A2150
two-channel full-range amplifier
OWNER’S MANUAL
Thank you for purchasing a JL Audio amplifier for
your automotive sound system.
Your amplifier has been designed and manufactured to exacting
standards in order to ensure years of musical enjoyment in your vehicle.
For maximum performance and extended warranty
coverage, we highly recommend that you have your new amplifier
installed by an authorized JL Audio dealer. Your authorized
dealer has the training, expertise and installation equipment to ensure
optimum performance from this product. Should you
decide to install the amplifier yourself, please take the time
to read this manual thoroughly so as to familiarize yourself
with its installation requirements and setup procedures.
If you have any questions regarding the instructions in this
manual or any aspect of your amplifier’s operation, please contact your
authorized JL Audio dealer for assistance. If you need further assistance,
please call the JL Audio Technical Support Department
at (954) 443-1100 during business hours.
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PROTECT YOUR HEARING!
INSTALLATION APPLICATIONS
PLANNING YOUR INSTALLATION
We value you as a long-term customer. For
that reason, we urge you to practice restraint in
the operation of this product so as not to damage
your hearing and that of others in your vehicle.
Studies have shown that continuous exposure to
high sound pressure levels can lead to permanent
(irreparable) hearing loss. This and all other
high-power amplifiers are capable of producing
such high sound pressure levels when connected
to a speaker system. Please limit your continuous
exposure to high volume levels.
This amplifier is designed for operation in
vehicles with 12 volt, negative-ground electrical
systems. Use of this product in vehicles with
positive ground and/or voltages other than 12V
may result in damage to the product and will void
the warranty.
This product is not certified or approved for
use in aircraft.
Do not attempt to “bridge” the outputs of this
amplifier with the outputs of a second amplifier,
including an identical one.
It is important that you take the time to read
this manual and that you plan out your
installation carefully. The following are some
considerations that you must take into account
when planning your installation.
Mounting the amplifier upside down is
strongly discouraged.
If mounting the amplifier under a seat,
make sure there is at least 1 inch (2.5 cm) of
space above the amplifier’s outer shell to permit
proper cooling.
Cooling Efficiency Considerations:
The outer shell of your JL Audio amplifier
is designed to remove heat from the amplifier
circuitry. For optimum cooling performance,
this outer shell should be exposed to as large a
volume of air as possible. Enclosing the amplifier
in a small, poorly ventilated chamber can
lead to excessive heat build-up and degraded
performance. If an installation calls for an
enclosure around the amplifier, we recommend
that this enclosure be ventilated with the aid
of a fan. In normal applications, fan-cooling
is not necessary.
Safety Considerations:
Your amplifier needs to be installed in a dry,
well-ventilated environment and in a manner
which does not interfere with your vehicle’s safety
equipment (air bags, seat belt systems, ABS brake
systems, etc.). You should also take the time to
securely mount the amplifier using the supplied
screws so that it does not come loose in the event
of a collision or a sudden jolt to the vehicle.
While driving, operate your audio system in
a manner that still allows you to hear necessary
noises to operate your vehicle safely (horns,
sirens, etc.).
SERIAL NUMBER
In the event that your amplifier requires
service or is ever stolen, you will need to have
a record of the product’s serial number. Please
take the time to enter that number in the space
provided below. The serial number can be found
on the bottom panel of the amplifier and on the
amplifier packaging.
Stupid Mistakes to Avoid
Chassis Ground
Connector
(pg. 5)
• Check before drilling any holes in your vehicle
to make sure that you will not be drilling
through a gas tank, brake line, wiring harness or
other vital vehicle system.
Speaker Outputs
(pg. 8)
+12 V Power
Connector
(pg. 5)
Remote Turn-On
Connector
(pg. 6)
• Do not run system wiring outside or underneath
the vehicle. This is an extremely dangerous
practice which can result in severe damage to
your vehicle and person.
Serial Number:
• Protect all system wires from sharp metal
edges and wear by carefully routing them,
tying them down and using grommets and
loom where appropriate.
