Pioneer GM-X944 - Manual (Page 3)

Connecting the Unit
CAUTION
• Do not install in:
—Places where it could injure the driver or pas-
sengers if the vehicle stops suddenly.
—Places where it may interfere with the driver,
such as on the floor in front of the driver’s
seat.
• Make sure that wires are not caught in the sliding
mechanism of the seats, resulting in a short-cir-
cuit.
• Confirm that no parts are behind the panel when
drilling a hole for installation of the amplifier.
Protect all cables and important equipment such
as fuel lines, brake lines and electrical wiring
from damage.
• Install tapping screws in such a way that the screw
tip does not touch any wire. This is important to
prevent wires from being cut by vibration of the
car, which can result in fire.
• To prevent electric shock, do not install the ampli-
fier in places where it might come in contact with
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
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.
Example of installation on the floor
mat or on the chassis
1. Place the amplifier where it is to be
installed. Insert the supplied tapping
screws (4
×
18 mm) into the screw
holes. Push on the screws with a
screwdriver so they make marks
where the installation holes are to be
located.
2. Drill 2.5 mm diameter holes at the
point marked, and install the ampli-
fier, either on the carpet or directly
to the chassis.
Installation
Drill a 2.5 mm diameter hole
Tapping-screws
(4
×
18 mm)
Floor mat
or chassis
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)
26.5 A (4
Ω
for two 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)
(Bridge connection: 2 — 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
High frequency: 3k — 9k Hz
Cut off slope .......................................................................................................................................... –12 dB/oct
Maximum input level/impedance .................................................................................... RCA: 6.5 V/22 k
Ω
(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
when an audio signal is input. Use this value when working out total current
drawn by multiple power amplifiers.
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
Three-channel mode
+ + ≠
≠
≠
+
+ + ≠
+ +≠ ≠
≠
Two-channel mode (stereo)
Two-channel mode (mono)
+
+ ≠
≠
+
+≠
≠
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 A
(Right)
Speaker out A
(Left)
RCA input jack B
Connecting wires
with RCA plugs (sold
separately)
From car stereo (RCA output)
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.
(Left)
Speaker out B
(Right)
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 A
(Right)
Speaker out A
(Left)
RCA input jack B
Connecting wires
with RCA plugs (sold
separately)
From car stereo (RCA output)
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.
Speaker out B
(Mono)
RCA input jack A
Speaker (Right)
Speaker (Left)
Connecting wire with RCA
plugs (sold separately)
From car stereo (RCA output)
RCA Input Select Switch
Slide this switch to the left.
RCA input jack A
Speaker (Mono)
Speaker (Mono)
Connecting wire with RCA
plugs (sold separately)
From car stereo (RCA output)
RCA Input Select Switch
Slide this switch to the left.