models 2400d
2
© 2002 Directed Electronics, Inc
CONGRATULATIONS
Congratulations for choosing a Directed
Audio power amplifier from Directed
Electronics, the industry leader in high
quality automotive security and audio
equipment since 1990.
Directed Audio power amplifiers
continue to set new standards of performance, reliability, and affordability in
the mobile electronics industry.
Featuring high-efficiency MOSFET power
supplies, flexible on-board crossovers,
and state of the art audio design,
Directed Audio power amplifiers will
excite and delight the mobile sound
enthusiast with years of high-quality
audio reproduction.
Directed Audio power amplifiers come
with a two-year limited warranty if
installed by an authorized Directed
dealer. If not installed by an authorized
dealer, Directed Audio power amplifiers
are covered by a one-year, parts-andlabor limited warranty.
Be sure to retain your original sales
receipt and refer to the warranty section
of this guide for full details about your
coverage.
TABLE OF CONTENTS
Limited Two-Year Consumer Warranty . . . . . . . . . . . . . . . . . . . . . . . . .4
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Front Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Rear Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Top Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Top Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Speaker Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Combining Amplifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Multiple Amplifier Combinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Parallel Synced Gain Connections/Settings . . . . . . . . . . . . . . . . . . . . .15
Crossover Settings and Gain Adjustment . . . . . . . . . . . . . . . . . . . . . . .17
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
© 2002 Directed Electronics, Inc
3
LIMITED TWO-YEAR CONSUMER WARRANTY
Directed Electronics, Inc. promises to the
original purchaser, to replace this product
should it prove to be defective in workmanship 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 authorized Directed dealer, the warranty period
will be one year from the date of purchase
by the dealer as indicated by the date code
marking of the product. During this one-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
4
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 ONE-YEAR PARTS AND LABOR
WARRANTY. Note: This warranty does not
cover labor costs for the removal and reinstallation 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.
© 2002 Directed Electronics, Inc
FEATURES
„
Super-efficient Class D PWM design
runs much cooler than conventional
amps.
„
High-speed MOSFET switching
power supply.
„
High-current complimentary MOSFET
outputs stable into two ohm loads.
„
Thermal, DC offset, reverse polarity,
and short circuit protection with
status LED.
„
Master/slave RCA jack function
supports multiple amplifier systems
with synced gain.
„
Top-mounted controls easily
accessed for system tuning.
„
Continuously variable 18 dB/
octave low-pass crossover.
„
Switchable 30 Hz, 24 dB/octave
subsonic filter.
„
Switchable 8 dB bass EQ function.
„
Switchable phase adjustment.
„
Remote subwoofer level control
supplied.
„
Variable input sensitivity optimizes
match with different signal sources.
„
Gold-plated screw-block terminals
and RCA connectors ensure
maximum signal transfer.
„
Rugged one-piece extruded heat
sink finished with injection-molded
mounting feet.
WARNING
High-powered car audio
systems may produce
sound pressure levels that exceed the
threshold at which hearing loss may
result.
© 2002 Directed Electronics, Inc
They may also impair a driver’s ability to
hear traffic sounds or emergency vehicles. Use common sense and practice
safe listening habits when listening to or
adjusting your audio system.
5
INSTALLATION GUIDELINES
1. Please read this owner’s manual
carefully before installing this amplifier.
2. Disconnect the battery ground
terminal prior to making any electrical connections.
3. Check for any hazards or obstructions 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 ventilation 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.
7. Always fuse your power connection
within 8 to 10 inches of the battery
6
terminal. Use a fuse or circuit
breaker rated slightly more than the
fuse(s) of the amplifier. 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 recommendations for the individual amplifiers 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 necessary, upgrade it by adding an additional 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.
8. This amplifier is designed to drive a
speaker load that measures from 2
to 4 ohms. Keep in mind that heat
is the long-term enemy of automotive electronics and the lower your
speaker load, the more heat is
generated. For low impedance
© 2002 Directed Electronics, Inc
speaker applications or restricted
ventilation installations, an external
cooling fan may be advisable.