Input Voltage
Selection
(pg. 6)
Left & Right
Preamp Output Jacks
(pg. 8)
Protection Status
Indicator
Bass EQ
On/Off Switch
(pg. 8)
Filter Mode
Selection
(pg. 7)
(pg. 9)
Jack for
Left & Right
Preamp Input Jacks
(pg. 6)
Power Status
Indicator
(pg. 9)
Remote Bass
Control Knob
(pg. 8)
Input Sensitivity
Control
(pg. 6)
Filter
Frequency Selector
(pg. 7)
• Do not mount the amplifier in the engine
compartment, under the vehicle, on the roof
or in any other area that will expose the
amplifier circuitry to the elements.
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JL AUDIO A2150
JL AUDIO A2150
3
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PRODUCT DESCRIPTION
The JL Audio A2150 is a two-channel
full-range audio amplifier utilizing patented
Absolute Symmetry™ Class A/B technology for
both channels.
The A2150 can be operated with a wide variety
of source units and system configurations.
(90 cm) from the amplifier to the ground
connection point. In some vehicles, it may be
necessary to upgrade the battery ground wire.
(See page 5 for important notice).
7) Securely mount the amplifier using the
supplied screws.
8) Connect the positive and negative power
wires to the amplifier. A fuse near the
amplifier is not necessary.
The A2150’s “+12VDC” and “Ground”
connections are designed to accept 8 AWG -
4 AWG power wire. 8 AWG is a minimum power
wire size for this amplifier.
If you are installing the A2150 with other
amplifiers and wish to use a single main power
wire, use 4 AWG or larger main power wire
(depending on the overall current demands of all
the amplifiers in the system). This 4 AWG or
larger power wire should terminate into a
distribution block mounted as close to the
amplifiers as possible and should connect to the
A2150 with 8 AWG - 4 AWG power wire.
Many vehicles employ small (10 AWG -
6 AWG) wire to ground the battery to the
vehicle chassis and to connect the alternator’s
positive connection to the battery. To prevent
voltage drops, these wires should be upgraded
to 4 AWG when installing amplifier systems
with main fuse ratings above 60A.
TYPICAL INSTALLATION SEQUENCE
The following represents the sequence
for a typical amplifier installation, using an
aftermarket source unit or OEM Interface
processor (like the CleanSweep CL441dsp).
Additional steps and different procedures may
be required in some applications. If you have
any questions, please contact your authorized
JL Audio dealer for assistance.
FUSE REQUIREMENTS
9) Connect the remote turn-on wire
to the amplifier.
It is absolutely vital that the main power
wire(s) to the amplifier(s) in the system be
fused within 18 inches (45 cm) of the positive
battery post connection. The fuse value at each
power wire should be high enough for all of the
equipment being run from that power wire. If
only the A2150 is being run from that power wire,
we recommend a 20A fuse be used. AFS (mini
blade fuse), AGU (big glass fuse) or MaxiFuse™
(big plastic-body fuse) types are recommended.
No fuse is required or recommended directly
before the amplifier power connection. If one is
desired, we recommend the use of a 20A.
10) Connect the input cables to the amplifier.
11) Connect the speaker cables to the amplifier.
12) Carefully review the amplifier’s control
settings to make sure that they are set
according to the needs of the system.
13) Install the power wire fuse (20A for a
single A2150) and reconnect the negative
battery post terminal.
14) Turn on the source unit at a low level
to double-check that the amplifier is
configured correctly. Resist the temptation
to crank it up until you have verified the
control settings.
15) Make necessary adjustments to the input
sensitivity controls to obtain the right
overall output and the desired balance
in the system. See Appendix A (page 12)
for the recommended input sensitivity
setting method.
Note: that smaller AWG numbers mean bigger
wire and vice-versa (1/0 AWG is the largest, 2
AWG is smaller, then 4 AWG, then
8 AWG, etc.).
1) Disconnect the negative battery post
connection and secure the disconnected cable
to prevent accidental re-connection during
installation. This step is not optional.
