Boss Audio ONYX NX1600.2, ONYX NX1800.1, ONYX NX2000.2, ONYX NX2000.4, ONYX NX2500.4 User Manual
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CONTENTS
ONYX MOSFET Amplifier User’s Manual - page 1
U S E R ’ S M A N U A L
2 Introduction
2 What is included?
3 Features
3 About 2 Ohm operation
4 General precautions
4 Installation precautions
4 Mounting the amplifier
5 Connecting the amplifier
6 Low level input wiring
9 High level input wiring
11 MonoBlock Power and
Speaker wiring
12 2CH Power and Speaker wiring
2CH Mode
13 2CH Power and Speaker wiring
Bridged Mode
14 2CH Power and Speaker wiring
TriMode
15 4CH Power and Speaker wiring
4CH Mode
16 4CH Power and Speaker wiring
Bridged Mode
17 4CH Power and Speaker wiring
TriMode
18 Troubleshooting
19 Specifications
page
NX3000.2
NX2000.2
NX1600.2
Two Channel
MOSFET Car Audio
Amplifiers
NX3000.4
NX2500.4
NX2000.4
Four Channel
MOSFET Car Audio
Amplifiers
Congratulations on your
purchase of a ONYX
Amplifier.
It has been designed, engineered
and manufactured to bring you
the highest level of performance
and quality, and will afford you
years of listening pleasure.
Thank you for making
your choice for car audio
entertainment!
NX2800.1
NX1800.1
MonoBlock
MOSFET Car Audio
Amplifier
ONYX MOSFET Amplifier User’s Manual - page 2
Introduction
With the ONYX MOSFET
amplifier series, we are introducing
twelve new amplifiers, all designed in
the USA. This new series includes a
two monoblock amps, three 2-channel,
and three 4-channel amplifiers.
All ONYX models feature variable low
pass crossovers and variable input
gain controls. The two and fourchannel models also have high pass
crossovers.
For further flexibility in the use of a
subwoofer, a 0/+9dB/+18dB Bass
Boost selector has been included on
all amplifiers. You can control the
subwoofer level with the remote level
control module.
For flexibility in use in a variety of
installations, the two- and four-channel
models feature both line level (RCA)
and high level (speaker output) inputs,
and the monoblock models integrate
a line out for system building.
understands that amplifiers are
placed in many different kinds of
installations, so we incorporated a very
flexible system of controls in these
amplifiers in order to help you integrate
the amp into your system regardless
of the nature of your input source.
What is included?
When first unpacking your new
amplifier, please check first that the
package contains all of the items
below. If something is missing, contact
the store where you purchased the
amplifier.
• ONYX amplifier
•High input cable with connector
(2- and 4-channel models only)
• Remote subwoofer level control
• Four (4) mounting screws
ONYX MOSFET Amplifier User’s Manual - page 3
Features About 2 Ohm operation
Your new ONYX amplifier features the
following:
• Class A-B operation
• Bridgeable outputs
(except NX2800.1 and NX1800.1)
• Tri-Mode capable
(except NX2800.1 and NX1800.1)
• MOSFET PWM (Pulse Width
Modulated) Power Supply
• 2 Ohm stable stereo operation
with output power increase
(except NX2800.1 and NX1800.1,
which are 2 ohm mono stable)
• Thermal and speaker short
protection
• Soft turn-on circuit
• Remote turn-on/turn-off circuit
• Variable input gain control(s)
• Variable low pass crossover(s)
• Variable high pass crossover(s)
(except NX2800.1 and NX1800.1)
• Variable 0 to +18dB Bass Boost
• Chrome-plated RCA low level and
high level inputs
• LED power and protection
indicators
• Gunmetal aluminum heatsink
• Remote subwoofer level control
Your ONYX amplifier has been
designed to operate efficiently at loads
down to 2 Ohms. This means that you
can install four 8 Ohm speakers per
channel, when using parallel wiring.
Increasing the number of woofers per
channel at low frequencies (below
100Hz) produces an acoustic coupling
effect. This acoustic coupling effect
increases your power output by about
3dB per speaker, or the equivalent of
an additional 10W per speaker.
When operating at 2 Ohms, the
amplifiers will increase their output
power by approximately 50%. The
current draw will also increase by
about the same amount, so be sure
you have enough current to run the
amplifiers into a 2 Ohm load.
If you lack adequate current, your
music reproduction will be distorted.