9. Battery and ground connections to
the vehicle should be made with
crimped ring terminals of the appropriate size (surface area is what
counts); soldering the terminals
after crimping is also recommended.
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.
10. Due to the high-frequency MOSFET
switching power supply, filtering the
© 2002 Directed Electronics, Inc
7
FRONT PANEL CONNECTIONS
4. Slave/Master Switch - Controls
whether the amplifier is a slave or
master when connected in the
Parallel Synced Gain combination.
(Refer to the Combined Amplifiers
section of this guide.)
1. RCA Input Jacks - Accepts line level
outputs from head units or signal
processors at voltages between
150mV and 8 volts.
2. RCA Sync Out Jack - This RCA jack
sends a synced, or in-phase, gain
matched signal to a slave 2400d
when connected in the Parallel
Synced Gain combination. (Refer to
Combined Amplifiers section of this
guide.)
5. Remote Sub Level Control - Controls
the subwoofer amplifier gain
controls from a remote location for
ease of adjustment during listening.
Warning: DO NOT connect a level control knob from other
manufacturers to the Remote Sub Level Control of
any Directed amplifier. Even though the connectors
fit properly, the control knob and connector pin
positions may be different and the amplifier will be
damaged.
3. RCA Slave In Jack - This RCA
accepts input from a master 2400d
when connected in the Parallel
Synced Gain combination. (Refer to
Combined Amplifiers section of this
guide.)
FIGURE 1—AMPLIFIER CONNECTIONS 2400d FRONT
23
1
INPUT
8
I/O
4
SLAVE
R
SYNC OUT
L
SLAVE IN
5
MASTER
REMOTE
© 2002 Directed Electronics, Inc
REAR PANEL CONNECTIONS
1. Status LEDs - The Power LED will
light GREEN to indicate the amplifier
is on and operating normally. The
GREEN LED will turn off and the
Protection LED will light RED when
the amplifier has shut itself down
due to speaker short circuit, DC
offset, or overheating.
2. Sub Out Terminals - Connect
subwoofers to these terminals.
(Refer to the Speaker Wiring
Diagrams section of this guide.)
3. (+) 12 Volt Power - Connect this
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.
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.
turn on lead of the head unit or signal
source. If a (+) 12 volt remote turn
on lead is not available, 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.
5. Ground - 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.
4. Remote Turn On - This terminal turns
on the amplifier when (+) 12 volt is
applied to it. Connect it to the remote
© 2002 Directed Electronics, Inc
9
FIGURE 2—AMPLIFIER CONNECTIONS 2400d REAR
1
2
3 4 5
BATT
REM
GND
POWER
PROTECTION
10
SUB OUTPUT
© 2002 Directed Electronics, Inc
TOP PANEL CONTROLS
1. Input Gain Adjustment - Controls
the amplifier’s sensitivity and is
used to match the input level of the
amplifier to the output level of the
signal source.
frequencies at 30Hz. Frequencies
below 30Hz will be attenuated by
24db per octave.
4. Bass EQ Switch - Adds 8 db of additional boost to the subwoofer
output when active.
2. Crossover Frequency Adjustment Adjusts the crossover point for the
on-board low-pass crossover.
5. Sub Phase Switch - Changes the
phase of the subwoofer output by
180 degrees.
3. Subsonic Frequency Switch - Sets
the cutoff point for subsonic
FIGURE 4—AMPLIFIER CONTROLS TOP
GAIN
FREQ
2
1
MIN
MAX
OFF
30Hz
ON
BASS EQ
250Hz
OFF
ON
3
SUBSONIC
4
PHASE
0
180
5
TOP PANEL FEATURES
Control Panel Cover
Remove/Install
The gain and filter controls are located
under a control panel cover on top of
the amplifier. The control panel cover
must be removed to gain access to the
gain and filter controls.