2) Run power wire (minimum 8 AWG) from the
battery location to the amplifier mounting
location, taking care to route it in such a
way that it will not be damaged and will not
interfere with vehicle operation. Use 4 AWG
or larger power wire and a power distribution
block if additional amplifiers are being
installed with the A2150.
3) Connect power wire to the positive battery
post. Fuse the wire with an appropriate fuse
block (and connectors) within 18 inches (45
cm) wire length of the positive battery post.
This fuse is essential to protect the vehicle.
Do not install the fuse until the power wire
has been securely connected to the amplifier.
4) Run signal cables and remote turn-on wire
from the source unit to the final amplifier
mounting location.
5) Run speaker cables from the speaker systems
to the amplifier mounting location.
6) Find a good, solid metal grounding point
close to the amplifier and connect the
negative power wire to it using appropriate
hardware (use of the JL Audio ECS master
ground lug, XA-MGL-1 is recommended).
Use the same size power wire as the wire
connected to the “+12VDC” connection
(minimum 8 AWG), no longer than 36 inches
To connect the power wires to the amplifier,
first back out the set screw on the top of the
terminal block, using the supplied 2.5 mm hex
wrench. Strip 1/2 inch (12 mm) of insulation from
the end of each wire and insert the bare wire into
the terminal block, seating it firmly so that no
bare wire is exposed. While holding the wire in
place, tighten the set screw firmly, taking care not
to strip the head of the screw.
The ground connection should be made using
the same gauge wire as the power connection
and should be kept as short as possible, while
accessing a solid piece of sheet metal in the
vehicle. The surface of the sheet metal should
be sanded at the contact point to create a clean,
metal-to-metal connection between the chassis
and the termination of the ground wire. For
optimal grounding, we recommend the use of a
JL Audio ECS master ground lug (XA-MGL-1).
Alternatively, a sheet metal screw or bolt can be
used with a star washer.
TURN-ON LEAD
The A2150 uses a conventional +12V remote
turn-on lead, typically controlled by the source
unit’s remote turn-on output. The amplifier will
turn on when +12V is present at its “Remote”
input and turn off when +12V is switched off.
If a source unit does not have a dedicated remote
turn-on output, the amplifier’s turn-on lead can
be connected to +12V via a switch that derives
power from an ignition-switched circuit.
The A2150’s “Remote” turn-on connector is
designed to accept 18 AWG – 12 AWG wire. To
connect the remote turn-on wire to the amplifier,
first back out the set screw on the top of the
terminal block, using the supplied 2.5mm hex
wrench. Strip 1/2 inch (12mm) of wire and insert
the bare wire into the terminal block, seating it
firmly so that no bare wire is exposed. While
holding the wire in the terminal, tighten the set
screw firmly, taking care not to strip the head
of the screw and making sure that the wire (not
the insulation) is firmly gripped by the set screw.
16) Enjoy the fruits of your labor with your
favorite music.
POWER CONNECTIONS
Before installing the amplifier, disconnect the
negative (ground) wire from the vehicle’s battery.
This will prevent accidental damage to the system,
the vehicle and your body during installation.
Any wires run through metal barriers (such
as firewalls), must be protected with a high
quality rubber grommet to prevent damage to the
insulation of the wire. Failure to do so may result
in a dangerous short circuit.
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JL AUDIO A2150
JL AUDIO A2150
5
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INPUT SECTION
FILTER CONTROLS
The A2150’s input section allows you to send
signal to the amplifier section through the use
of two differential-balanced inputs, one for
the left channel and one for the right channel.
Connection is via RCA-type jacks.
The output of the amplifier will decrease for
a given input voltage when the “Input Range”
switch is placed in the “High” position.
Conversely, the output will be higher with the
switch in the “Low” position. While this may
sound counter-intuitive, it is consistent with the
descriptions above.
Most speakers are not designed to reproduce
the full range of frequencies audible by the
human ear. For this reason, most speaker
systems are comprised of multiple speakers, each
dedicated to reproducing a specific frequency
range. Filters are used to select which frequency
range is sent to each section of a speaker system.
