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HOW TO BUILD A 4-CHANNEL STEREO SYSTEM
te
4-CHANNEL
Compared to 2-channel stereo reproduction, a 4-channel
cits Duda
SPEAKER SYSTMS
system offers numerous advantages. It can reproduce a
life-like sound
field including indirect and reverberated
sound
as heard in a concert hall. It can give distinct
localization of sound sources at the front, sides and rear.
It can create special effects such as '"'surround sound" and
motion of sound sources in any desired direction. Where
a 2-channel system will recreate only what takes place on
the
stage, a 4-channel
system can re-build the total
musical
environment.
Such a 4-channel system can be built as shown in Fig, 12,
by adding the Pioneer 4-channel decoder amplifier, model
QL-600A, and another pair of speakers for the rear chan-
nels. Connections and operational details are explained in
the operating instructions of model QL-600A.
| SPEAKER TERMINALS
|!
i———§
OREO O
emmooon | (XO
QL.-SO0A | |
TAPE DECK
Fig, 12
CONDITIONS FREQUENTLY MISTAKEN
FOR MALFUNCTION
_In the case of a malfunction, please consult the following
chart — the trouble is often caused by a mistake in opera-
tion. Also
check the other components of your stereo
system,
because
the
malfunction
may
have occurred
there.
=
TROUBLE
|
PROBABLE CAUSE
REMEDY
Intermittent
high-pitched
noise
| Automobile
ignition systems without noise | Install high-gain special FM antenna. Direct antenna
during FM reception.
suppression,
away
from
streets with
heavy
traffic.
If noise
High-frequency
welding and plastic sealing | persists, lodge complaint
with radio communica-
equipment operating nearby.
tions authorities.
More noise in FM stereo than in | Reach of FM stereo broadcasts is only half | Install special FM antenna with high gain.
FM mono programs.
that of mono broadcasts.
Hum
or
buzzing
noise
present
| a) Insufficient shielding of turntable autput
| a)
Replace
turntable
output
cables with
good
;
!
only when playing records.
cables.
shielded cables.
|
|
b) System not grounded.
b} Check ground connections motor-to-amplifier, |
c} TV transmitter nearby.
tonearm-to-amplifier,
amplifier-to-ground.
c) Consult Pioneer dealer or service station,
RECEPTION
RADIO
Turntable
picks
up
ham
radio
| Ham radio transmitter operating by.
Consult Pioneer dealer or service station, discuss
transmissions.
|
| matter with ham radio operator.
Noisy, unclear treble sound from
| a) Worn pickup stylus.
| Check points (a) thru (e),
records.
b) Worn record.
c) Oust on pickup stylus,
d) Faulty mounting or connection of pick-
up cartridge,
e) Stylus tracking force too high or too low.
:
f} TREBLE
controls turned up too high. | f) Turn down treble controls,
TURNTABLE
OPERATION
Howling occurs when volume is | Turntable placed too close to speakers, or | Remove
turntable
farther from
speakers. Turn | |
turned
up.
on unstable surface.
down
BASS controls. Install shock-absorbing pads -
|
under turntable,
15
|
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