ONYX MOSFET Amplifier User’s Manual - page 4
General precautions
SHOCK HAZARD! Do not open the case
of this product. There are dangerous
voltages present within the unit. There are
no user-serviceable parts within the unit.
Before making or breaking power
connections in your system,
disconnect the vehicle battery. Confirm
that your head unit or other equipment
is turned off while connecting the input
jacks and speaker terminals.
If you need to replace the power fuse,
replace it only with a fuse identical to
that supplied with the amplifier. Using
a fuse of a different type or rating may
result in damage to your audio system
or your amplifier which is not covered
by the manufacturer's warranty.
Before installing and using your
new amplifier, please become familiar with all the information contained in this manual.
Please keep this manual in a safe
place for future reference.
• Do not open or attempt to repair
this unit yourself. Dangerous high
voltages are present which may result
in electric shock. Refer any repairs to
a qualified service technician.
• To avoid risk of electronic shock or
damage to the amplifier, do not permit
any of this equipment to become
damp or wet from water or drinks. If
this does occur, immediately unplug
the power wires and send the amplifier
to your local dealer or service center
as soon as possible.
• If there is smoke or any peculiar
odor present during use or if there is
damage to any of the component
enclosures, immediately unplug the
power wire and send the amplifier to
your local dealer or service center as
soon as possible .
Installation precautions
Before you drill or cut any holes,
investigate your car's layout very
carefully. Take special care when you
work near the gas tank, fuel lines,
hydraulic lines and electrical wiring.
Never operate the amplifier when it is
unmounted. Attach all audio system
components securely to prevent
damage, especially in an accident.
Mounting the amplifier
1. Find a suitable location in the vehicle
in which to mount the amplifier.
2. Make sure there is sufficient air
circulation around the intended
mounting location.
3. Mark the location for the mounting
hole screws by positioning the amplifier
where you wish to install it. Use a
scribe or mounting screw, inserted
through each of the amp's mounting
holes, to mark the mounting surface.
If the mounting surface is carpeted,
measure the hole centers and mark
with a felt tip pen.
4. Drill pilot holes in the mounting
surface for the mounting screws. Place
the amplifier in position, and attach
the amplifier to the mounting surface
securely using screws.
ONYX MOSFET Amplifier User’s Manual - page 5
Before doing any wiring, look through
this manual and identify the diagrams
to follow for power, input and speaker
connections for your particular
installation. Be sure you understand
all the connections before you proceed.
1. Connect the power ground terminal
to the closest point on the chassis of
the car. Keep this ground wire to less
than 39" (100 cm) in length. Use 8
gauge (or heavier) wire.
2. Connect the remote terminal to the
remote output of the head unit using
16 gauge (or heavier) wire.
3. Connect an empty fuse holder within
18" (45 cm) of the car battery, and run
8 gauge (or heavier) cable from this
fuse to the amplifier location.
4. Check that the fuse holder is empty.
Then connect the fuse holder to the
"BATT+" connection on the amplifier.
5. If multiple amplifiers are being used
in your system, either:
• Run a separate pair of cables from
the battery and a chassis ground point
to each amplifier. Each (+) cable must
have its own inline fuse.
-or-
• Run a #4 cable from the fuse holder
at the battery to a distribution block
at or near the amplifier's location. Then
run separate cables from the amplifier
to this distribution block and to
independent chassis ground points.
6. Connect all line inputs and outputs
(if used) using high-quality cables.
Connect all speakers, following the
diagrams in this manual. Be sure to
observe proper polarity to avoid audio
phase problems.
Connecting the amplifier
7. Insert fuse(s) into the battery fuse
holder(s).
8. Recheck all connections before
powering up the amplifier.
9. Set all level controls to minimum
position, and set all crossover
controls/switches to the desired
frequency points.
10. Power up the head unit and the
amplifier. Then set the volume control
on the head unit to about 3/4 volume,
and adjust the amplifier’s input level
control(s) to just below the level of
distortion.
11. Further fine tuning of the various
controls may be necessary to obtain best
results.
Do not mistake the input level control
for a volume control! It is designed
ONLY to match the output level of
your audio source to the input level
of your amplifier.
Do not adjust this input level to
maximum unless your input level
requires it.
Ignoring these instructions will result
in an input overload to the amplifier,
and excessive audio distortion. It
can also cause the protection circuit
to engage.
Don't misuse the
level control!
