750d
1500d
models
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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 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
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 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.
3
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FEATURES
„ Super-efficient Class D PWM design
runs much cooler than conventional
amps.
„ Switchable 30 Hz, 24 dB/octave
subsonic filter.
„ Switchable 8 dB bass EQ function.
„ Switchable phase adjustment.
„ High-speed MOSFET switching
power supply.
„ Remote subwoofer level control
„ High-current complimentary MOSFET
supplied.
outputs stable into one ohm loads.
„ Variable input sensitivity optimizes
„ Thermal, DC offset, reverse polarity,
and short circuit protection with
status LED.
match with different signal sources.
„ Gold-plated wire terminals and RCA
connectors ensure maximum signal
transfer.
„ Master/slave RCA jack functions
support two amps bridged to one
load.
„ Rugged one-piece extruded heat
sink finished with injection-molded
mounting feet.
„ Top-mounted controls easily
accessed for system tuning.
„ Continuously variable 18 dB/
octave low-pass crossover.
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.
4
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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 spot
welded.
8. This amplifier is designed to drive a
speaker load that measures from 1
to 4 ohms. Keep in mind that heat
is the long-term enemy of automo-
tive electronics and the lower your
7. Always fuse your power connection
within 8 to 10 inches of the battery
5
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speaker load, the more heat is
generated. For low impedance
speaker applications or restricted
ventilation installations, an external
cooling fan may be advisable.
10. Due to the high-frequency MOSFET
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.
6
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FRONT PANEL CONNECTIONS
RCA Input Jacks -
RCA Bridge Output Jack
- This output
1.
Accepts line level
3.
4.
5.
outputs from head units or signal
processors at voltages between
150mV and 8 volts.
sends an out-of-phase signal to a
slave amplifier when connected in
the External Synced Bridged combi-
nation. (Refer to the Combined
Amplifiers section of this guide)
RCA Sync Out/ Slave In Jack
2.
Sync Out - This RCA jack sends a
Synced or in-phase gain matched
output signal to a slave amplifier
when connected in the Parallel
Synced Gain combination. It is a
Synced output when the
slave/master switch is in the
MASTER position only.
Slave/Master Switch
- Controls
whether the amplifier is a slave or
master when connected in
combined amplifier configurations.
(Refer to the Combined Amplifiers
section of this guide.)
Remote Sub Level Control
- Controls
the subwoofer amplifier gain
controls from a remote location for
ease of adjustment during listening.
Slave In - This RCA jack accepts
input from a master amplifier. It is
for use in the Parallel Synced Gain
and External Synced Bridged combi-
nations. It is a slave input when the
slave/master control switch is in
the SLAVE position only.
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.
FIGURE 1—AMPLIFIER CONNECTIONS 750d/1500d FRONT
2
1
3 4
5
INPUT
I/O
SLAVE
MASTER
SLAVE IN
SYNC OUT
R
L
REMOTE
BRIDGE OUT
7
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REAR PANEL CONNECTIONS
Sub Out Terminals
Remote Turn On
- This terminal turns
1.
- Connect
5.
subwoofers to these terminals.
(Refer to the Speaker Wiring
Diagrams section of this guide.)
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
on lead is not available, 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.
Status LEDs
2.
- 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.
Ground -
6.
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 Fuses -
3.
4.
These fuses protect
the amplifier against internal elec-
trical damage and are meant to
protect the amplifier only. All other
power connections should be fused
at the source.
(+) 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.
8
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FIGURE 2—AMPLIFIER CONNECTIONS 750d REAR
6
1
2
3
4
5
FUSE
2
30A
x
BATT
REM
GND
POWER
PROTECTION
SUB OUTPUT
FIGURE 3—AMPLIFIER CONNECTIONS 1500d REAR
3
6
1
2
4
5
FUSE
3
30A
x
BATT
REM
GND
POWER
PROTECTION
SUB OUTPUT
9
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TOP PANEL CONTROLS
Input Gain Adjustment
1.
- Controls
frequencies below 30Hz. Frequen-
cies below 30Hz will be attenuated
by 24db per octave.
the amplifier’s sensitivity and is
used to match the input level of the
amplifier to the output level of the
signal source.
Bass EQ Switch
4.
5.
- Adds 8db of addi-
tional boost to the subwoofer
output when active.
Crossover Frequency Adjustment
Adjusts the crossover point for the
on-board low-pass crossover.
