model
150.2
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CONGRATULATIONS
Congratulations for choosing a Viper
Audio power amplifier from Directed
Electronics, the industry leader in high
quality automotive security and audio
equipment since 1990.
delight the mobile sound enthusiast with
years of high-quality audio reproduction.
Viper Audio power amplifiers come with
a two-year limited warranty if installed
by an authorized Viper dealer. If not
installed by an authorized dealer, Viper
Audio power amplifiers are covered by a
one-year, parts-and-labor limited
warranty.
With the introduction of Viper Audio
power amplifiers, Directed Electronics
continues to set new standards of
performance, reliability, and affordability
in the mobile electronics industry.
Be sure to retain your original sales
receipt and refer to the warranty section
of this guide for full details about your
coverage.
Featuring high-efficiency MOSFET power
supplies, flexible on-board crossovers,
and state of the art audio design, Viper
Audio power amplifiers will excite and
TABLE OF CONTENTS
Limited Two-Year Consumer Warranty . . . . . . . . . . . . . . . . . . . . . . . . .4
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Wire Connector Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Front Panel Connections/Controls . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Rear Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Top Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Speaker Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Crossover Settings and Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . .12
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3
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LIMITED TWO-YEAR CONSUMER WARRANTY
Directed Electronics, Inc. promises to the
original purchaser, to replace this product
should it prove to be defective in workman-
ship or material under normal use, for a
period of two years from the date of
purchase by the dealer as indicated by the
date code marking of the product
PROVIDED the product was installed by an
authorized Directed dealer. During this two
year period, there will be no charge for this
replacement PROVIDED the unit is returned
to Directed, shipping pre-paid. If the unit is
installed by anyone other than an autho-
rized Directed dealer, the warranty period
will be 1 year from date of purchase by the
dealer as indicated by the date code
marking of the product. During this 1 year
period, there will be no charge for this
replacement PROVIDED the unit is returned
to Directed, shipping pre-paid. This warranty
is non-transferable and does not apply to
any unit that has been modified or used in a
manner contrary to its intended purpose,
and does not cover damage to the unit
caused by installation or removal of the unit.
This warranty is void if the product has been
damaged by accident or unreasonable use,
neglect, improper service or other causes
not arising out of defects in materials or
construction. ALL WARRANTIES INCLUDING
BUT NOT LIMITED TO EXPRESS
WARRANTY, IMPLIED WARRANTY,
WARRANTY OF MERCHANTABILITY,
FITNESS FOR PARTICULAR PURPOSE, AND
WARRANTY OF NON-INFRINGEMENT OF
INTELLECTUAL PROPERTY ARE EXPRESSLY
EXCLUDED TO THE MAXIMUM EXTENT
ALLOWED BY LAW, AND DIRECTED
NEITHER ASSUMES NOR AUTHORIZES
ANY PERSON TO ASSUME FOR IT ANY
LIABILITY IN CONNECTION WITH THE
SALE OF THE PRODUCT. DIRECTED HAS
ABSOLUTELY NO LIABILITY FOR ANY AND
ALL ACTS OF THIRD PARTIES INCLUDING
ITS AUTHORIZED DEALERS OR
INSTALLERS. Unit must be returned to
Directed, postage pre-paid, with: consumer’s
name, telephone number, and address,
authorized dealer’s name and address, and
product description. IN ORDER FOR THIS
WARRANTY TO BE VALID, YOUR UNIT
MUST BE SHIPPED WITH PROOF OF
INSTALLATION BY AN AUTHORIZED
DIRECTED DEALER. ALL UNITS RECEIVED
BY DIRECTED FOR WARRANTY REPAIR
WITHOUT PROOF OF DIRECTED DEALER
INSTALLATION WILL BE COVERED BY THE
LIMITED 1 YEAR PARTS AND LABOR
WARRANTY. Note: This warranty does not
cover labor costs for the removal and rein-
stallation of the unit. BY PURCHASING
THIS PRODUCT, THE CONSUMER AGREES
AND CONSENTS THAT ALL DISPUTES
BETWEEN THE CONSUMER AND Directed
SHALL BE RESOLVED IN ACCORDANCE
WITH CALIFORNIA LAWS IN SAN- DIEGO
COUNTY, CALIFORNIA.
4
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FEATURES
„ High-speed MOSFET switching
power supply and complimentary
bipolar outputs.
„ Gold-plated screw-block plugs and
RCA jacks ensure maximum signal
transfer.