The division of frequency ranges to different
speakers can be done with passive filters (coils
and/or capacitors between the amplifier outputs
and the speakers), which are acceptable and
commonly used for filtering between mid-
range speakers and tweeters. Filtering between
subwoofer systems and satellite speaker systems
is best done with active filters, which cut off
frequency content at the input to the amplifier.
Active filters are more stable than passive filters
and do not introduce extraneous resistance,
which can degrade subwoofer performance.
The active filter built into the A2150 can be
used to eliminate potentially harmful and/or
undesired frequencies from making their way
through the amplifier sections to the speaker(s).
This serves to improve tonal balance and to avoid
distortion and possible speaker failure. Correct
use of these filters can substantially increase the
longevity and fidelity of your audio system.
1) “Filter Mode” Control: The A2150 employs a
12dB per octave filter which can be configured
into one of two filter types or defeated
completely by way of the three-position “Filter
Mode” switch:
“Off”: Defeats the filter completely, allowing
the full range of frequencies present at the
inputs to feed the amplifier. This is useful
for systems utilizing outboard crossovers or
requiring full-range reproduction from the
A2150’s channels.
“LP” (Low-Pass): Configures the filter to
attenuate frequencies above the selected filter
frequency at a rate of 12dB per octave. This is
useful for connection of subwoofer(s) to the
A2150’s in a bi-amplified system.
“HP” (High-Pass): Configures the filter to
attenuate frequencies below the selected filter
frequency at a rate of 12dB per octave. This is
useful for connection of component speakers to
the A2150’s channels in a bi-amplified system.
INPUT SENSITIVITY CONTROL
Once the appropriate “Input Voltage” range
has been selected, the control labeled “Input
Sens.” located in the “Amplifier Controls”
section can be used to match the source unit’s
output voltage to the input stage of the amplifier
for maximum clean output. Rotating the control
clockwise will result in higher sensitivity (louder
for a given input voltage). Rotating the control
counter-clockwise will result in lower sensitivity
(quieter for a given input voltage.)
Input Voltage Range:
A wide range of signal input voltages can be
accommodated by the A2150’s input section
(200mV – 8V). This wide range is split up into
two sub-ranges, accessible via a switch located to
the left of the Input Connectors.
The “Low” position on the “Input Voltage”
switch selects an input sensitivity range between
200mV and 2V. This means that the “Input
Sens.” rotary control will operate within that
voltage window. If you are using an aftermarket
source unit or an OEM interface processor with
conventional preamp-level outputs, this is most
likely the position that you will use.
2) “Filter Freq. (Hz)” The filter frequency
markings surrounding this rotary control
are for reference purposes and are generally
accurate to within 1/3 octave or better. If you
would like to select the filter cutoff frequency
with a higher level of precision, consult the
chart in Appendix B (page 13).
Tuning Hint: If you are using the A2150 to drive
a subwoofer system (“LP” mode), a component
satellite speaker system (“HP” mode) or both,
80 Hz is a good baseline “Filter Freq. (Hz)”
setting. After properly adjusting the “Input
Sens.”, as outlined in Appendix A (page 12), you
can fine tune the “Filter Freq. (Hz)” control to
achieve the desired system frequency response.
The “High” position on the “Input Voltage”
switch selects an input sensitivity range between
800mV and 8V. This is useful for certain high-
output preamp level signals as well as speaker-
level output from source units and
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page
12) in this manual. After using this procedure,
you can then adjust any or all “Input Sens.”
levels downward if this is required to achieve the
desired system balance.
small amplifiers.
To use speaker-level sources, splice the speaker
output wires of the source unit or small amplifier
onto a pair of RCA plugs. No line output
converter is needed in most cases.
Do not increase any “Input Sens.” setting for
any channel(s) of any amplifier in the system
beyond the maximum level established during
the procedure outlined in Appendix A (page
12). Doing so will result in audible distortion
and possible speaker damage.
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JL AUDIO A2150
JL AUDIO A2150
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BASS BOOST CONTROLS
SPEAKER OUTPUTS
The A2150’s speaker outputs are designed to
accept 16 AWG - 8 AWG wire.
