Marantz 7 Owners Manual

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maranh%w console

Model 7
INSTRUCTION MANUAL

You will find the model 7 straightforward and remarkablv easy to use. The basic controls are the four large
knobs grouped to the left. These are the SELECTOR, VOLUME control. stereo/monophonic MODE selector. and
BALANCE control. The latter is merely a means for adjusting stereo programs so that they appear to be natur-
ally and evenly spread out between the two loudspeakers. With the exception of the Power Switch. all the other
controls may be left in their normal center positions until you have become familiar with their purposes.

PRELIMINARY NOTES

UN PACKING

After unpacking, replace all fillers and the plastic protective wrap in the carton for storage. Should it
ever become necessary to ship the ruodel 7 to another location, it must be packed in exactly the some man-
ner in order to prevent internal or surface damage. The pectin has been designed to support the unit
finnly but wirhoul pressure on the tubes, knobs, or other proicclrons. The plastic wrap protects the finish
from abrasion.

WARRANTY

A warranty card, hearing the serial number of the unit you purchased and listing warranty terms, is
enclosed 'llh every unit that leaves our plant. For your rotcction it is most important that you properly
fill in this card and return it promptly after purchase. Sliould you not find this card enclosed it is the
responsibility of the dealer from whom you purchased the unit to supply this card to you.

INSTALLATION

MECHANICAL

I. Shock-mount Release Remove the large chrome-plated screw located nearest the central area of the
bottom plate. This is an 8-32 x W" screw which must be firmly replaced whenever the unit is to be

shipped.

2. Mounting A cutout H Sf. wide by 5 it?" high will just clear the chassis and proiecting screw-heads.
The front panel is larger than this dimension and will hide the edges of the cutouL Four small starti
holes should be drilled for the #4 oval-head mounting screws. Their positions should be carefully local
by temporarily inserting the preamplifier. Do not. use the panel as a drill guide - a slip may result in

damage.
When planning the installation try to arrange the associated corn nents so that their power trans-
formers are not too close to the preamplifier, especially the side towa the Selector. This Will minimize

the possibility of inductive hum pickup.

ELECTRICAL
l. Powering Plug the power cord into a source supply 105 to 125 volts. 50 to 60 cycles AC only.

2. AC Convenience Outlet: 0n the rear panel are 6 AC outlets to he used for powering associated com-
ponents, such as am Iifiers and tuners. Five of these are controlled by the front-panel Power Switch.
Fbe sixth. marked nswitched Outlet". remains live and may be used for any turntable which must
be controlled by its own switch.

SIGNAL CONNECTIONS

All signal connections to the Stereo Console should be made with standard shielded audio cables.
0n the rear panel are two horizontal rows of in ut and output jacks. The upper row is marked Chan-
nel A", and feeds the left side of the system. T 0 lower row is marked Channel B". and refers to the
right side of the system. Channel A is generally used for monophonic sources.
I. Amplifiers Connect a shielded cable between the left" amplifier and one of the Channel A output
iacks marked To Amplifiers". Similarly, connect the "right" amplifier with the corresponding Channel
I} output. There are two jacks connected to the output of each channel and either may be used (the
spares may he used for bridging other high impedana- devices across the outputs).
NOTE: If the amplifiers have input gain controls these should normally be turned up fully clock-
wise. Amplifier gnin controls often have on adverse effect on transient response und stability.

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2. Tuner:

n) [I'M-AM: Plug the FM tuner into Channel A, and AM tuner into Channel B. To use either
one monophonically turn the MODE knob to the corresponding channel. For FM-AM stereo
reception turn the MODE to "SFEREO".

b) FM (multiplex): Connect the cltannel A or left output of a multiplex tuner or adapter into
the upper "FM (Multiplex)" input and the channel B or right output to the lower input.

c) TV: Monophonic TV sound may be connected to Channel A. Stereo broadcasts in combina-
tion with AM or FM may be treated as described in the FM-AM" paragraph above by insert-
ing the second source into Channel B.

3. Tape

a) TAPE-HEADS: Connect to Tapehead inputs. Follow the manufacturer's recommendation
for optimum cable capacitance and resistive termination. It may be necessary to ground tlte
tape deck to the preamplifier Chassis Ground" to reduce excesstve hum.

b) TAPE RECORDER: Connect the recorder-'5 playback outputs to the preamplifier "Tape" in~

uts. Also, connect the room )lifier "Recording Outputs" to the inputs of the tape recorder.

re program source to w ich e SELECTOR is turned will be fed from the Recording Out-
puts. To listen to tape playback or (where the machine has this facility) to monitor a record-
ing, depress the TAPE" lever.

c) A second machine can be connected to the Auxiliary" inputs if it is not to be used for
recording.

4. Phone Two sets of Phone inputs are provided. Both may be used for stereo connection or. if desired,
one set for a stereo cartridge and the other for one or two monophonic cartridges (one in each channel).
Pbono equalization is automatically applied by the SELEC'IOIL

The procedure outlined below will minimize the possibility of burn pickup:

a) Connect a separate unding wire between the tum-table chassis and the Chassis Ground"
on the rear panel 0 the preamplifier.

b) 11' the amt is mounted on a wood el or is otherwise insulated from the turn-table, it too
should be connected to the man ng wire with a short jumper wire to the arm base or one
of its mounting screws. If e two pairs of si wires in the arm have a single overall shield,
this may be grounded instead of the arm itse f.

c) Keep the two in ut connecting cables and the grounding wire closely together. In three-wire
(common groan ) systems this will minimize ground loops. Where a second arm is mounted
on the same turn-ta 1e. group its cables witht e others. neat method is to twist them loosely
together and bind with a turn of electrical tape at each end.

5. Microphone Frequency response will be flat at this position of the SELECIOR. These inptts have an
impedance of one megohm.

LOUDSPEAKER CONNECTION AND PLACEMENT

Ordinary 18 gauge lamp cord may he used for connection between an amplifier and loudspeaker if the distance
is short. if more than 25 or 30 feet is required, it would be advisable to use a heavier gauge to reduce power-
loss and damping factor deterioration.

Phasing of loudspeaker-s will be made easier if each lead wire can be coded for identification. One wire in
each pair can be coded at both ends with a knot, tape. or other device. The coded wires can then be used for
idenuoal connections. As an example, the coded wires may be connected between the common" terminals of
each speaker, and the common or ground terminals of their amplifiers. The uncotled wires may then be cott-
nected between the remaining speaker terminals and the recommended im once tap on the am lifiers. This
procedure will nomutlly insure correct espealter plursiu if the speakers an amplifiers are idonticn .

pcalter placement cannot be deter-min by fixed ru e. Generally. it is better to place speakers symetrically
in relation to corners to avoid unbalanced wall reflections. For rectangular rooms, speaker placement usually
seems best along a short wall.

Spacing between speakers depends entirely upon room site and listening distance. Wide spacing does not neces»

sari|lly produce the so-cnllcd hole in the middle", but may merely spread the sound further. A good compromise

sho d be determined by experiment in order to achieve the most natural-sounding s read. Al tough they may

be placed flat against the wall. some experiment with angling of the sunken may rewarding. Sometimes

$e lliiest effect can be secured by directing or beaming the sound from th speakers so as to cross in front of
e stoning area.