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Pioneer GM-5000T Owner's Manual page 3

Bridgeable power amplifier
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Connecting the Unit
Connecting the Power Terminal
4. Connect the wires to the terminal.
• Fix the wires securely with the terminal
• Always use the special red battery and ground
screws.
wire [RD-223], which is sold separately. Connect
the battery wire directly to the car battery positive
GND terminal
terminal (+) and the ground wire to the car body.
Power terminal
System remote
control terminal
1. Pass the battery wire from the
engine compartment to the interior
System remote
of the vehicle.
control wire
• After making all other connections to the
amplifier, connect the battery wire terminal of
the amplifier to the positive (+) terminal of
the battery.
Engine
Fuse (30 A)
compart-
Interior of
ment
the vehicle
Battery wire
Fuse (30 A)
Drill a 14 mm
Positive terminal
(1/2 inch) hole
Insert the O-ring rubber
into the vehicle
grommet into the vehicle
body.
body.
2. Twist the battery wire, ground wire
and system remote control wire.
Twist
3. Attach lugs to wire ends. Lugs not
supplied.
• Use pliers, etc., to crimp lugs to wires.
Lug
Ground wire
Lug
Battery wire
Connecting the Speaker Output
3. Connect the speaker wires to the
speaker output terminals.
Terminals
• Fix the speaker wires securely with the termi-
nal screws.
1. Expose the end of the speaker wires
Terminal screw
using nippers or a cutter by about
10 mm (3/8 inch) and twist.
Twist
Speaker
10 mm
Ground wire
output
(3/8 inch)
terminal
2. Attach lugs to speaker wire ends.
Lugs not supplied.
• Use pliers, etc., to crimp lugs to wires.
Lug
Speaker wire
Connecting the Speaker wires
The speaker output mode can be two-chan-
nel (stereo), one-channel (mono), or three-
channel (stereo + mono). Connect the
speaker leads to suit the mode according to
the figures shown below.
Two-channel mode (stereo)
Speaker wire
(Right)
Speaker
(Left)
One-channel mode (mono)
Speaker (Mono)
Three-channel mode (stereo + mono)
The power amplifier is basically a two-
channel/one-channel bridgeable amplifier,
but three channels can be achieved by
combining the stereo and mono modes
using inductors and capacitors.
Setting the Filter Constant
Three-channel mode, two-way system
Low-pass filter (for subwoofer/woofer):
6 dB/octave
L1
Mid-high (Right)
C1
Woofer (Mono)
L1
Mid-high (Left)
C1
High-pass filter (for mid/mid-high):
6 dB/octave
C1
Three-channel mode, three-way system
–6dB
High/mid-high
C1
(Right)
Mid/mid-bass
L2
C2
(Right)
Woofer/subwoofer
L1
(Mono)
Mid/mid-bass
L2
C2
(Left)
Component Guide
High/mid-high
C1
(Left)
Speaker load Impedance
• Inductors (L1 and L2 in the diagrams)
fc (Hz)
act as low-pass filters. Capacitors (C1
50
and C2 in the diagrams) act as high-pass
filters. Inductors (L) are used for the
80
woofer/subwoofer, and capacitors (C)
125
are used for the high/mid-high.
200
• Remember when bridging an amplifier it
320
will see only half of the original speaker
500
impedance. Therefore, you must use
speakers that have ratings of 4 ohms or
800
higher. If you use speakers that have
1,250
lower impedance ratings it may cause
2,000
damage to the amplifier.
3,200
• When the inductors and capacitors are
connected to the speaker wires, secure or
5,000
solder them so they cannot be pulled
8,000
loose. Tape or use heat shrink on the
10,000
joints to prevent short circuits.
Band-pass filter (combination of low-pass
filter and high-pass filter for mid-
bass/mid): 6 dB/octave
0dB
L2
C2
0dB
–6dB
–6dB
f
f
2f
C
C
f
f
f
2f
CL
CL
CH
CH
2
• A multi-channel system can be set up using a
combination of filters. The inductance (L) and
0dB
capacitance (C) will determine the frequency (fc)
that the speaker will reproduce. Refer to the chart
below to determine the components required.
• Use the capacitors specified. Non-polarized capac-
f
itors rated at over ±25 V should be used for C1
f
f
C
C
2
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 25 V.
This will prevent a safety hazard.
4 Ω
8 Ω
2
L (mH)
C (µF)
L (mH)
C (µF)
L (mH)
C (µF)
6.4
1,600
12.70
800.0
25.50
400.0
4.0
1,000
8.00
500.0
16.00
250.0
2.5
640
5.10
300.0
10.00
160.0
1.6
400
3.20
200.0
6.40
100.0
1.0
250
2.00
125.0
4.00
62.0
0.64
160
1.30
80.0
2.60
40.0
0.4
100
0.80
50.0
1.60
25.0
0.25
64
0.50
30.0
1.00
16.0
0.16
40
0.30
20.0
0.64
10.0
0.1
25
0.20
12.5
0.40
6.2
0.06
16
0.13
8.0
0.26
4.0
0.04
10
0.08
5.0
0.16
2.5
0.03
8
0.06
4.0
0.13
2.0

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