The A2150 is designed to deliver power into
speaker loads equal to or greater than 2 ohms
when using a “stereo” configuration and speaker
loads equal to or greater than 4 ohms when using
a “bridged” configuration.
AMPLIFIER STATUS INDICATOR LIGHTS &
PROTECTION CIRCUITRY
There are two status indicator lights on the
input / control end of the amplifier.
When a pair of channels are bridged, they
will deliver 150W x 1 into a 4 ohm load or
90W x 1 into an 8 ohm load. Operating a
pair of bridged channels into a load lower
than 4 ohms is not recommended.
Because a bridged pair of channels requires
that both channels receive input, you need to
connect both left and right inputs to the source
unit. Connection of only one input will result in
reduced power output, increased distortion and
can cause the amplifier to overheat.
1) “Bass Boost”: This switch allows the user to
activate a 6 dB boost centered at 48 Hz.
When the “Bass Boost” is activated, the inputs
to “CH 1 (Left)” and “CH 2 (Right)” are
summed to create a mono signal. The “Filter
Mode” switch in the “Channel 1 & 2” section
must be in the “LP” position for the bass boost
to be functional.
Do not do this!
When the A2150 operating in bridged mode,
the output will be in mono (only one channel).
This mono channel can contain right channel
only information, left channel only information
or the sum of the information from both the
right and left channels. In order to achieve one of
these options, configure the inputs to that pair of
channels in one of these two ways:
1) “Power” (Green): lights to indicate that the
amplifier is turned on and operating normally.
2) “Protect” (Red): Indicates that the amplifier
protection circuitry has been activated to
prevent product failure due to a short-circuit
or a dangerously low impedance connected
to the amplifier output(s). Connecting the
speaker outputs to an impedance lower than
2 ohms stereo (4 ohms bridged) will cause
this protection mode to activate. When this
protection mode is activated, the amplifier will
reduce it maximum power output to protect its
circuitry, which will manifest itself as increased
distortion. When the problem is corrected, the
amplifier will return to normal operation.
2) “ Remote Bass Port”: This port allows you to
connect an optional remote boost knob (sold
separately as JL Audio Model RBC-1) that can
be mounted in the front of the vehicle. With
the RBC-1 connected, the boost is no longer
limited to 0 or +6 dB, allowing a variable
range of 0 to +12 dB of boost to be selected.
Speaker loads below 2 ohms nominal per
channel in stereo or below 4 ohms nominal
bridged mono are not recommended and may
cause the amplifier to initiate a protection
mode which reduces power output.
1) Left Channel Only or Right Channel Only
Information: If you wish to send a left-only or
right-only signal the A2150, use a “Y-Adaptor”
to split the single channel signal into both left
and right RCA inputs. This option is useful
when using one A2150 to drive left channel
speakers only and the other A2150’s channels
to drive right channel speakers only.
BRIDGING CONSIDERATIONS
PRE-OUTS
Bridging is the practice of combining the
output of two amplifier channels to drive a single
load. When bridged, each channel produces
signals of equal magnitude, but opposite polarity.
The combined output of the two channels
provides twice the output voltage available from
a single channel. The A2150 has been designed
for bridging of its channels without the need for
input inversion adaptors.
To bridge the A2150’s two channels, use the
“CHANNEL 1 +” and “CHANNEL 2 –”
speaker connectors only (the “CHANNEL 1 –”
and “CHANNEL 2 +” remain unused). When
bridged, the A2150 will deliver optimum power
into a 4 ohm load.
The A2150 incorporates a pass-through
preamp output section, so that additional
amplifiers can be easily added to the system. The
preamp output delivers the same signal that is
connected to the A2150’s inputs.
The preamp output signal is not affected by the
“Bass Boost” processing selected for the amplifier
or by any crossover filter selected (if the input
signal is full-range, the preamp output will be
full-range).
The signal level of the “Preamp Output” is
line-level (low voltage), regardless of the position
selected in the A2150’s “Input Voltage” switch.
An additional amplifier connected to these
preamp outputs should have its input voltage
switch set to the “Low” position.