„ Stereo, mono, or simultaneous
„ Viper snake logo engraved in plexi-
glass and illuminated with blue
LED.
stereo/mono operation.
„ Thermal, DC offset, reverse polarity
and short circuit protection.
„ Rugged one-piece extruded heat
sink finished with injection-molded
mounting feet.
„ Continuously variable 12 dB/
octave two way active crossover.
„ The Viper logo and Viper badge are
four-way adjustable for a custom
look.
„ Switchable 8 dB bass EQ function.
„ Buffered stereo full-range RCA
output jacks.
„ Variable input sensitivity optimizes
match with different signal sources.
WARNING
High-powered car audio
systems may produce
sound pressure levels that exceed the
threshold at which hearing loss may
result.
They may also impair a driver’s ability to
hear traffic sounds or emergency vehi-
cles. Use common sense and practice
safe listening habits when listening to or
adjusting your audio system.
5
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INSTALLATION GUIDELINES
1. Please read this owner’s manual
carefully before installing this ampli-
fier.
terminal. Use a fuse or circuit
breaker rated slightly more than the
on-board fuse(s) of the
amplifier(s). The gauge of power
wire used should take into account
the total current draw of the
system, and the length of wire
used. IASCA and other auto sound
competition organizations have
charts available for this; you can
also find a chart in the MECP study
guide. Minimum wire gauge recom-
mendations for the individual ampli-
fiers are listed on the specification
page. Always use the same gauge
wire for the amplifier ground that
you use for the power wire. Be sure
to examine the battery ground
cable of the vehicle, and if neces-
sary, upgrade it by adding an addi-
tional ground wire that is the same
gauge as the amplifier’s power
wire. Remember, the amplifier can
only deliver its rated output when it
is not current limited by the power
and ground supply wires.
2. Disconnect the battery ground
terminal prior to making any elec-
trical connections.
3. Check for any hazards or obstruc-
tions such as gas tanks, fuel or
brake lines, and wiring harnesses
before mounting the amplifier.
4. Pick a mounting location that will
provide adequate access and venti-
lation and protect the amplifier
from heat, moisture, and dirt.
5. Avoid sharp metal areas when
routing cables to the amplifier, and
run RCA cables away from the
power cables and other potentially
noisy car harnesses.
6. The amplifier should be grounded
with a short, heavy gauge wire
connected directly to the car at a
bare metal surface, preferably
scraped body sheet metal. Do not
use factory ground locations, seat
bolts, or brackets that are
spotwelded.
8. This amplifier is designed to drive a
speaker load that measures from 2
to 8 ohms. Keep in mind that heat
is the long-term enemy of automo-
tive electronics and the lower your
speaker load, the more heat is
7. Always fuse your power connection
within 8 to 10 inches of the battery
6
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generated. For low impedance
speaker applications or restricted
ventilation installations, an external
cooling fan may be advisable.
switching power supply, filtering the
power cable is not generally
required (remember that the amp
can’t deliver full output if the power
supply is restricted). Proper
grounding of the signal source is
mandatory for the amplifier to
reach its performance peak. If the
RCA inputs are not grounded
adequately via the signal source,
electrical noise from the vehicle
may be picked up in the system.
9. Battery and ground connections to
the vehicle should be made with
crimped ring terminals of the appro-
priate size (surface area is what
counts); soldering the terminals
after crimping is also recom-
mended.
10. Due to the high-frequency MOSFET
WIRE CONNECTOR PLUGS
Power and speaker wire connections on
Viper Audio power amplifiers are
performed with the use of specially
designed connectors that allow for ease
of wire termination and installation
convenience.
2. Cut wires to the minimum length
necessary.
3. Trim the wire ends so bare wire
does not protrude from the
connector after termination.
4. Always tighten the connector
screws firmly at least twice, once
during installation and once more
before returning the car to the
customer.
Poor connections are a common cause
of poor sound quality or amplifier perfor-
mance. Making proper wire connections
is paramount to a reliable, quality sound
system.
CAUTION: Over tightening the screws can cause them to
strip, creating loose connections. Tighten the
screws twice firmly for a permanent, solid
connection.
Please follow these recommendations to
ensure a problem free installation:
1. Always use the proper gauge wire
for the connector.
7
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FRONT PANEL CONNECTIONS/CONTROLS
RCA Output Jacks -
through RCA jacks can be used to
send a signal to a second amplifier.
