of speakers to the terminals marked SPKR-1. Ensure
that your right speaker is connected to the terminal
marked + and that the ground (—) terminal on the right
speaker is connected to the terminal marked — on the
extreme left of the terminal block. Similarly, connect
your left speaker between the adjacent SPKR-1 terminals
marked + and —. If you wish to connect a second pair of
speakers, connect them to SPKR-2 terminals in the
manner described above.
Caution: Ensure that the speaker leads are fastened
securely to the proper terminals, and that there are no
stray strands which may cause shorting between terminals.
If 2 sets of speakers are played simultaneously, the
impedance of each unit should not be less than 8 ohms.
Phasing:
When all connections have been made, and the unit is
operating, a check on correct speaker phasing should be
made. This is described in a later section.
RECORD PLAYER CONNECTION
The shielded cables from your stereo record player should
be terminated with RCA type phono plugs. To avoid loss
in the high frequencies, the cables should not exceed 10
feet (3 m) in length.
Connect both leads from your record player to the LEFT
and RIGHT PHONO input receptacles on the rear chassis.
If your record player has a ground cable emerging besides
two input cables, connect this ground cable to the ground
terminal post marked GND on the rear chassis.
This amplifier has two sets of PHONO input receptacles to
accommodate two record players. The PHONO 1 is
suitable for record player with regular magnetic cartridge.
The PHONO 2 is also for record player with magnetic
cartridge.
If you wish to use ceramic cartridge, connect your record
player to either of AUX input receptacles.
TUNER CONNECTION
Connect the outputs of your stereo tuner to the LEFT
and RIGHT TUNER input receptacles on the rear chassis
with shielded cables. If you have another tuner, connect it
to AUX 1 or AUX 2 receptacles.
AUX CONNECTION
Your amplifier has two pairs of AUX input receptacles for
use with high level program sources: tape recorder, tuner,
cassette recorder, 8-track cartridge player, TV sound or a
ceramic microphone. tt should be noted that AUX is used
only for the playback purpose, and for recording see
TAPE RECORDER CONNECTION below.
When connecting a stereo tape recorder, connect both
output cables to the AUX LEFT and RIGHT input jacks
on the rear chassis. For cassette or 8-track cartridge,
similar procedure is followed. When connecting a mono-
phonic equipment, connect the single output lead to
either of the AUX LEFT or RIGHT input jack.
TAPE RECORDER CONNECTION
Terminals are supplied for connecting two tape recorders
(which incorporate playback preamplifier). Connect the
right and left output cables of the tape recorders to the
TAPE MONITOR terminals marked IN, and connect its
right and left input cables to the TAPE MONITOR
terminals marked OUT. If you have tape recorder with
DIN-type plug, connect it to the REC/PB DIN socket.
PRE AMP OUT AND MAIN AMP IN RECEPTACLES
There are pairs of terminals marked PRE AMP OUT and
MAIN AMP IN, connected with a pair of jumper pins on
the rear chassis. Normally with the pins in piace, your
receiver is the combined equipment of integrated pre-
amplifier and main-amplifier sections. However, by remov-
ing the jumper pins, your unit in essence becomes two
independent components consisting of one pre-amplifier
and one main-amplifier.
These receptacles are intended for use with any necessary
equipment designed to be installed between the pre-
amplifier and the main-amplifier or for separate use of
either section alone. Such equipment as electronic audio
equalizer or reverberation unit can be used; cr another
pre-amplifier or main-amplifier may be hooked up. Simply
disconnect the jumper pins and follow the instructions
supplied with the accessory equipment. When no auxiliary
equipment is being used, the jumper pins MUST be
installed in place in order to use your amplifier.
AC OUTLET
Your amplifier is equipped with two switched AC Outlet
to provide power and switching control to whatever
component you may wish to connect to the unit.
However, the total load of equipment connected to the
AC Outlets must not exceed 200 watts. In addition, one
unswitched AC Outlet is supplied but without switching
control by the POWER switch.