2) Left + Right Channel Information:
When bridged and fed by a stereo input, the
A2150’s channels will automatically combine
the left and right channels into a summed
mono (left + right) channel. This option is
useful when using the A2150 channels to
drive a subwoofer system or a summed mono
center channel.
Advanced Rollback Thermal protection
Unlike conventional thermal protection
systems, which shut down an amplifier when it
overheats, this system protects the amplifier by
gradually reducing power output if the amplifier’s
safe operating temperature is exceeded. The
amplifier will continue to operate and return
to normal power output once its temperature
returns to a normal range.
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JL AUDIO A2150
JL AUDIO A2150
9
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Low-Voltage protection:
SERVICING YOUR JL AUDIO AMPLIFIER
If your amplifier fails or malfunctions, please
return it to your authorized JL Audio dealer so
that it may be sent in to JL Audio for service.
There are no user serviceable parts or fuses inside
the amplifier. The unique nature of the circuitry
in the JL Audio amplifiers requires specifically
trained service personnel. Do not attempt
to service the amplifier yourself or through
unauthorized repair facilities. This will not only
void the warranty, but may result in the creation
of more problems within the amplifier.
If the car’s supply voltage drops below 10
volts, the entire amplifier will shut itself off to
protect its internal circuitry. The green “Power”
indicator will turn off when this occurs. The
amplifier will turn back on when voltage climbs
back above 10 volts. This may happen in a rapid
cycle when bass-heavy program material causes
a weak charging system to dip below 10 volts
momentarily. If this is happening in your system,
turn your audio system off and have your power
wiring, ground connections and charging
system inspected.
If you have any questions about the installation or
setup of the amplifier not covered in this manual,
please contact your dealer or technical support.
JL Audio Technical Support:
(954) 443-1100
9:00 AM – 5:30 PM (Eastern Time Zone)
Monday - Friday
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JL AUDIO A2150
JL AUDIO A2150
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APPENDIX A:
APPENDIX B:
APPENDIX C:
Input Sensitivity Level Setting
8) Increase the “Input Sens.” control until the
target voltage is observed with the voltmeter.
9) Once you have adjusted the A2150 to its
maximum low-distortion output level,
reconnect the speaker(s). The “Input Sens.”
controls can now be adjusted downward if the
amplifier requires attenuation to achieve the
desired system balance.
Precise Frequency Selection Chart
A2150 Specifications
Following the directions below will allow the
installer to adjust the input sensitivity of each
amplifier channel pair simply and easily in just a
few minutes using equipment which is commonly
available in installation bays.
“FILTER FREQ” AMP FILTER
General Specifications:
Recommended Fuse Value: 20A
Detent
Number
Panel
Marking
Actual
Freq.
Recommended Fuse Type: AFS, AGU or MaxiFuse™
Full counter-clockwise: 53
01 . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
02 . . . . . . . . . . . “50” . . . . . . . . . . . .53
03 . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
04 . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
05 . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
06 . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
07 . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
08 . . . . . . . . . . . “55” . . . . . . . . . . . .56
09 . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
12 . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
13 . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
14 . . . . . . . . . . . “60” . . . . . . . . . . . .65
15 . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
16 . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
17 . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
20 . . . . . . . . . . . “80” . . . . . . . . . . . .81
21 . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
22 . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
24 . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
25 . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
26 . . . . . . . . . . “120” . . . . . . . . . . 115
27 . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
28 . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
29 . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
30 . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
31 . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
32 . . . . . . . . . . “150” . . . . . . . . . . 177
33 . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
34 . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
35 . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
36 . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
37 . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
38 . . . . . . . . . . “200” . . . . . . . . . . 218
39 . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Full-clockwise: 225
Input Sections:
No. of Inputs: One Stereo Pair
Necessary Equipment
• Digital AC Voltmeter
Input Type: Differential-balanced with RCA jack inputs
Input Range: Switchable from 200mV - 2V RMS to
800mV - 8V RMS
• CD with a sine-wave test tone recorded at
0 dB reference level in the frequency range
to be amplified for that set of channels
(50 Hz for subwoofer channels, 1 kHz for a
midrange application). Do not use attenuated
test tones (-10 dB, -20 dB, etc.).