2.
3.
-
Sub Phase Switch
- Changes the
phase of the subwoofer output by
180 degrees.
Subsonic Frequency Switch
- Sets
the cutoff point for subsonic
FIGURE 4—AMPLIFIER CONTROLS TOP
GAIN
FREQ
2
1
MIN
MAX
30Hz
ON
250Hz
3
OFF
BASS EQ
OFF
SUBSONIC
ON
4
5
PHASE
0
180
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.
10
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SPEAKER WIRING DIAGRAMS
Single subwoofer connection (top view)
Two subwoofer connection (top view)
NOTE:
The dual + and -- subout terminals of the 750d/1500d are paralleled internally and the combined load impedance should be
taken into consideration when connecting multiple subwoofers.
11
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COMBINING AMPLIFIERS
amplifiers in this combination. Multiple identical
master/slave combinations can be added to any
given system.
The Viper 750d/1500d subwoofer
amplifiers have the capability of
connecting two or more amplifiers of the
same power rating together in a
master/slave combination for increased
power with accurate level matching. They
are the Parallel Synced Gain and External
Synced Bridged combinations.
External Synced Bridged
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 both
amplifiers. This combination allows the
amplifiers to drive common subwoofer
loads while being synced together via an
out-of-phase audio pre-amp signal from the
master amplifier. In this subwoofer wiring
configuration the master amplifier sends the
positive signal to the subwoofer while the
slave amplifier sends the negative signal,
making an externally bridged speaker
connection. (Refer to External Synced
Bridged section of this guide for amplifier
and speaker connection diagrams.)
WARNING: DO NOT attempt to combine amplifiers of different
power ratings. These amplifier combinations work
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 ampli-
fier to control gain, filter, and sub-level
on both amplifiers.
This combination allows the amplifiers to
drive their own separate subwoofer(s)
while being synced together via an in-
phase audio pre-amp signal from the
master amplifier. Wiring connections to
the amplifier subwoofer outputs in this
combination should be standard in-phase
NOTE:
Amplifiers in this combination can only be connected
in matched pairs. Multiple matched pairs may be
added to drive separate subwoofer loads in a given
system.
Combined Amplifiers Gain
and Filter Settings
configurations, creating
a
parallel
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.
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
12
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PARALLEL SYNCED GAIN CONNECTIONS/SETTINGS
Input Signal
jacks as described in the Front Panel
Connection section of this guide.
Signal Connection
- Connect an RCA
1.
- Connect these RCA 4.
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.
Slave/Master Switch
2.
„
Set the slave/master switch
Subwoofer Speaker Connection
5.
- In
on the master amplifier to the
MASTER position.
this amplifier combination each
amplifiers must drive its own sepa-
rate subwoofer(s). Connect the
speaker terminals of each amplifier
to any combination of one or more
subwoofers that results in nominal
impedance between one and four
ohms. Make sure that each amplifier
sees the same speaker impedance.
„
Set the slave/master switch
on the slave amplifier to the SLAVE
position.
„
Setting the slave/master
switch on both amplifiers will auto-
matically set the I/O RCA jack
configuration according to each
amplifier’s slave or master designa-
tion.
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.
Remote Sub Level Control
3.
- 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.
13
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FIGURE 5—PARALLEL SYNC GAINED 750d/1500d
Master
2
1
INPUT
I/O
SLAVE
MASTER
SLAVE IN
SYNC OUT
R
L
REMOTE
BRIDGE OUT
Do Not Use
3
MIN
MAX
4
Slave
SUB LEVEL
INPUT
I/
SLAVE
MASTER
SLAVE IN
SYNC OUT
R
L
REMOTE
BRIDGE OUT
Do Not Use
Do Not Use
2
Subwoofer Wiring (top view)
5
NOTE:
The dual + and -- subout terminals of
the 750d/1500d are paralleled inter-
nally and the combined load impedance
should be taken into consideration when
connecting multiple subwoofers.
14
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EXTERNAL SYNCED BRIDGED CONNECTIONS/SETTINGS
Input Signal
Signal Connection
- Connect an RCA
1.
- Connect these RCA
4.
jacks as described in the Front
Panel Connection section of this
guide.
cable between the BRIDGE OUT RCA
jack of the Master amplifier and the
SLAVE IN RCA jack of the Slave
amplifier as shown in Figure 6.
Slave/Master Switch
2.