ONYX MOSFET Amplifier User’s Manual - page 6 ONYX MOSFET Amplifier User’s Manual - page 13 ONYX MOSFET Amplifier User’s Manual - page 14
Low Level Input Wiring
Low-level (RCA) input wiring is preferred for best audio performance. Always use
a high-quality RCA cable for best audio performance.
NOTE: Do not connect BOTH the high level and low level inputs from your
receiver to your amplifier at the same time!
MonoBlock Amplifiers
NX1800.1
NX2800.1
To Audio
Outputs of head
unit or signal
processor
SPEAKER
+
+12V GND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
L+
L
FUSES
POWER
PROTECTION
CROSSOVER
MODE
LOW PASS
FULL RANGE
HIGH LEVEL
INPUTS
L–
R
R+
R–
GND
INPUT
LEVEL
MIN MAX
BASS
BOOST
0 +18
LOW PASS
FREQ
45Hz 90Hz
INPUT
SENSITIVITY
100mV-2V
2V-8V
Remote
Subwoofer Level Control
ONYX MOSFET Amplifier User’s Manual - page 7
Low Level Input Wiring
NOTE: Do not connect BOTH the high level and low level inputs from your
receiver to your amplifier at the same time!
2-Channel Amplifiers
NX3000.2
NX2000.2
NX1600.2
To Audio Outputs
of head unit or
signal processor
+12V G ND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
L
FUSES
POWER
PROTECTION
BASS
BOOST
0
+18
LOW PASS
FREQ
45Hz
90Hz
R
L+
HIGH LEVEL
INPUTS
L–R+R–
GND
MIN
MAX
INPUT
LEVEL
CROSSOVER
MODE
LOW PASS
HIGH
PASS
FULL RANGE
HIGH PASS
FREQ
50Hz
500Hz
INPUT
SENSITIVITY
100mV-2V
2V-8V
SPEAKER CONNECTIONS
L+R
+
BRI DGE D
Remote
Subwoofer Level Control
ONYX MOSFET Amplifier User’s Manual - page 8
Low Level Input Wiring
NOTE: Do not connect BOTH the high level and low level inputs from your
receiver to your amplifier at the same time!
NX3000.4
NX2500.4
NX2000.4
4-Channel Amplifiers
+12V GND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
FUSES
POWER
PROTECTION
HIGH LEVEL
INPUTS
GND
LOW
PASS
HIGH
PASS
FULL
LOW
PASS
HIGH
PASS
FULL
100mV-2V 2V-8V
CH
2
CH
4
CH
1
CH
3
21
CH
1
+
1
CH
2
+
1
CH
3
+
1
CH
4
+
CH1/2
CH3/4
INPUT
LEVEL
BASS
BOOST
LOW PASS
FREQ
HIGH PASS
FREQ
CROSSOVER
MODE
INPUT
SENSITIVITY
SPEAKER CONNECTIONS
CH1
+ +
BRI DGE D
CH2 CH3
+ +
BRI DGE D
CH4
45Hz
90Hz
50Hz
500Hz
0
+18
MIN
MAX
MIN
MAX0+18
45Hz
90Hz
50Hz
500Hz
100mV-2V 2V-8V
To FRONT
Audio Outputs
of head unit or
signal processor
To REAR
Audio Outputs
of head unit or
signal processor
Remote
Subwoofer Level Control
ONYX MOSFET Amplifier User’s Manual - page 9
High Level Input Wiring
NOTE: Do not connect BOTH the high level and low level inputs from your
receiver to your amplifier at the same time!
NX3000.2
NX2000.2
NX1600.2
2-Channel Amplifiers
+12V G ND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
L
FUSES
POWER
PROTECTION
BASS
BOOST
0
+18
LOW PASS
FREQ
45Hz
90Hz
R
L+
HIGH LEVEL
INPUTS
L–R+R–
GND
MIN
MAX
INPUT
LEVEL
CROSSOVER
MODE
LOW PASS
HIGH
PASS
FULL RANGE
HIGH PASS
FREQ
50Hz
500Hz
INPUT
SENSITIVITY
100mV-2V
2V-8V
SPEAKER CONNECTIONS
L+R
+
BRI DGE D
Remote
Subwoofer Level Control
R+L+
R-L-
NOTE: Do not connect BOTH the high level and low level inputs from your
receiver to your amplifier at the same time!