Do not increase any “Input Sens.” setting for
any amplifier channel or channel pair in the
system beyond the maximum level established
during this procedure. Doing so will result in
audible distortion and possible speaker damage.
Amplifier Section:
Amplifier Topology: Class A/B with patented Absolute
Symmetry™ dual N-Channel MOSFET output design
Power Supply: Unregulated MOSFET switching type
Rated Power at 12.5 V (Stereo, all channels driven):
45W RMS x 2 @ 4 ohms, 75W RMS x 4 @ 2 ohms
Rated Power at 12.5 V (Bridged, all channels driven):
90W RMS x 1 @ 8 ohms, 150W RMS x 1 @ 4 ohms
THD at Rated Power:
The Nine-Step Procedure
1) Disconnect the speaker(s) from the
amplifier’s speaker output connectors.
2) Turn off all processing (bass/treble, loudness,
EQ, etc.) on the source unit, processors (if
used) and amplifier. Set fader control to center
position and subwoofer level control to 3/4 of
maximum (if used to feed the A2150).
3) Switch the “Input Voltage” switch to “Low”
and turn the “Input Sens.” control all the
way down.
4) Set the source unit volume to 3/4 of full
volume. This will allow for reasonable gain
overlap with moderate clipping at full volume.
5) Using the chart on this page, determine the target
voltage for input sensitivity adjustment according
to the nominal impedance of the speaker system
connected to the amplifier outputs.
6) Verify that you have disconnected the speakers
before proceeding. Play a track with an
appropriate sine wave (within the frequency
range to be amplified by the A2150) at 3/4
source unit volume.
7) Connect the AC voltmeter to the speaker output
connectors of the amplifier. If the channel
pair is operating in stereo, it is only necessary
to measure one channel. If bridged, make sure
you test the voltage at the correct connectors
(L+ and R–).
It will be necessary to re-adjust the
“Input Sens.” for the affected channels if any
equalizer boost is activated after setting the
“Input Sens.” with this procedure. This applies
to any EQ boost circuit, including source unit
tone controls or EQ circuits. EQ cuts will not
require re-adjustment.
<0.08% @ 4 ohms per ch. (20 Hz - 20 kHz)
Signal to Noise Ratio: >104 dB referred to rated power
(A-weighted, 20 Hz-20 kHz noise bandwidth)
Frequency Response: 10 Hz - 25 kHz (+0, -1dB)
Damping Factor: >200 @ 4 ohms per ch./50 Hz,
>100 @ 2 ohms per ch. /50 Hz
Slew Rate: 22V/µs
Nom.
Target AC Voltage
Power output at 14.4V supply voltage and 1% THD:
Rated Power (Stereo):
Impedance
Stereo
Bridged
26.8 V
13.4 V
13.4 V
13.4 V
12.8 V
12.3 V
8Ω
6Ω
4Ω
3Ω
2Ω
45W RMS x 2 @ 4 ohms (12.5V)
75W RMS x 2 @ 2 ohms (12.5V)
25.6 V
Rated Power (Bridged):
24.6 V
90W RMS x 1 @ 8 ohms (12.5V)
not recommended
not recommended
150W RMS x 1 @ 4 ohms (12.5V)
Amplifier Filter:
Filter Type: State-variable, 12dB/octave Butterworth
with continuously variable cutoff frequency selection
from 50-200 Hz.
Configurable as Low-Pass or High-Pass. Defeatable.
Preamp Output:
Pass-through type, buffered.
Dimensions(LxWxH):
9.8" x 9.25" x 2.50" (250mm x 235mm x 63.5mm)
Due to ongoing product development, all specifications are subject to
change without notice.