Subwoofer Speaker Connection
5.
- In
„
Set the slave/master switch
this amplifier combination the
Subwoofer speaker terminals of
both amplifiers drive common
subwoofer(s). Use the following
speaker connection diagram when
connecting the subwoofers to the
amplifiers. Connect the amplifiers
speaker terminals to any combina-
tion of one or more subwoofers that
results in a nominal impedance
between 2 and 4 ohms. DO NOT
connect loads of less than 2 ohms
when connecting to amplifiers in
the External Synced Bridged combi-
nation.
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 auto-
matically set the I/O RCA jack
configuration according to each
amplifiers slave or master designa-
tion.
NOTE:
Amplifiers in this combination can only be
connected in matched pairs. Multiple matched
pairs may be added to drive separate subwoofer
loads in a given system.
WARNING: Two wires of 12AWG minimum must be
connected between the negative sub out termi-
nals of the master and slave amplifiers.
Remote Sub Level Control
3.
-
Connect the Remote Sub Level
control to the master amplifier
only. The master amplifier gain
control is used to set the overall
gain for both amplifiers, and
then the Remote Sub Level
control can adjust the gain of
both amplifiers.
15
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FIGURE 6—EXTERNAL SYNC BRIDGED 750d/1500d
Master
Do Not Use
2
1
INPUT
I/O
SLAVE
MASTER
SLAVE IN
SYNC OUT
R
L
REMOTE
BRIDGE OUT
3
MIN
MAX
4
Slave
SUB LEVEL
INPUT
I
SLAVE
MASTER
SLAVE IN
SYNC OUT
R
L
REMOTE
BRIDGE OUT
Do Not Use
Do Not Use
2
Subwoofer Wiring
NOTE:
The dual + and -- subout terminals of the
750d/1500d are paralleled internally
and the combined load impedance
should be taken into consideration when
connecting multiple subwoofers.
5
The audio signal to the slave amplifier is
180° out of phase. The subwoofer’s
negative terminal must be connected to
the slave amplifier’s positive terminal.
16
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MULTIPLE AMPLIFIER COMBINATIONS
The Directed 750d/1500d subwoofer
amplifiers can also be used in multiples
of the master/slave combinations
allowing for unlimited expansion to a
systems subwoofer section. To use
multiples of amplifier combinations the
following directions must be adhered to
for best results.
more Directed Remote Sub Level
cable splitters. Standard single-to-
double 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.
Audio signal
„
- Divide the head unit
or processor audio signal to the
master amplifiers 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.
Amplifier configuration
„
- Set up
each master/slave amplifier combi-
nation as described for the combi-
nation type being used. (Refer to
the Parallel Synced Gain or the
External Synced Bridged section of
this guide for amplifier and speaker
connection descriptions.)
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
17
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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 ampli-
fier 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 mate-
rial, 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!
18
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SPECIFICATIONS
Directed model 750d
1500d
275
425
RMS continuous power driven into 4 ohms from 20 to 250
Hz @ 14.4 VDC at rated power/load.
watts
watts
0.4% THD 0.5%
400
800
RMS continuous power driven into 2 ohms from 20 to 250
Hz @ 14.4 VDC at rated power/load.
watts
watts
0.6% THD 0.7%
600
1100
RMS continuous power driven into 1 ohm from 20 to 250
Hz @ 14.4 VDC at rated power/load.
watts
watts
0.8% THD 0.9%
750
1500
watts
Dynamic power rating (IHF-202 Standard) minimum load.
watts
800
1600
watts
RMS continuous power driven into 4 ohms from 20 to 250
Hz @ 14.4 VDC in synced bridge mode (bridged pair).
watts
1200
watts
2200
watts
RMS continuous power driven into 2 ohms from 20 to 250
Hz @ 14.4 VDC in synced bridge mode (bridged pair).
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
Subsonic Filter
Switchable 30 Hz,
24 dB/octave
Bass Equalization
Switchable 8 dB,
centered at 40Hz
Input Impedance
Input Sensitivity
20K ohms
Variable from 150 mV
to 8 volt
Output Impedance
Supply Voltage
1 to 4 ohms
10 to 16 VDC
Fusing and Power
Minimum Cable Requirements (AWG)
(Per amp, trunk mounted)
60A
#8
90A
#4
19
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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 92081
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
© 2003 Directed Electronics, Inc.
-
All rights reserved
-
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