Four Allen-head screws hold the control
panel cover to the amplifier top panel,
one at each corner. They can be
removed with the wrench supplied in
the hardware pack.
© 2002 Directed Electronics, Inc
11
SPEAKER WIRING DIAGRAMS
Single subwoofer connection (top view)
Two subwoofer connection (top view)
NOTE:
12
The dual + and -- subout terminals of the 2400d are paralleled internally and the combined load impedance should be taken
into consideration when connecting multiple subwoofers.
© 2002 Directed Electronics, Inc
COMBINING AMPLIFIERS
The Viper 2400d subwoofer amplifiers
has the capability of connecting two or
more 2400d amplifiers in a master/slave
combination for increased power with
accurate level matching. It is called the
Parallel Synced Gain combination.
WARNING: DO NOT attempt to combine amplifiers of different
power ratings. This amplifier combination works
correctly only if the master and slave amplifiers are
identical models.
Parallel Synced Gain
In this master/slave combination the
master amplifier pre-amp controls remain
active and the slave amplifier pre-amp is
bypassed. This allows the master amplifier to control gain, filter, and sub-level
on all amplifiers.
This combination allows the amplifiers to
drive their own separate subwoofer(s)
while being synced together via an inphase audio pre-amp signal from the
© 2002 Directed Electronics, Inc
master amplifier. Wiring connections to
the amplifier subwoofer outputs in this
combination should be standard in-phase
configurations, creating a parallel
speaker connection. (Refer to Parallel
Synced Gain section of this guide for
amplifier and speaker connection
diagrams.)
NOTE:
One master amplifier can control up to three slave
amplifiers in this combination. Multiple identical
master/slave combinations can be added to any
given system.
Combined Amplifiers Gain
and Filter Settings
Set the Subsonic, EQ, and other filter
settings on the master amplifier to the
positions that achieve the best sound
quality. Adjustment guidelines are
discussed in the Crossover and Gain
Adjustment section of this guide.
13
MULTIPLE AMPLIFIER COMBINATIONS
The Directed 2400d subwoofer amplifiers can also be used in multiples of the
Parallel Synced Gain combination
allowing for unlimited expansion to a
systems subwoofer section. To use
multiples of the Parallel Synced Gain
combination the following directions
must be adhered to for best results.
„
„
14
Audio signal - Divide the head unit
or processor audio signal to the
master amplifier by using RCA Y
adapters. Be sure to divide them an
even number of times to ensure the
input level at each master amplifier
is matched.
Remote Sub Level Control - The
Remote Sub Level Control cable can
be divided several times to connect
to each master amplifier. This can
be accomplished by using one or
more Directed Remote Sub Level
cable splitters. Standard single-todouble phone line splitters and
accessories from a local electronics
store can also be used.
For systems with more than two
master/slave combinations, use
multiple single-to-double splitters.
Do not use phone splitters that
divide the signal more than once
per splitter or splitters designed for
multiple uses.
„
Amplifier configuration - When
using multiple Parallel Synced Gain
amplifier combinations follow the
instructions in the Parallel Synced
Gain section of this guide for each
individual combination.
© 2002 Directed Electronics, Inc
PARALLEL SYNCED GAIN CONNECTIONS/SETTINGS
1. Input Signal - Connect these RCA
jacks as described in the Front Panel
Connection section of this guide.
2. Slave/Master Switch
Set the slave/master switch
on the master amplifier to the
MASTER position.
„
Set the slave/master switch
on the slave amplifier to the SLAVE
position.
„
Setting the slave/master
switch on both amplifiers will automatically set the I/O RCA jack
configuration according to each
amplifier’s slave or master designation.
„
NOTE:
4. Signal Connection - Connect an RCA
cable between the SYNC OUT RCA
jack of the master amplifier and the
SLAVE IN RCA jack of the slave
amplifier as shown in the Figure 5.