1.
These pass
is used for mid-range speakers and
tweeters. LPF attenuates high
frequencies and is used for
subwoofer speakers.
RCA Input Jacks -
2.
Accepts line level
Crossover Frequency Adjustment -
Adjusts the crossover point for the
on-board active crossovers.
5.
6.
7.
outputs from head units or signal
processors at voltages between
150mV and 8 volts.
Bass EQ Switch
- Adds an additional
Input Gain Adjustment -
3.
4.
Controls
8 db of boost to the subwoofer
output when on.
amplifier sensitivity and is used to
match the input level of the ampli-
fier to the output level of the signal
source.
Status LED
- Will light GREEN to
indicate the amplifier is on and
operating normally, and will be off
if the amplifier shuts down due to
short circuit, DC offset, or over-
heating detected by on-board
protection circuitry.
Crossover Selection Switch -
Controls the type of filter for the on-
board active crossover. FLAT does
not attenuate any frequencies and
is for full-range speaker systems.
HPF attenuates low frequencies and
FIGURE 1—AMPLIFIER CONNECTIONS 150.2 FRONT
2
1
3
4
5
7
6
8
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REAR PANEL CONNECTIONS
Speaker Out Terminals
1.
- Connect
terminal through a FUSE or CIRCUIT
BREAKER to the positive terminal of
the vehicle battery or the positive
terminal of an isolated audio
system battery.
the speakers to these terminals.
(Refer to the Speaker Connection
section of this guide.)
Remote Turn On
2.
- This terminal
turns on the amplifier when (+) 12
volt is applied to it. Connect it to
the remote turn on lead of the head
unit or signal source. If a (+) 12
volt remote turn lead is not avail-
able, a Remote Power Adapter
(P/N #55000) can be used to
supply a remote turn on signal. DO
NOT connect this terminal to
constant (+) 12 volt.
WARNING: Always protect this power wire by installing a fuse
or circuit breaker of the appropriate size within
12 inches of the battery terminal connection.
Ground -
5.
Connect this terminal
directly to the sheet metal chassis
of the vehicle using the shortest
wire necessary to make this
connection. Always use wire of the
same gauge or larger than the (+)
12 volt power wire. The chassis
connection point should be scraped
free of paint and dirt. Use only
quality crimped and/or soldered
connectors at both ends of this
wire. DO NOT connect this terminal
directly to the vehicle battery
ground terminal or any other
factory ground points.
Power Fuse -
3.
4.
This fuse protects the
amplifier against internal electrical
damage and is meant to protect the
amplifier only. All other power
connections should be fused at the
source.
(+) 12 Volt Power
- Connect this
FIGURE 2—AMPLIFIER CONNECTIONS 150.2 REAR
2
3
5
4
1
9
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TOP PANEL FEATURES
Top Panel Cover
window that don't have tape. Make
sure to apply the tape to the side
that makes contact with the cover.
Save the other two precut pieces of
tape for future use.
To install the cover
„
- Place the
straight end of the control panel
cover into the notched end of the
amplifier’s top panel while
elevating the curved end. Lower the
curved end of the cover until the
magnets make contact.
3. Turn the illuminated window so the
Viper snake logo will be in an
upright position when the cover is
re-attached to the amplifier. Press
the window onto the underside of
the control panel cover using the
positioning pins for alignment.
To remove the cover
„
- Place a finger
on the curved end of the cover
while lifting up the straight end
with your thumb. When the
magnets lose contact, lift and
remove the cover.
Viper Badge Mounting
The Viper Badge can be rotated in 90-
degree increments to accommodate the
amplifier’s final mounting position.
Illuminated Window
Alignment
The illuminated window comes attached
to the control panel cover with a light
adhesive tape. An additional supply of
precut adhesive tape is included in the
hardware pack.
1. Determine the final mounting posi-
tion of the amplifier.
2. Determine the position required for
the badge to be viewed horizontally.
3. Remove the protective cover for the
adhesive tape on the under side of
the badge.
1. Firmly hold the control panel cover
while gently pressing against the
window from the top. If the
window will not release easily use a
small flat tool to pry it loose. Pry
slowly and evenly from several
points to avoid deforming or
cracking the window.
4. Align the badge guideposts with the
holes in the amplifier top panel.
5. Press down firmly until the logo is
securely attached to the amplifier.