4-Channel Amplifiers
NX3000.4
NX2500.4
NX2000.4
+12V G ND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
FUSES
POWER
PROTECTION
HIGH LEVEL
INPUTS
GND
LOW
PASS
HIGH
PASS
FULL
LOW
PASS
HIGH
PASS
FULL
100mV-2V 2V-8V
CH
2
CH
4
CH
1
CH
3
21
CH
1
+
1
CH
2
+
1
CH
3
+
1
CH
4
+
CH1/2
CH3/4
INPUT
LEVEL
BASS
BOOST
LOW PASS
FREQ
HIGH PASS
FREQ
CROSSOVER
MODE
INPUT
SENSITIVITY
SPEAKER CONNECTIONS
CH1
+ +
BRI DGE D
CH2 CH3
+ +
BRI DGE D
CH4
45Hz
90Hz
50Hz
500Hz
0
+18
MIN
MAX
MIN
MAX0+18
45Hz
90Hz
50Hz
500Hz
100mV-2V 2V-8V
To Speaker Terminals
of head unit
To Speaker Terminals
of head unit
Remote
Subwoofer Level Control
CH2
+
+
CH1
CH3
+
CH4
HIGH LEVEL
INPUTS
GND
21
CH
1
+
1
CH
2
+
1
CH
3
+
1
CH
4
+
ONYX MOSFET Amplifier User’s Manual - page 11ONYX MOSFET Amplifier User’s Manual - page 10
MonoBlock
MonoBlock Amplifiers
NX1800.1
NX2800.1
SPEAKER
+
+12V G ND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
L+
L
FUSES
POWER
PROTECTION
CROSSOVER
MODE
LOW PASS
FULL RANGE
HIGH LEVEL
INPUTS
L–
R
R+
R–
GND
INPUT
LEVEL
MIN MAX
BASS
BOOST
0 +18
LOW PASS
FREQ
45Hz 90Hz
INPUT
SENSITIVITY
100mV-2V
2V-8V
SPEAKER
IMPEDANCE
2-8 OHMS
to REMOTE
TURN-ON
terminal of
head unit
Chassis
ground
point
Battery
FUSE
Loudspeaker
ONYX MOSFET Amplifier User’s Manual - page 12
Power and Speaker Wiring
2 Channel
2-Channel Amplifiers
NX3000.2
NX2000.2
NX1600.2
+12V GND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
L
FUSES
POWER
PROTECTION
BASS
BOOST
0
+18
LOW PASS
FREQ
45Hz
90Hz
R
L+
HIGH LEVEL
INPUTS
L–R+R–
GND
MIN
MAX
INPUT
LEVEL
CROSSOVER
MODE
LOW PASS
HIGH
PASS
FULL RANGE
HIGH PASS
FREQ
50Hz
500Hz
INPUT
SENSITIVITY
100mV-2V
2V-8V
SPEAKER CONNECTIONS
L+R
+
BRI DGE D
Two
Channel
Mode
SPEAKER
IMPEDANCE
2-8 OHMS
to REMOTE
TURN-ON
terminal of
head unit
Chassis
ground
point
Battery
FUSE
RIGHT
Speaker
LEFT
Speaker
Power and Speaker Wiring
Bridged Mode
2-Channel Amplifiers
NX3000.2
NX2000.2
NX1600.2
+12V GND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
L
FUSES
POWER
PROTECTION
BASS
BOOST
0
+18
LOW PASS
FREQ
45Hz
90Hz
R
L+
HIGH LEVEL
INPUTS
L–R+R–
GND
MIN
MAX
INPUT
LEVEL
CROSSOVER
MODE
LOW PASS
HIGH
PASS
FULL RANGE
HIGH PASS
FREQ
50Hz
500Hz
INPUT
SENSITIVITY
100mV-2V
2V-8V
SPEAKER CONNECTIONS
L+R
+
BRI DGE D
Connect the Positive (+) terminal of the
subwoofer to the L (+) amplifier terminal.
Connect the Negative (-) terminal of the
subwoofer to the R (-) amplifier terminal.
Bridged
Mode
SPEAKER
IMPEDANCE
4-8 OHMS
to REMOTE
TURN-ON
terminal of
head unit
Chassis
ground
point
Battery
FUSE
Subwoofer
Power and Speaker Wiring
Tri-Mode
Tri-Mode
Tri-mode operation allows you to connect this amplifier to a pair of main speakers
plus a subwoofer on one pair of output channels. The main speakers will operate
in STEREO while the subwoofer simultaneously operates in MONO.