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APPENDIX D: TROUBLE SHOOTING
“How do I properly set the input sensitivity on my amplifier”
“My amplifier shuts off once in a while, usually at higher volumes”
Check your voltage source and grounding point. The power supply
Please refer to Appendix A (page 12) to set the input sensitivity for
maximum, low-distortion output.
of the A2150 will operate with charging system voltages
down to 10V. Shutdown problems at higher volume levels
can occur when the charging system voltage drops below
10V. These dips can be of very short duration making them
extremely difficult to detect with a common DC voltmeter.
To ensure proper voltage, inspect all wiring and termination
points. It may also be necessary to upgrade the ground
wire connecting the battery to the vehicle’s chassis and the
power wire connecting the alternator to the battery. Many
vehicles employ small (10 AWG - 6 AWG) wire to ground the
battery to the vehicle’s chassis and to connect the alternator to
the battery. To prevent voltage drops, these wires should be
upgraded to 4 AWG when installing amplifier systems with
main fuse ratings above 60A. Grounding problems are the
leading cause of misdiagnosed amplifier “failures.”
“My amplifier doesn’t turn on”
Check the fuse, not just visually, but with a continuity meter. It is
possible for a fuse to have poor internal connections that
cannot be found by visual inspection. It is best to take the
fuse out of the holder for testing. If no problem is found with
the fuse, inspect the fuse-holder.
Check the integrity of the connections made to each of the
“+12VDC”, “Ground”, and “Remote” terminals. Ensure
that no wire insulation is pinched by the terminal set screw
and that each connection is tight.
Check to make sure there is +12V at the “Remote” connection of the
amplifier. In some cases, the turn-on lead from the source unit
is insufficient to turn on multiple devices and the use of a relay
is required. To test for this problem, jump the “+12VDC” wire
to the “Remote” terminal to see if the amplifier turns on. If this
does not work, proceed to the next step.
“My amplifier turns on, but there is no output”
Check the input signal using an AC voltmeter to measure the
voltage from the source unit while an appropriate test tone is
played through the source unit (disconnect the input cables
from the amplifier prior to this test). The frequency used
should be in the range that is to be amplified by the amplifier
(example: 50 Hz for a sub bass application or 1 kHz for a full
range / high-pass application). A steady, sufficient voltage
(between 0.2 and 8.0-volts) should be present at the output of
the signal cables.
Check the output of the amplifier. Using the procedure explained in
the previous check item (after plugging the input cables back
into the amplifier) test for output at the speaker outputs of
the amplifier. Unless you enjoy test tones at high levels, it is
a good idea to remove the speaker wires from the amplifier
while doing this. Turn the volume up approximately half
way. 5V or more should be measured at the speaker outputs.
This output level can vary greatly between amplifiers but it
should not be in the millivolt range with the source unit at
half volume. If you are reading sufficient voltage, check your
speaker connections as explained below.
“I get a distorted / attenuated sound coming out of the speaker(s)”
Check the speaker wires for a possible short, either between the
positive and negative leads or between either speaker lead
and the vehicle’s chassis ground. If a short is present, you
will experience distorted and/or attenuated output. The
“Protect” light will illuminate in this situation. It may be
helpful to disconnect the speaker wires from the amplifier
and use a different set of wires connected to a test speaker.
Check the nominal load impedance to verify that each channel
of the amplifier is driving a load equal to or greater than
2 ohms in stereo mode (4 ohms bridged).
Check the input signal and input signal cables to make sure signal
is present at the “Amplifier Inputs” and the cables are not
pinched or loose. It may be helpful to try a different set of
cables and/or a different signal source to be sure.
“My amplifier’s output fluctuates when I tap on it or hit a bump”
Check the connections to the amplifier. Make sure that the
insulation for all wires has been stripped back far enough to
allow a good contact area inside the terminal block.
Check the input connectors to ensure that they all are making good
contact with the input jacks on the amplifier.
Check to ensure that the speaker wires are making a good
connection with the metal inside the terminal block. The
speaker wire connectors are designed to accept up to 8 AWG
wire. Make sure to strip the wire to allow for a sufficient
connection with the metal inside the terminal block.
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INSTALLATION NOTES:
Use this diagram to document your amplifier’s switch and control positions.
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INSTALLATION NOTES:
INSTALLATION NOTES:
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