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Installation; Specifications - Pioneer GM-X944 Owner's Manual

Bridgeable four-channel power amplifier
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Connecting the Unit
Connecting the Speakers and Input wires
The speaker output mode can be four-channel, three-channel (stereo +
mono) or two-channel (stereo, mono). Connect the speaker leads to suit the
mode according to the figures shown below.
Four-channel mode
RCA Input Select Switch
For two-channel input, slide this switch to
the left. For four-channel input, slide this
switch to the right.
RCA input jack B
RCA input jack A
(Right)
Speaker out A
(Left)
+
+
Connecting wires
with RCA plugs (sold
separately)
From car stereo (RCA output)
(Left)
If only one input plug is used, such as when
Speaker out B
the car stereo has only one output (RCA out-
(Right)
put), connect the plug to RCA input jack A,
but do not connect a plug to RCA input jack B.
Three-channel mode
RCA Input Select Switch
For two-channel input, slide this switch to
the left. For four-channel input, slide this
switch to the right.
RCA input jack B
RCA input jack A
(Right)
Speaker out A
(Left)
+
+
Connecting wires
with RCA plugs (sold
separately)
Speaker out B
From car stereo (RCA output)
(Mono)
If only one input plug is used, such as when
the car stereo has only one output (RCA out-
put), connect the plug to RCA input jack A,
but do not connect a plug to RCA input jack B.
Two-channel mode (stereo)
RCA input jack A
RCA Input Select Switch
Slide this switch to the left.
Speaker (Right)
+ ≠
Connecting wire with RCA
plugs (sold separately)
From car stereo (RCA output)
Speaker (Left)
Two-channel mode (mono)
RCA input jack A
RCA Input Select Switch
Slide this switch to the left.
Speaker (Mono)
+
Connecting wire with RCA
plugs (sold separately)
From car stereo (RCA output)
Speaker (Mono)

Installation

CAUTION
Example of installation on the floor
• Do not install in:
mat or on the chassis
—Places where it could injure the driver or pas-
sengers if the vehicle stops suddenly.
—Places where it may interfere with the driver,
1. Place the amplifier where it is to be
such as on the floor in front of the driver's
installed. Insert the supplied tapping
seat.
× 18 mm) into the screw
screws (4
• Make sure that wires are not caught in the sliding
mechanism of the seats, resulting in a short-cir-
holes. Push on the screws with a
cuit.
screwdriver so they make marks
• Confirm that no parts are behind the panel when
where the installation holes are to be
drilling a hole for installation of the amplifier.
Protect all cables and important equipment such
located.
as fuel lines, brake lines and electrical wiring
from damage.
2. Drill 2.5 mm diameter holes at the
• Install tapping screws in such a way that the screw
point marked, and install the ampli-
tip does not touch any wire. This is important to
prevent wires from being cut by vibration of the
fier, either on the carpet or directly
car, which can result in fire.
to the chassis.
• To prevent electric shock, do not install the ampli-
fier in places where it might come in contact with
Tapping-screws
(4 × 18 mm)
liquids.
• To ensure proper installation, use the supplied
parts in the manner specified. If any parts other
than the supplied ones are used, they may damage
internal parts of the amplifier, or they may
become loose causing the amplifier to shut down.
To prevent malfunction
• To ensure proper heat dissipation of the amplifier,
be sure of the following during installation.
—Allow adequate space above the amplifier for
proper ventilation. Take special care not to
block the cooling fan side of the amplifier.
—Do not cover the amplifier with a floor mat or
Drill a 2.5 mm diameter hole
carpet.
• Do not install the amplifier near a door where it
may get wet.
• Do not install the amplifier on unstable places
such as the spare tire board.
• The best location for installation differs with the
car model and installation location. Secure the
amplifier at a sufficiently rigid location.
• Make temporary connections first and check that
the amplifier and the system operate properly.
• After installing the amplifier, confirm that the
spare tire, jack and tools can be easily removed.

Specifications

Power source ............................................................................................................ 14.4 V DC (10.8 — 15.1 V allowable)
Grounding system ............................................................................................................................................ Negative type
Current consumption ........................................................................................................ 43.7 A (at continuous power, 4 Ω)
Average current drawn* ........................................................................................................ 14.5 A (4 Ω for four channels)
Fuse .......................................................................................................................................................................... 30 A × 3
Dimensions ........................................................................................................................ 270 (W) × 60 (H) × 297 (D) mm
Weight ...................................................................................................................... 5.4 kg (Leads for wiring not included)
Maximum power output .................................................................................................................... 150 W × 4 / 500 W × 2
Continuous power output .......................................................... 75 W × 4 (at 14.4 V, 4 Ω, 20 — 20,000 Hz, 0.04% THD)
250 W × 2 (at 14.4 V, 4 Ω, 20 — 20,000 Hz, 0.4% THD)
125 W × 4 (at 14.4 V, 2 Ω, 20 — 20,000 Hz, 0.4% THD)
Load impedance ............................................................................................................................ 4 Ω (1 — 8 Ω allowable)
Frequency response ............................................................................................................ 10 — 50,000 Hz (+0 dB, –1 dB)
Signal-to-noise ratio ...................................................................................................................... 105 dB (IEC-A network)
Distortion ............................................................................................................................................ 0.005% (10 W, 1 kHz)
Separation ........................................................................................................................................................ 65 dB (1 kHz)
Variable crossover network
A CH: LPF-L/LPF-H/HPF-L/BPF
B CH: LPF-L/LPF-H/HPF-L/HPF-H
Cut off frequency .................................................................................................... Low frequency: 40 — 120 Hz
Cut off slope .......................................................................................................................................... –12 dB/oct
Maximum input level/impedance .................................................................................... RCA: 6.5 V/22 kΩ (0.4 — 6.5 V)
Note:
• Specifications and the design are subject to possible modification without notice
due to improvements.
*Average current drawn
• The average current drawn is nearly the maximum current drawn by this unit
Floor mat
when an audio signal is input. Use this value when working out total current
or chassis
drawn by multiple power amplifiers.
26.5 A (4 Ω for two channels)
(Bridge connection: 2 — 8 Ω allowable)
High frequency: 3k — 9k Hz

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