To set up the amplifier to run in this mode, put the crossover switches in the
FULL position. Insert high pass filter capacitors and a low pass filter inductor
into the wiring as shown below. Be sure to check the table at the bottom of this
page to determine the correct capacitor and inductor values for the crossover
frequency you wish to achieve.
2-Channel Amplifiers
NX3000.2
NX2000.2
NX1600.2
+12V G ND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
L
FUSES
POWER
PROTECTION
BASS
BOOST
0
+18
LOW PASS
FREQ
45Hz
90Hz
R
L+
HIGH LEVEL
INPUTS
L–R+R–
GND
MIN
MAX
INPUT
LEVEL
CROSSOVER
MODE
LOW PASS
HIGH
PASS
FULL RANGE
HIGH PASS
FREQ
50Hz
500Hz
INPUT
SENSITIVITY
100mV-2V
2V-8V
SPEAKER CONNECTIONS
L+R
+
BRI DGE D
Component values for
6dB Passive Crossover
FREQUENCY INDUCTOR CAPACITOR
80 Hz
100 Hz
120 Hz
150 Hz
7.5mH
6.5mH
5.5mH
4mH
470uF
330uF
330uF
220uF
to REMOTE
TURN-ON
terminal of
head unit
Chassis
ground
point
Battery
FUSE
RIGHT
Speaker
LEFT
Speaker
Subwoofer
SPEAKER
IMPEDANCE
8 OHMS
–
Low pass
filter inductor
High pass filter
crossover
MINIMUM
SPEAKER
IMPEDANCE
4 OHMS
High pass filter
crossover
ONYX MOSFET Amplifier User’s Manual - page 15
Power and Speaker Wiring
4 Channel Mode
NX3000.4
NX2500.4
NX2000.4
4-Channel Amplifiers
+12V GND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
FUSES
POWER
PROTECTION
HIGH LEVEL
INPUTS
GND
LOW
PASS
HIGH
PASS
FULL
LOW
PASS
HIGH
PASS
FULL
100mV-2V 2V-8V
CH
2
CH
4
CH
1
CH
3
21
CH
1
+
1
CH
2
+
1
CH
3
+
1
CH
4
+
CH1/2
CH3/4
INPUT
LEVEL
BASS
BOOST
LOW PASS
FREQ
HIGH PASS
FREQ
CROSSOVER
MODE
INPUT
SENSITIVITY
SPEAKER CONNECTIONS
CH1
+ +
BRI DGE D
CH2 CH3
+ +
BRI DGE D
CH4
45Hz
90Hz
50Hz
500Hz
0
+18
MIN
MAX
MIN
MAX0+18
45Hz
90Hz
50Hz
500Hz
100mV-2V 2V-8V
Four Channel Mode
SPEAKER
IMPEDANCE
2-8 OHMS
SPEAKER
IMPEDANCE
2-8 OHMS
to REMOTE
TURN-ON
terminal of
head unit
Chassis
ground
point
Battery
FUSE
CH4
Speaker
CH3
Speaker
CH2
Speaker
CH1
Speaker
ONYX MOSFET Amplifier User’s Manual - page 16
Power and Speaker Wiring
Bridged Mode
NX3000.4
NX2500.4
NX2000.4
4-Channel Amplifiers
+12V GND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
FUSES
POWER
PROTECTION
HIGH LEVEL
INPUTS
GND
LOW
PASS
HIGH
PASS
FULL
LOW
PASS
HIGH
PASS
FULL
100mV-2V 2V-8V
CH
2
CH
4
CH
1
CH
3
21
CH
1
+
1
CH
2
+
1
CH
3
+
1
CH
4
+
CH1/2
CH3/4
INPUT
LEVEL
BASS
BOOST
LOW PASS
FREQ
HIGH PASS
FREQ
CROSSOVER
MODE
INPUT
SENSITIVITY
SPEAKER CONNECTIONS
CH1
+ +
BRI DGE D
CH2 CH3
+ +
BRI DGE D
CH4
45Hz
90Hz
50Hz
500Hz
0
+18
MIN
MAX
MIN
MAX0+18
45Hz
90Hz
50Hz
500Hz
100mV-2V 2V-8V
Bridged Mode
Connect the Postive (+) terminal of the RIGHT
subwoofer to the CH3(+) amplifier terminal.