5. Subwoofer Speaker Connection - In
this amplifier combination each
amplifiers must drive its own separate subwoofer(s). Connect the
speaker terminals of each amplifier
to any combination of one or more
subwoofers that results in nominal
impedance between 2 and 4 ohms.
Make sure that each amplifier sees
the same speaker impedance.
One master amplifier can control up to three slave
amplifiers in this combination. Multiple identical
master/slave combinations can be added to any
given system.
3. Remote Sub Level Control - Connect
the Remote Sub Level Control to the
master amplifier only. The master
amplifiers subwoofer gain is used to
set the overall gain for all synced
amplifiers, then the Remote Sub
Level Control can adjust the gain of
all synced amplifiers.
© 2002 Directed Electronics, Inc
15
FIGURE 5—PARALLEL SYNC GAINED 2400d
Master
2
1
INPUT
I/O
R
SLAVE
MASTER
SYNC OUT
L
REMOTE
SLAVE IN
4
Do Not Use
3
MIN
Slave
Do Not Use
INPUT
I/O
R
SLAVE
MAX
SUB LEVEL
MASTER
SYNC OUT
I/O
L
REMOTE
SLAVE IN
Do Not Use
2
Do Not Use
Subwoofer Wiring (top view)
5
NOTE:
16
The dual + and -- subout terminals of
the 2400d are paralleled internally
and the combined load impedance
should be taken into consideration
when connecting multiple subwoofers.
© 2002 Directed Electronics, Inc
CROSSOVER SETTINGS AND GAIN ADJUSTMENT
Your Directed Audio power amplifier needs to be adjusted carefully to achieve
maximum performance. These are some guidelines to follow when fine-tuning the
amplifier.
„
Because this amplifier is only designed for subwoofer applications, the low-pass
crossover is active at all times. The crossover point is adjustable to allow more
precise system operation.
„
Try and keep the setting low enough to prevent 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. It will be to your
advantage to spend some extra time with this adjustment, 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 amplifier operation. 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.
„
For systems using the Remote Sub Level Adjustment, increase the subwoofer gain
on the amplifier by 25% and set the Remote Sub Level knob to the center position
after making all system gain and filter adjustments. This will give the Remote Sub
Level Control a wider range of adjustment to the subwoofer output.
„
You should take into consideration the effect that gain adjustment has on system
frequency response and staging. 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!
© 2002 Directed Electronics, Inc
17
SPECIFICATIONS
Directed model 2400d
RMS continuous power driven into 4 ohms from 20 to 250
Hz @ 14.4 VDC at rated power/load.
1400 watts
0.8% THD
RMS continuous power driven into 2 ohms from 20 to 250
Hz @ 14.4 VDC at rated power/load.
2400 watts
1.0% THD
Dynamic power rating (IHF-202 Standard) minimum load.
2600 watts
Signal-to-Noise Ratio
Frequency Response
Damping Factor
Crossover
Greater than 80 dB
20-250 Hz +0, -1 dB
50 (typical)
Low-pass 18 dB/octave,
variable from 30 to
250 Hz
Switchable 30 Hz
24 dB per octave
Switchable 8 dB,
centered at 40Hz
20K ohms
Variable from 150 mV
to 8 volt
2 to 4 ohms
10 to 16 VDC
200A
#0 Battery to fuse block
#4 Fuse block to
amplifier
#4 Amplifier to chassis
Subsonic Filter
Bass Equalization
Input Impedance
Input Sensitivity
Output Impedance
Supply Voltage
Fusing and Power
Minimum Cable Requirements (AWG) (+) 12 Volt
(Per amp, trunk mounted)
Minimum Cable Reguirements (Ground)
18
© 2002 Directed Electronics, Inc
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
Directed Electronics, Inc.
Vista, California 92083
www.directed.com
technology, Directed is ISO 9001 registered.
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
20
© 2002 Directed Electronics, Inc. - All rights reserved - G45019 03/02
© 2002 Directed Electronics, Inc