Pioneer GM-3000T Connecting the Power Terminal, Setting the Filter Constant, Component Guide

Connecting the Unit

Connecting the Power Terminal

•Always use the special red battery and ground wire [RD-223], which is sold separately. Connect the battery wire directly to the car battery positive terminal (+) and the ground wire to the car body.

1. Pass the battery wire from the

engine compartment to the interior

of the vehicle.

• After making all other connections to the

amplifier, connect the battery wire terminal of

the amplifier to the positive (+) terminal of

4.Connect the wires to the terminal.

•Fix the wires securely with the terminal screws.

	GND terminal
Power terminal	System remote
	control terminal
	System remote
	control wire
	Ground wire

3.Connect the speaker wires to the speaker output terminals.

•Fix the speaker wires securely with the termi- nal screws.

Terminal screw

Speaker output

Using the Speaker Input	Connecting the Speaker wires
Connect the car stereo speaker output	The speaker output mode can be two-chan-
wires to the amplifier using the supplied	nel (stereo), one-channel (mono), or three-
speaker input connector.	channel (stereo + mono). Connect the
• Do not connect both the RCA input and the	speaker leads to suit the mode according to
speaker input at the same time.	the figures shown below.
7 Connections when using the speaker	• Do not connect both the RCA input and the
	speaker input at the same time.
input	Two-channel mode (stereo)

Three-channel mode, two-way system

C1 Mid-high (Right)

L1 Woofer (Mono)

C1 Mid-high (Left)

Setting the Filter Constant
Low-pass filter (for subwoofer/woofer):		Band-pass filter (combination of low-pass
6 dB/octave		filter and high-pass filter for mid-
L1	0dB	bass/mid): 6 dB/octave
		L2
			C2			0dB
	–6dB
						–6dB
fC	f
	2fC
			fCL	fCL	fCH	2fCH
			2

the battery.

Engine

Fuse (30 A) compart- Interior of

terminal

Speaker wire

High-pass filter (for mid/mid-high): 6 dB/octave

• A multi-channel system can be set up using a

combination of filters. The inductance (L) and

ment	the vehicle
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.

Battery wire

Connecting the Speaker Output Terminals

Speaker output

(Right) Speaker (Left)

Three-channel mode, three-way system

High/mid-high

C1 (Right)

L2	C2	Mid/mid-bass
		(Right)

C10dB

–6dB

fC f C 2

f

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-

itors rated at over ±25 V should be used for C1

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.

body.

1. Expose the end of the speaker wires

One-channel mode (mono)

L1

Woofer/subwoofer

(Mono)

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

using nippers or a cutter by about

10 mm (3/8 inch) and twist.

Twist

10 mm (3/8 inch)

2.Attach lugs to speaker wire ends. Lugs not supplied.

• Use pliers, etc., to crimp lugs to wires.

Lug

Speaker wire

White/black:	Gray/black:
Left ≠	Right ≠
White:	Gray:
Left +	Right +
	Speaker (Mono)
Speaker input connector
To speaker input terminal of
this unit.	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.

L2	C2	Mid/mid-bass
		(Left)

C1 High/mid-high

(Left)

•Inductors (L1 and L2 in the diagrams) act as low-pass filters. Capacitors (C1 and C2 in the diagrams) act as high-pass filters. Inductors (L) are used for the woofer/subwoofer, and capacitors (C) are used for 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 to 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.

Component Guide

Speaker load Impedance	2 Ω		4 Ω		8 Ω
fc (Hz)	L (mH)	C (∝F)	L (mH)	C (∝F)	L (mH)	C (∝F)
50	6.4	1,600	12.70	800.0	25.50	400.0
80	4.0	1,000	8.00	500.0	16.00	250.0
125	2.5	640	5.10	300.0	10.00	160.0
200	1.6	400	3.20	200.0	6.40	100.0
320	1.0	250	2.00	125.0	4.00	62.0
500	0.64	160	1.30	80.0	2.60	40.0
800	0.4	100	0.80	50.0	1.60	25.0
1,250	0.25	64	0.50	30.0	1.00	16.0
2,000	0.16	40	0.30	20.0	0.64	10.0
3,200	0.1	25	0.20	12.5	0.40	6.2
5,000	0.06	16	0.13	8.0	0.26	4.0
8,000	0.04	10	0.08	5.0	0.16	2.5
10,000	0.03	8	0.06	4.0	0.13	2.0