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Three-channel mode {stereo + mono}
The power amplifier ig basically a two-
channel/one-channet bridgeabie amplifier,
but three channels can be achieved by
combining the stereo and mono
modes
using inductors and capacitors. See Figs. 16
and 17 for details of wiring.
+ The foliowing Figs. 16 and 17 require
advanced understanding of electronics.
# you do not understand the diagram,
please have the work done by your
nearest authorized Pioneer installation
specialist.
Three-channel mode, two-way system
Green cover
eft)
Woofer
{mono}
Mid-high
(right)
Biack cover
Fig. 16
Three-channel mode. three-way system
High
Ps
md. von) D
tet
Nadi
mid owes) SY
det
Wooler!
sub
woofer
imono}
Migs
Pe Laghsdeat
Green cover
mid-bass:
(right
Highy
rae
mid-high
fright)
Fig. 17
» The inductor (L7 or L2 in the diagram)
acts as a low-pass filter. The capacitor (C1
or C2 in the diagram) acts as a high-pass
filter. The inductor (L) shail be used on
the woofer/sub-woofer, and capacitor (C)
shall be used on the high/mid-high
Remember when bridging an amplifier it
will see only half of the original speaker
impedance.
Therefore, you must use
speakers that have ratings of 4 ohms or
higher. If you use speakers that have
lower impedance ratings it may cause
damage fo the amplifier.
When the inductors and capacitors are
connected to the speaker wires, secure or
solder them so they cannot be pulled
loose. Tape or use heat shrink on the
joints to prevent short circuits.
a
y
=.
Black stripe.
ao
Black cover
GM-202
,102
Setting the Filter Constant
Low pass filter (for sub-woofer/
woofer
6 dB/octave (Fig 18)
Fig. 18
High-pass fitter (for mid/mid-high}:
6 dB/octave (Fig. 19)
OaB ap -
6dB
cr
P——ib,
o~ aed
|
eG
2
Fig. 19
Band-pass fitter (combination of low-pass
fitter and high-pass filter for
mid-bass/mid):
6 dB/octave (Fig. 20)
L2
C2
ib
|
11. OPERATIONS AND CONNECTION(GM-102/X1H/UC)
iy
12}
{6}
{6} (5)
{17}
Fig. 21
{2}
{16}
Fig. 22
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