Connect the Negative (-) terminal of the RIGHT
subwoofer to the CH4(-) amplifier terminal.
Connect the Postive (+) terminal of the LEFT
subwoofer to the CH1(+) amplifier terminal.
Connect the Negative (-) terminal of the LEFT
subwoofer to the CH2(-) amplifier terminal.
SPEAKER
IMPEDANCE
4-8 OHMS
SPEAKER
IMPEDANCE
4-8 OHMS
to REMOTE
TURN-ON
terminal of
head unit
Chassis
ground
point
Battery
FUSE
LEFT
Subwoofer
RIGHT
Subwoofer
ONYX MOSFET Amplifier User’s Manual - page 17
Tri-Mode
Power and Speaker Wiring
Tri-Mode
Tri-mode operation allows you to connect this amplifier to a pair of main speakers
plus a subwoofer on one pair of output channels. The main speakers will operate
in STEREO while the subwoofer simultaneously operates in MONO.
To set up the amplifier to run in this mode, put the crossover switches in the
FULL position. Insert high pass filter capacitors and a low pass filter inductor
into the wiring as shown below. Be sure to check the table at the bottom of this
page to determine the correct capacitor and inductor values for the crossover
frequency you wish to achieve.
NX3000.4
NX2500.4
NX2000.4
4-Channel Amplifiers
+12V G ND REM
POWER CONNECTIONS
SUBWOOFER
LEVEL
CONTROL
INPUTS
FUSES
POWER
PROTECTION
HIGH LEVEL
INPUTS
GND
LOW
PASS
HIGH
PASS
FULL
LOW
PASS
HIGH
PASS
FULL
100mV-2V 2V-8V
CH
2
CH
4
CH
1
CH
3
2
1
CH
1
+
1
CH
2
+
1
CH
3
+
1
CH
4
+
CH1/2
CH3/4
INPUT
LEVEL
BASS
BOOST
LOW PASS
FREQ
HIGH PASS
FREQ
CROSSOVER
MODE
INPUT
SENSITIVITY
SPEAKER CONNECTIONS
CH1
+ +
BRI DGE D
CH2 CH3
+ +
BRI DGE D
CH4
45Hz
90Hz
50Hz
500Hz
0
+18
MIN
MAX
MIN
MAX0+18
45Hz
90Hz
50Hz
500Hz
100mV-2V 2V-8V
Battery
Component values for
6dB Passive Crossover
FREQUENCY INDUCTOR CAPACITOR
80 Hz
100 Hz
120 Hz
150 Hz
7.5mH
6.5mH
5.5mH
4mH
470uF
330uF
330uF
220uF
SPEAKER
IMPEDANCE
8 OHMS
to REMOTE
TURN-ON
terminal of
head unit
Chassis
ground
point
FUSE
CH3
Speaker
RIGHT
Subwoofer
SPEAKER
IMPEDANCE
8 OHMS
MINIMUM
SPEAKER
IMPEDANCE
4 OHMS
Low pass
filter inductor
High pass filter
crossover
High pass
filter crossover
CH4
Speaker
CH2
Speaker
CH1
Speaker
LEFT
Subwoofer
+
–
+
–
High pass filter
crossover
Low pass
filter inductor
High pass filter
crossover
MINIMUM
SPEAKER
IMPEDANCE
4 OHMS
Troubleshooting
ONYX MOSFET Amplifier User’s Manual - page 18
If you experience operation or performance problems with this product, compare your
installation with the electrical wiring diagram on the previous pages. If problems persist,
read the following troubleshooting tips which may help eliminate the problems.
Amplifier will not
power up.
Check to make sure you have a good ground connection.
Check that the Remote Input (Turn-On) has at least 3VDC.
Check that there is battery power on the (+) terminal.
Check that there is at least 12v.
Check all fuses, replace if necessary.
Make sure that the Protection LED is not illuminated. If it is lit, shut off
the amplifier briefly, and then repower it.
Protection LED
comes on when
amplifier is
powered up.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving.
Remove speaker leads, and reset the amplifier. If the Protection LED still
comes on, then the amplifier is faulty and needs servicing.
No output.
Check that all fuses are OK.
Check that amplifier is properly grounded.
Check that the Remote Input (Turn-On) has at least 3VDC.
Check that the RCA audio cables are plugged into the proper inputs.
Check all speaker wiring.
Low output.
Reset the Level Control.
