Pioneer QM-800 User manual

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First. let us thank you for the confidence you have shown
us in purchasing the Pioneer quadraphonic power amplifier.
model OM-800. This amplifier is designed to serve in a
4-channel stereo installation, together with a 4-channel
preamplifier, 4 speaker systems and one or several program
sources. Engineered for highest sound fidelity, it will
open up a whole new world of "environmental sound."
Please read the following instructions carefully to assure
that all connections are made correctly and that the OM-
800 will reveal its true performance quality.
FEATU RES
DIRECT COUPLING OF ALL STAGES
Direct coupling of all amplifier stages greatly improves
phase characteristics and permits an extremely wide fre-
quency response down to near-DC. A load-regulated power
supply unit is employed, and output power is higher than
will ever be required.
LEVEL METERS FOR ALL FOUR CHANNELS
To obtain optimum sound balance in a 4-channel system,
four separate level meters are provided. Moreorrer, the
meters'sensitivity can be adjusted in three stages (0, -10
and -20 dB) to permit accurate readings at all volume
levels.
ADJUSTABLE lNPUT SENSITIVITY
As the power amplifier's input sensitivity can be adjusted
in 6dB steps (at 0.5, 1 and 2 volts), it is easy to match with
any preamplifier
LINE VOLTAGE AND FUSE
CHANGING LINE VOLTAGE AND FUSE
To remove the fuse, turn the fuse cap located on the line
voltage selector in the direction of the arrow. Then remove
the fuse plug from the unit.
Put the fuse plug back so that the proper line voltage marking
can be seen through the cut in the edge of the plug. When-
ever the position of the selector is changed, check the rating
of the fuse. A 2-ampere is to be used for either 220V
or 24OY operation and a 4-ampere fuse for 110V, I20V,
130V operation.
If the rating of the fuse is conect, replace cap.
FUSE REPLACEMENT
If the fuse blows, remove the fuse cap and replace the fuse
with a new one.
SPECIAL HIGH-RANGE SPEAKER OUTPUTS
ln addition to the four normal. full-range speaker terminals.
a set of high-range speaker outputs are provided. The
OM-800 can be used as an exclusive high-range amplifier in
a multi-amplifier installation.
PERFECT PROTECTION OF OUTPUT STAGE
TRANSISTORS AND SPEAKERS
The output transistors are protected from damage (in the
case of overload or short-circuits in the speaker leads) by a
dual system of relay and DC drift voltage detector circuits.
The latter also guard against possible speaker damage by
DC current.
UNIOUE PIONEER EXTERIOR DESIGN
The front panel is attractive as well as logically laid out.
With its natural wooden cabinet, the OM-800 matches
other Pioneer hi-f i components perfectly.
cotN FUSE CAP FUSE FUSE PLUG SOCKET
Take oft the fuse cap by turning it with a coin, etc.
in the direction indicated by the arrow mark.

r'IOI\IEER
COMPOS ITION OF 4. CHANNEL STEREO SYSTEM
4 CHANNEL STEREO
TAPE DECK
To compose a 4-channel stereo system, the QM-800, a solid
state Quadraphonic Power Amplifier, can be combined with
a 4-channel tape deck, a 4-channel preamplifier, and four
speaker systems as shown in Fig. 1.
When the QM-800 is combined with a tape deck, AM/FM
stereo tuner, a turntable, four speaker systems, and a quad-
raphonic preamplifier equipped with a quadralizer circuit
(Pioneer QC-800, for instance) as shown in Fig. 2, a 2-
channel program source can be reproduced in a high degree
of a 4-channel performance. If an electronic crossover net-
work (separately available, Pioneer SF-500 or SF-700.) is
installed as shown in Fig. 3, a 2-way multi-amplifier system
can be set up.
TAPE DECK AM/FM
STEREO TUNER TURNTABLE
4 CHANNEL
STEREO
PREAMPLI FI E
(oc-800)
ELECTRONIC
CROSSOVER
NETWORK
(sF-500)
{sF-700}
TURNTABLE
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SPEAKER SYSTEMS
TAPE DECK
PREAMPLI FIER
(sc-700, sc-1001
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SPEAKER SYSTEMS Fis.2 Fis.3