2. Apply two of the precut pieces of
adhesive tape to the corners of the
10
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SPEAKER WIRING DIAGRAMS
Stereo operation (bottom view)
Mono operation (bottom view)
Simultaneous stereo/mono operation (bottom view)
11
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CROSSOVER SETTINGS AND GAIN ADJUSTMENT
Your Viper Audio power amplifier needs to be adjusted carefully to achieve maximum
performance. These are some guidelines to follow when fine-tuning the amplifier.
„ For full-range and simultaneous stereo/mono bass applications, the crossover
selection switch should be set to FLAT. If the amplifier is driving your subwoofers,
set the switch to LPF, and for mid-bass/midrange output, set to HPF.
„ The crossover frequency control needs to be adjusted to suit your particular system.
For subwoofer applications, try to keep the setting low enough to prevent the
image smearing (you should not be able to hear male voices from the subwoofer)
but not so low as to create a gap between the subwoofer and the mid-
bass/midrange speakers. For mid-bass/midrange settings, try to keep the setting
low enough to keep your sound stage in front of you, without overdriving the
speaker. It will be to your advantage to spend some extra time with this adjust-
ment, listening to familiar music or system set-up discs to achieve the kind of
musical reproduction that you prefer.
„ The gain adjustment allows you to set proper signal match for clean, quiet ampli-
fier operation. For full-range and simultaneous stereo/mono bass applications,
start by playing some music you are familiar with. With the gain adjustment on
the amplifier in the middle of its rotation, bring up the volume on your head unit
to the 3/4 volume setting or until you start to hear distortion or clipping. If you
hear distortion before you reach the 3/4 volume setting of your head unit, reduce
the gain setting on the amplifier and start to raise the head unit volume again.
When you can listen to the music at or slightly above 3/4 on your head unit
without audible distortion, slowly raise the gain of the amplifier until distortion is
heard, then back off the gain until the distortion is not audible. This setting will
allow you to reach full output with all but the quietest of source material, while
avoiding excessive noise in the system.
„ The same procedure should be used for adjusting the amplifier when the on-board
crossover is set to LPF or HPF, but you will also have to take into consideration the
effect that gain adjustment has on system frequency response and imaging.
Again, plan on spending some time with music that you know, getting the gain
and crossover settings the way you like. Test discs and analyzers may help with this
process, but in the end it's your ears that count - listen to the music!
12
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SPECIFICATIONS
Viper model 150.2
RMS continuous power per channel, both chan-
nels driven into 4 ohms from 20 to 20,000 Hz,
with less than 0.08% Total Harmonic Distortion
@ 14.4 VDC
50 watts
75 watts
RMS continuous power per channel, both chan-
nels driven into 2 ohms from 20 to 20,000 Hz,
with less than 0.1% Total Harmonic Distortion @
14.4 VDC
150 watts
RMS continuous power bridged into a 4 ohm
load from 20 to 20,000 Hz, with less than 0.1%
Total Harmonic Distortion @ 14.4 VDC
Dynamic power rating (IHF-202 Standard)
bridged into 4 ohms
200 watts
Signal-to-Noise Ratio
Frequency Response
Damping Factor @ 4 ohm
Crossover
Greater than 95 dB
20-20,000 Hz 0.5 dB
Greater than 200
Switchable high or low pass
12 dB/octave, continuously
variable from 50 to 500 Hz
Bass Equalization
Switchable +8 dB,
centered at 40Hz
Input Impedance
Input Sensitivity
Output Impedance
20K ohms
Variable from 150 mV to 8 volt
2 to 8 ohms, stereo 4 to 8 ohms,
bridged
Supply Voltage
10 to 16 VDC
20A
Fusing and Power
Minimum Cable Requirements (AWG)
(Per amp, trunk mounted)
#12
13
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The company behind this system is Directed Electronics, Inc.
Since its inception, Directed has had one purpose, to provide customers with the
finest vehicle security, car stereo products, rear seat entertainment, and accessories
available. The recipient of more than 20 patents in the field of advanced electronic
technology, Directed is ISO 9001 registered.
Directed Electronics, Inc.
Vista, California 92083
Directed® is committed to delivering world-class quality
products and services that excite and delight our customers.
Directed is a proud member of
Quality Directed products are sold and serviced throughout North America and around the world
Call 800 274 0200 for more information about our products and services
© 2002 Directed Electronics, Inc. - All rights reserved - G46022 02/02
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