VOLTAGE SELECTION
The amplifier is a variable voltage equipment that can run
on 100V, 117V, 220V or 240V power supply. Your unit
comes already preset at the proper voltage for use in your
area; however, if you move to an area where the power
supply voltage is different, the voltage setting can be
manually changed. BE SURE THAT YOUR UNIT IS NOT
CONNECTED TO THE POWER SOURCE BEFORE
ATTEMPTING TO MAKE THIS CHANGE.
To change the voltage setting, remove the name plate on
rear panel, and pull up the Voltage Selector plug which
has a white arrow on its top (see figure below). Reinsert
the Plug to the Selector Base so that the head of the arrow
lines up with the pointer line of the voltage you desire.
240V—/ Nv
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220V — ——i00V
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CONNECTING TO POWER SUPPLY
Before connecting up ensure that the voltage selector is
set correctly for your supply, and a suitable plug fitted. If
you need to fit a plug, ensure live, neutral and (where
appropriate) earth leads are connected to the proper
terminals. Ensure the terminals are screwed down firmly,
and no loose strands of wire are present.
The unit is protected with a 3 amp fuse in the AC input
circuit. In addition, the DC circuits and the speaker
circuits are protected by two 3 amp fuses. When replacing
a fuse, be sure to use a fuse of the same rating. DO NOT
replace with a fuse of higher rating. Protection will be
lost, and severe damage to the unit may result.
If in any doubt about connecting to the power supply,
consult a qualified electrician.
FRONT PANEL CONTROLS
HIGH FILTER SWITCH ~~~
LOW FILTER SWITCH === |
POWER SWITCH ~~ ~~
PILOT LAMP - --
PHONES
RECEPTACLE -
SPEAKERS CONTROL -—-——<-———
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BASS CONTROL
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TONE SWITCH
| MODE SWITCH
LOUDNESS SWITCH
——— MUTING SWITCH
~———VOLUME CONTROL
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— BALANCE CONTROL
— — INPUT SELECTOR CONTROL
MONITOR CONTROL
TREBLE CONTROL
VOLUME CONTROL regulates the sound level of any
program material fed into the receiver. The control affects
both channels equally, eliminating regular balancing.
Rotate clockwise for increase in sound level.
BALAYE E CONTROL regulates the relative outputs
from the two channels. Normally the balance control is
adjusted to provide the effect of a mono signal coming
from a point midway between the speakers. When
balanced in this way, the maximum stereo effect will be
achieved. Slide to right for increase in sound level from
the right channel, and to left for the left channel.
THERE CONTROL regulates high frequency sounds,
as desired, to suit personal taste, speaker characteristics,
etc. The center position gives normal (flat) frequency
response. Sliding upward increases the treble, and down-
ward reduces the treble.
BAS CONTRO: regulates low frequency sounds, and
operates in the same manner as the treble control.
INPUT SELECTOR: enables you to select the function
you desire from PHONO 1, PHONO 2, TUNER, AUX 1
and AUX 2.
SPELFERS CONTROL: allows you to select your
speaker systems for activation. “OFF” to deactivate all
speaker systems when such as listening to your head-
phones privately; “1” to activate your speaker systems
connected to SPKR-1 terminals on the rear chassis; 2?” to
activate your systems connected to SPKR-2; ‘“1+2” to
activate both systems SPKR-1 and SPKR-2.
MORITOFR COT-0: allows you to playback,
monitor, and dub (record each other) two tape recorders.
TAPE 1 and TAPE 2 receptacles on the rear chassis each
has a pair of output and input RCA jacks and one DIN
connector jack. “1 — 2” to dub the tape recorder
connected to TAPE 1 by the tape recorder connected to
TAPE 2; “2 > 1” to dub the other way ‚around. ‘1
PLAY" to playback the tape recorder connected to TAPE
1, and "2 PLAY” to playback the tape recorder con-
nected to TAPE 2. Set to “SOURCE” position whenever
tape recorder is not being played but other material is
being played.
If your tape recorders have separate playback heads, ''1
PLAY” and ‘2 PLAY" positions can be used as monitors
when recording; setting to either of this position will
allow you to listen to program as actually being recorded.