4.CHANNEL STEREO SYSTEM ARRANGEMENTS
CONNECTION AND POSITION OF SPEAKER SYSTEM
. SPEAKER SYSTEM ARRANGEMENTS
For optimum 4-channel stereo performance, speaker
systeins can be arranged in the following three different
ways:
2 -,2 system: Two speaker systems are positioned in
the front and two speaker systems in the
rear.
3 - 1 system: Three speaker systems are positioned in
the front and one speaker system in the
rear.
4 - 0 system: AII four speaker systems are positioned
in the front.
Descriptions in this brochure are concerned with the
2-2 system, the most popular speaker arrangement.
. POSITIONS
Install four speaker systems as illustrated in Fig. 4.
Front left - Channel 1
Front right - Channel 3
Rear left - Channel 2
Rear right - Channel 4
o CONNECTION
1. Connect the leads from the speaker systems to the
speaker plugs as shown in Fig. 5. Make sure to con-
nect the positive (+) lead to the positive terminal
of the plug, and the negative (-) lead to the nega-
tive terminal. Then, confirm that all connections
are correct.
2. Connect the speaker plug for the Front Left
speaker system (CH. 1) to the receptacle L of the
FRONT SPEAKERS socket. Likewise, connect
the speaker plug for the Front Right speaker
(CH. 3) to the receptacle R of the FRONT
SPEAKERS socket.
3. Connect the speaker plug for the Rear Left speaker
system (CH. 2) to the receptacle L of the REAR
SPEAKERS socket. Likewise, connect the speaker
plug for the Rear Right speaker system (CH. 4)
to the receptacle L of the REAR SPEAKERS
socket.
PREAMPLIFI ER CONNECTION
Connect the outputs of the 4-channel preamplifier (QC-800,
for instance) to the INPUT 1 jacks of the QM-800:
FRONT LEFT output to CH. 1 (FRONT LEFT) input 1
FRONT RIGHT output to CH. 3 (FRONT RIGHT) in-
put 1
REAR LEFT output to CH. 2 (REAR LEFT) input 1
REAR RIGHT output to CH. 4 (REAR RIGHT) input 1
NOTE: Set the INPUT selector switch on the rear panel to 1.
c
(-)
SPEAKER
PLUG
Fis. 5
Two kinds of FRONT speaker socket are
provided on the rear panel; one is marked
SPEAKERS, and the other is marked
SPEAKERS FOR HIGH RANGE. ln a
4-channel speaker system, always use the
socket marked SPFAKEFS.
FRONT LEFT (CH,
LEFT SIDE
SPEAKER
FRONT RIGHT (CH.3}
RIGHT SIDE
SPEAKER
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REAR LEFT (CH, 2}
LEFT SIDE
SPEAKER
REAR RIGHT (CH,4)
RIGHT SIDE
SPEAKER
REAR
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SPEAKER
SOCKET
SPEAKER SYSTEM

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PROTECTOR CIRCUIT
Even if the power switch of the QM-800 is turned on, the
speaker system will not operate for the first 5 to 8 seconds.
This is because the QM-800 is provided with a circuit which
protects transistor, speakers, etc. from possible damage due
mainly to unexpected trouble.
If any of the speaker systems stops operating during a per-
formance, or if mechanical noise (click, click, . . .) of the
relays is heard continuously, a short-circuit in the speaker
leads may be responsible. Turn off the power and check all
speaker connections. Since the protector circuit is very
sensitive, it may be activated if the power switch of the
preamplifier combined with the QM-800 is turned on and
off separately. It is therefore advisable to obtain AC power
for the QM-800 from a switchable AC outlet of the pre-
amplifier, as this guarantees simultaneous on-off switching
of both units.
@
SPE CIF ICAT IONS
SEMICONDUCTORS
Transistors .......................... 39
Diodes ........... 37
POWER AMPLIFIER SECTION
Music Power Output (l H F ) 280 Watts (4fl)
200 Watts (8,fr)
Continuous Power Output 42W + 42W l42W + 42W @{L\
(2 channels drivenl 35W + 35W /35W + 35W (8Sr)
Continuous Power Output 32W x 4 (4O)
(4 channels driven) 25\N x 4 (8O)
Power Output in the range 32W + 32W l32W + 32W (8C2,
ol 2OHz to 20kHz Harmonic Distortion Less than 0.5%)
(2 channels driven)
Harmonic Distortion Less than 0.5% (Continuous power
output)
lntermodulation Distortion Less than 0.5% (Continuous power
output)
power Bandwidth (lHF) bHz to 50kHz (8f,), 2 channels driven
Harmonic Distortion Less than 0.5%)
1 0Hz to SOkHz (8 O,4 channels driven
Harmonic Distortion Less than 0.5%)
Frequency Response 5Hz to 80kHz, 11dB
lnput Sensitivity/lmpedance 0.SV/70kO
(1kHz, Continuous Power 1V/1 1OkC2
output) 2V l170kfl
Speakers
Damping Factor
Hum and Noise (lHF)
Levol Meters
MISCE LLANEOUS
Power Requirements
Power Consumption
Dimensions (overall)
Weight Without package
With package
Furnished Accessories Polishing Cloth
Pin Plug
Connecting Cord
Speaker Plug
Operating I nstructions
-NOTE: Specifications and the design subject to possible modifica-
tion without notice due to improvements
4 to 165} (FRONT, REAR, HIGH
RANGE)
70 (8S,, lkHz)
More than 90dB
odB = 35w/8f,2,
(Sensirivity selector 0dB, -10d8 and
-20d8)
1 10V. 120V, 13OV,22OV and 240V.
(Switchable)
50 - 60Hz
400W (Max)
ro ffi' l+aomm (width)
s ]{' lt+s.. (heisht}
13 # /$7mm (depth)
261b, /11.5k9
301b, /13.Sks
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PRINTED IN JAPAN
'AR8.018.0
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