Pioneer GM-4200 Service-Handbuch - Seite 6

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GM-H2DO
Example 2 Three-channel, three-wav system
L
L
R
R
o
©
©
©
Left tweeter/
-1
Len twee
Ci
bQ'j mid-high
-II-1
unit
unit
Left
mid-range/
mid-bass
unit
Mono-woofer/
subwoofer
Right
mid range/
mid-bass
unit
Right
tweeter/
mid-high
unit
• The inductor (LI or L2 in the diagram) acts as a low-pass
filter. The capacitor (Cl or C2 in the diagram) acts as a
high-pass filter.
• In the three-channel mode Pioneer recommends that an
inductor (U be used on the woofer/subwoofer, and that a
capacitor (C) be used on the midrange/tweeter. Remem¬
ber 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 to the amplifier.
• When the inductors and capacitors are connected to the
speaker leads, secure or solder them so they cannot be
pulled loose. Tape or use heat shrink on the joints to
prevent short circuits.
Setting the fitter constant
i Low-pass filter (tor subwoofer/woof e r): 6 dB/octave
0"
O-
LI
■Jo]
-OdB
2
High-pass filter (for mid-tweeter/mid-high-tweeter):
6 dB/octave
f
3 Band-pass filter (combination of low-pass filter and high-pass
fitter for mid-bes$/mid): 6 dB/octave
L2
Cl
©—Tmr-
0-
-1!-1
Component Guide
Speaker load
impedance
211
Ail
8Q
!
fc (Hz)
LlmH)
C (gF)
LlmH)
ClgF)
LlmH)
C (gF)
so
5.4
1600
12.7
800
25,5
400
00
4.0
1000
8.0
500
16
250
125
2.5
560
5.1
300
to
160
200
1.6
400
3.2
200
6.4
100
320
1.0
250
2.0
125
4
62
500
0.64
160
1.3
80
2.6
40
800
0.4
100
0.8
50
1.6
25
1250
0.25
64
0.5
30
1,0
16
2000
0.16
40
0.3
20
0.64
10
3200
0,1
25
0.2
12.5
0.4
6.2
5000
0.06
16
0.13
8
0.26
4
0000
0.04
10
0.08
5
0.16
2,5
10000
0.03
_
0.06
4
0.13
2
• A multi-channel system can be set up using a combination of
filters
1
,
2
, and 3 . The inductance (L) and capacitance (C)
will determine the frequency (Hz) that the speaker will
reproduce. Refer to the chart on the above to determine the
components required.
r- WARNING -
• Use the capacitors specified. Non-polarized capacitors rated
at over ±40 V should be used for Cl and C2 in the diagram.
Because of the voltage output of the amplifier it is very
important to use non-polarized capacitors rated at or over
40 V. This will prevent a safety hazard.
6