So you can compare while recording program being
playing ( “SOURCE” position) with same program being
actually recorded (monitoring).
FONTE Y INDICA 16 101117. allows visual indication
that power is activated.
The push button switches used are all of the PUSH/PUSH
type; that is push in to activate the circuit and push again
to release or de-activate the circuit, In describing these
switches we will consider the “IN” position to be “ON”
and the “OUT” position to be “OFF”.
VIJTING SWiIlCii: allows you to reduce the level of
volume by -20db for momentary quieting wher you do
not wish to change the volume setting buc must lower
volume temporarily.
LOUDNESS SWITCH in "ON" position activates a
circuit which boosts low and high sounds at low volume
control settings. This compensates for the ears loss of
sensitivity to bass and treble notes at low listening levels.
MODE SWITCH. allows you to select the mode of
operation — monophonic or stereophonic. Normally, it
should be left off at STEREO position.
TONE SWITCH: permits you to deactivate the tone
control circuit and provide an absolutely linear flat
response when in “DEFEAT” position. Leave at
“NORMAL” position when wish to use tone controls,
pn
HIGH FILTER: allows you to reduce the high frequency
response of your amplifier whenever you wish to reduce
annoying record scratches, tape hiss, FM background
noise, etc.
Lowy if TER allows you to reduce the low frequency
response of your amplifier whenever you wish to reduce
annoying record and tape rumbles, etc.
MENE SAIT + performs the function as its name
denotes. |t supplies power to the receiver and to the
switched AC outlets. When the switch is “ON”, power
indicator will be illuminated.
PHONES KECEF ACio Simply plug in your head-
phone lead and switch off unwanted speakers for private
listening.
OPERATION
Having made all connections according to the preceding
instructions and become familiar with the functions of the
amplifier, you are ready to operate the equipment. Apply
power by plugging into the power source and pushing
“IN” the POWER button. Select the speakers you wish to
use by turning the SPEAKERS control.
PRELIMINAR Y CHECKS:
1. If the dial light has failed to illuminate, remove and
check the AC fuse,
2. If no sound is heard when all switches and controls are
correctly positioned, remove and check the DC fuses.
If a fuse or fuses are blown, check possible reasons for
the blowout and replace the fuse.
3. The phasing of the speakers should be checked. If the
two speakers are out of phase, the stereophonic effect
will suffer. Check as foltows:
a) Set the MODE switch to MONO.
b) Tune in a program with a distinct solo part (e.g.
voice).
If the speakers are in phase (correct connection) the
solo will appear to come from the center point
between the speakers, If they are not in phase, the
sound will appear to come from the two speakers
separately.
If the phasing is wrong, reverse the Y and O speaker
connections.
—
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—
TUNER
Turn the input selector control to the TUNER position,
and set the mode switch to STEREO or MONO depending
upon the program selected. Use all other controls and
switches according to taste and listening conditions. Set to
the AUX 1 or AUX 2 if your tuner is connected to either
receptacles. Note: Before operating your tuner, be sure to
read the operating manual or information of the tuner.
RECORD PLAYER
Turn the input selector control to PHONO 1 or PHONO
2, depending on the record player you wish to operate.
Set the mode control to STEREO or MONO depending
upon the mode of the record disc selected.
PLAY BACK OF TAPE RECORDING
1. When using AUX inputs
Turn the input selector control to the AUX position,
and set the MODE to your choice.
2. When using TAPE MONITOR inputs
To listen to a playback of pre-recorded tape, turn the
mode control to 1 PLAY or 2 PLAY depending on which
tape recorder you wish to use. The setting of the input
selector control is irrelevant in this case and may be left at
any position.
