Owner's Manual

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re, emit smoke or become damaged.
DO NOT use the amplier with sub
-
woofer congurations with a com-
bined or singular nominal impedance
l
ess than 2Ω.
About the protection function
This product has a protection function. If this
product detects something abnormal, the Power/
Protect indicator will turn red and the operation
of amplifier will be stopped.
Possible causes include:
— When the temperature inside the product
becomes high
— When speaker output detects an abnormality
— When the supply voltage is out of
specification
Important (Serial number)
The serial number is located on the bottom of
this unit. Be sure to record this number on the
enclosed warranty card before installation.
Setting the unit
What’s what
Top side
1 2 3 4
5
Top panel
cover
 Use the supplied wrench to remove the four
screws and detach the top panel cover. Be
sure not to lose the removed screws.
1
2
 Use a flathead screwdriver to adjust the
switch if needed.
Right side
1 INPUT SENS switch
Select RCA for RCA level input signals or SP
for Speaker level input signals.
2 GAIN volume
If the output remains low even when the
headunit volume is turned up, turn the
volume to a lower level (clockwise). If dis
-
tortion occurs when the headunit volume is
t
urned up, turn these volumes to a higher
level (counterclockwise).
 For use with an RCA equipped stereo
(standard output of 500 mV), set to the
NOR (normal) position. For use with an
RCA equipped Pioneer headunit with
maximum output of 4 V or more, adjust
level to match that of the stereo output.
 For use with an RCA equipped headunit
with output of 4 V, set to the H (High)
position.
 If you hear too much noise when using
the speaker input terminals, turn the
gain control to higher level.
3
FREQ (Hz) (cutoff frequency)
You can select a cutoff frequency from
25 Hz to 240 Hz. For precise frequency
information, refer to
Precise Frequency
Selection Chart
.
4 BASS BOOST switch
You can select a bass boost level of 0 dB, 6
dB, or 12 dB
.
5 Power/Protect indicator
The power indicator lights blue to indicate
power ON.
 The power indicator lights red to
indicate protection mode has been
engaged.
Setting gain properly
 A protective function is included to avoid
malfunction of the unit and/or speakers
due to excessive output, improper use or
improper connection.
 When outputting high volume sound etc.,
this function may cut off the output for a
few seconds as a normal function. Output
will be restored when the volume of the
headunit is turned down.
 A cut in sound output may indicate improper
setting of the gain volume. To ensure con-
tinuous sound output with the headunit at a
h
igh volume, set the amplifier gain volume to
a level appropriate for the preout maximum
output level of the headunit, so that volume
can remain unchanged and to avoid distor
-
tion caused by signal waveform clipping at
th
e amplifier input.
 Even with correct volume and gain set-
tings, the unit sound may cut out period-
ically. In such cases, please contact an
a
uthorized Pioneer Service Company.
Gain volume of this unit
0.5 V (Maximum preout level=2 V)
Maximum preout level=4V
Above illustration shows NOR (normal) gain
setting.
Relationship between amplier gain
and headunit output power
If amplifier gain is raised improperly, this will
simply increase distortion, with little increase
in power.
Signal waveform when outputting
at high volume using amplier gain
volume
If the signal waveform is distorted due to high
output, even if the amplifier gain is raised, the
output power will change only slightly.
Precise Frequency Selection
Chart
The numbers in the illustration correspond to
the Step Number.
Step Number Frequency (Hz)
1 25
2 28
3 31.5
4 36
5 40
6 45
7 50
8 56
9 63
10 71.5
11 80
12 90
13 100
14 113
15 125
16 143
17 160
18 180
19 200
20 225
21 240
Connecting the units
Connection diagram
1
3
2
4
8
9
a
g
5
6
7
f
b
d
c
e
1 To power cable input
2 White: 
3 White/black: *
4 Speaker
5 RCA input
6 Connecting wire with RCA pin plugs (sold
separately)
7 Headunit with RCA output jacks (sold
separately)
8 Black (chassis ground)
Connect to a clean, paint-free metal location.
9 Red
a Fuse (30 A)
b Ground wire, Terminal (sold separately)
The ground wires must be the same size as
the battery wire.
c Battery wire with Fuse [more than 30A]
(sold separately)
The maximum length of the wire between
the fuse and the positive
 terminal of the
battery is 30 cm (12 in.).
d Positive  terminal
e Negative (*) terminal
f Battery (sold separately)
g System remote control wire
Before connecting the amplier
WARNING
 Secure the wiring with cable clamps or adhe-
sive tape. To protect the wiring, wrap sections
in contact with metal parts in adhesive tape.
 Never cut the insulation of the power supply
to feed power to other equipment. Current
capacity of the wire is limited.
CAUTION
 If the system remote control wire of the
amplifier is connected to the power terminal
via the ignition switch (12 V DC), the amplifier
will remain on with the ignition whether the
headunit is on or off, which may exhaust
battery if the engine is at rest or idling.
 Install and route the separately sold marine
grade battery wire, marine grade ground wire,
speaker wires and the amplifier as far away
as possible from the radio antenna, antenna
cable, tuner and any communications equip-
ment and wiring.
The point of connector
attachment/detachment
 Push in the connector until a clicking sound
is heard, confirming a secure connection.
 How to remove the connector:
(1) Insert the supplied tool into the lock part of
the connector.
(2) Gently raise the release locking tab to
separate the connector.
Note: Attempting to remove the connector
by force or pulling from the wire harness can
cause damage. To avoid injury, use a work
glove to help with gripping the tool.
2
1
Supplied tool
Work glove
- Continue to page 7/9 -
 While this amplifier is designed to be water-re-
sistant, it should never be submerged under
w
ater or subjected to high-pressure water
spray.
 Install the amplifier in a dry and well-ventilated
environment,
where other equipment will not
interfere with it.
 When drilling holes in the chassis for instal-
lation, take precautions so as not to contact,
d
amage or obstruct pipes, fuel lines, tanks or
electrical wiring. Failure to take such precau
-
tions may result in fire.
 To ensure proper heat dissipation of the
amplifier, ensure the following during
installation:
— Allow adequate space above the amplifier
for proper ventilation.
— Do not mount the amplifier in the engine
compartment or in any areas of extreme
heat.
— Do not cover the amplifier.
 Ask your dealer or installation profes
-
sional to install/uninstall this prod-
uct. Incorrect installation can create
d
angerous hazards or interfere with
boat operation.
 Keep small items such as bolts, screws and
tools out of the reach of children. Swallowing
can cause serious injury. If swallowed, con
-
sult a doctor immediately.
CAUTION
 Always keep the volume low enough to hear
outside sounds.
 Extended use of the amplifier while the
engine is at rest or idling may exhaust the
battery.
 The graphical symbol
placed on the
product means this is an electronic product
requiring direct current electrical power.
 One or more subwoofers may be connected
to this amplifier, but must meet one of the
following configurations:
— Combined or singular nominal input
power handling of 300W or greater if the
combined or singular nominal impedance
is equal to or greater than 2Ω.
WARNING: If the nominal input and
impedance are not within the above
ranges, the subwoofer(s) may catch
No.1
No.3
No.7
No.11
No.15
No.19
No.21
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