Check the Crossover Control settings.
Audio present in
only one channel.
Check the RCA interconnect cables.
Check all speaker wiring.
High hiss in the
speakers.
Disconnect all RCA inputs to the amplifiers. If the hiss disappears, then
plug in the component driving the amplifier and unplug its inputs. If the
hiss disappears at this point, go on until the faulty/noisy component is
found.
It is best to set the amplifier's input level control as low as possible. The
best subjective signal-to-noise ratio is achieved in this manner. Try to set
the head unit as high as possible (without distortion) and the amp input
level as low as possible.
Squealing noise
from speakers.
Check for improperly grounded RCA interconnects.
Distorted sound.
Check that the Input Level Control is set to match the signal level of the
head unit. Always try to set the Input Level as low as possible.
Check that all crossover frequencies are properly set.
Check for short circuits on the speaker leads.
Amplifier gets
very hot.
Check that the minimum speaker impedance for the amp model is correct.
Check that there is good air circulation around the amp. In some
applications, it may be necessary to add external cooling fan(s).
Engine noise
(static type)
This is usually caused by poor quality RCA cables,which can pick up
radiated noise. Use only the best quality cables, and route them away
from power cables.
Engine noise
(alternator
whine)
Check that speaker leads are not shorted to the vehicle chassis.
Check that the RCA grounds are not shorted to the vehicle chassis.
Check that the head unit is properly grounded.
SYMPTOM POSSIBLE REMEDY
ONYX MOSFET Amplifier User’s Manual - page 19
Specifications Notes
All specifications subject to change without notice.
RMS POWER
into 4 Ohms
MAX POWER
into 2 Ohms
BRIDGED POWER
into 4 Ohms
Min. speaker
impedance
THD
Frequency response
Signal-to-noise ratio
Channel separation
Damping factor
Crossover range
low pass
high pass
Bass boost
Fuse rating
Dimensions:
(10" x 2
-3/16
" x ...)
MODEL
4-C ha nne l M OSF ET Am pli fi ers
250W x 4
625W X 4
1250W x 2
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
9Hz-50kHz
103dB
90dB
125+
35Hz-160Hz
200Hz (fixed)
Variable 0 - +18dB
30A x 2
18-5/16"
NX2500.4
RMS POWER
into 4 Ohms
MAX POWER
into 2 Ohms
BRIDGED POWER
into 4 Ohms
Min. speaker
impedance
THD
Frequency response
Signal-to-noise ratio
Channel separation
Damping factor
Crossover range
low pass
high pass
Bass boost
Fuse rating
Dimensions:
(10" x 2
-3/16
" x ...)
MODEL
2-C ha nne l M OSF ET Am pli fi ers
500W x 2
1000W X 2
2000W x 1
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
9Hz-50kHz
103dB
90dB
125+
35Hz-160Hz
200Hz (fixed)
Variable 0 - +18dB
15 A x 2
15-13/16"
NX2000.2
700W x 2
1500W X 2
3000W x 1
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
9Hz-50kHz
103dB
90dB
125+
35Hz-160Hz
200Hz (fixed)
Variable 0 - +18dB
30A x 2
22"
NX3000.2
300W x 4
750W X 4
1500W x 2
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
9Hz-50kHz
103dB
90dB
125+
35Hz-160Hz
200Hz (fixed)
Variable 0 - +18dB
25A x 3
23-1/2"
NX3000.4
1500W x 1
2800W X 1
n/a
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
15-250Hz
100dB
90dB
125+
35Hz-160Hz
n/a
Variable 0 - +18dB
25A x 2
15-1/8"
900W x 1
1800W X 1
n/a
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
15-250Hz
100dB
125+
35Hz-160Hz
n/aVa\
riable 0 - +18dB
25A
11-3/4"
NX1800.1
Mon oBloc k M OSF ET Am pli fie rs
NX2800.1
NX1600.2
400W x 2
800W X 2
1600W X 1
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
20Hz-22kHz
102dB
90dB
125+
30Hz-160Hz
50Hz-1kHz
Variable 0 to +18dB
25A
12-7/8"
NX2000.4
200W x 4
500W X 4
1000W X 2
2 Ohm Stereo
4 Ohm Mono Bridged
0.01%
20Hz-22kHz
102dB
90dB
125+
45Hz-90Hz
50Hz-500Hz
Variable 0 to +18dB
25A x 2
15-5/8"
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