MAKING TAPE RECORDINGS
To make off-the-air recordings, turn the input selector
control to TUNER or AUX depending on whizh your
tuner is connected, and to record off record discs set to
PHONO 1 or PHONO 2. To record off the equipments
such as cassette recorder connected to AUX 1 or AUX 2,
turn to AUX 1 or AUX 2,
To record off (dubbing) the tape recorder connected to
TAPE 1 by the tape recorder connected to TAPE 2, turn
the monitor control to 172. Set to 21 1f the other way
around,
If your tape recorder is equipped with a separate playback
head, turning the monitor control to 1 PLAY or 2 PLAY
will cause the input source to be bypassed and will permit
you to listen to the recording being made on the tape.
Setting at the SOURCE position will permit you to listen
to the input source. Thus, with the monitor control you
may monitor or compare the recording being made with
the source being recorded. When dubbing, only the tape
recorder that is recording will be monitored.
WHERE TO PLACE
Since transistors are extremely susceptible to heat, the
amplifier has been designed to diffuse heat through the
top and rear of its case. Therefore, special consideration
should be given to where it will be used before installing
the system. It should not be operated in a place where it is
exposed directly to the sun, near radiators or other
heat-generating sources, and it should never be mounted
in an air-tight cabinet. Finally nothing should be placed
on top of it.
GROUNDING
Connect one end of vinyl or enameled wire to the
terminal screw marked GND on the rear of the amplifier,
attach a copper plate to the other end, and bury it
underground,
HUM AND NOISE
In any high fidelity installation, hum may be caused by
the interconnection of a record player, tuner and ampli-
fier, as a result of the cables and different grounds. If hum
is experienced with your amplifier, disconnect everything
but the speakers from the unit. If hum persists, reverse the
AC line cord. Plug in the record player and if hum
appears, reverse the record player power plug and connect
a single lead from the record player chassis to the ground
Total Music Power (IHF) 140 watts at 4 ohms
Continuous Power (RMS) 35 watts/channel at 4 ohms
(both channels driven, THD less than 1.0%) 30 watts/channel at 8 ohms
Harmonic Distortion tess than 0.1%, 1 KHz
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at 25w/ch
Intermodulation Distortion ..............—.7.. 0.1% at 25w/ch
Frequency Response 4 to 75,000Hz, +0db —3db
Power Bandwidth (IHF) 5 to 50,000Hz at 8 ohms
Input Sensitivity/Impedance ................... 1V/30k ohms
Damping Factor een 35 at 8 ohms
Speaker Impedance nn. 4 to 16 ohms
Output Voltage ..................evercnrerceece. 1V (rated), 3V (maximum)
Harmonic Distortion нение. less than 0.1% at rated output
voltage
Frequency Response ................mecveecormeeno 3 to 50,000Hz, +0db —3db
Hum and Noise:
PHONO 1, PHONO 2 ee 65db
TUNER, AUX1, AUX2, TAPE IN....... 75db
Residual Noise ...................ervecrcicarieon 1.5mV
Input Sensitivity/Impedance:
PHONO 1,PHONO 2 ..........enne o.
TUNER, AUX1, AUX2, TAPE IN.......
TAPE DIN eee.
2.5mV/50 ohms
200mV/45 ohms
330mV/100k ohms
EEF type, RIAA +0.5db 50 to
15,000Hz
Phono Overload ................—..ee.iesiiiieeo recen 100mV
Loudness SWItch...........e.e.eeeeeerrceerereenene. +10db at 50Hz, +6db at
10,000Hz
post on the rear chassis. Connect your other clevices in
this manner.
Hum may also be induced by defective con-
necting cables or by running these cables too close to a
strong AC field.
High Filter ieee eee, —10db at 10K Hz
Low Filter ..............eee.ere.ceeerercerevecarerenraras —10db at 50Hz
Muting Switch .......e.e.eeorcecconacoarcecee ee —20db at 1,000Hz
Bass Control ..........e.......eeeeccreseer Des + 10db at 50Hz
Treble Control... +10db at 10,000Hz
Crosstalk ...............eeeccocenaroecoreeeeo nene eee 43db at 1,000Hz
Power Requirements ....................esme.o 100, 117, 220, 240V 50/60Hz
Power Consumption...............esersccrernes 150 watts (maximum)
| Note: features and specifications subject to changes for improvement without prior notice. |
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