Directed Electronics 250 User Manual

OWNER’S MANUAL  
Models 150/250/400  
TABLE OF CONTENTS  
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 2  
Amplifier Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 4  
Amplifier Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 5  
Speaker Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . .Page 6  
Crossover Setting and Gain Adjustment . . . . . . . . . . . . . . . .Page 7  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 8  
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 9  
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.  
1
© 1999 Directed Electronics, Inc  
INSTALLATION GUIDELINES  
1. Please read the owner’s manual  
carefully before you install the  
amplifier.  
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 amplifiers.  
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. Make sure  
that the metal area is part of the  
car chassis or frame, not a separate  
part with poor electrical connection  
to the chassis.  
7. Always fuse your power connection  
at the battery within 8-10 inches of  
the battery terminal. Use a fuse or  
circuit breaker rated at about 5-10  
more amps 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  
autosound competition organiza-  
tions 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. It is a good  
idea to 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 upgrade it to a  
gauge of wire that can accommo-  
date the extra load created by your  
amplifier installation. 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-  
8 ohms. Keep in mind that heat is  
the long-term enemy of automotive  
electronics and that the lower your  
speaker load, the more heat  
2
© 1999 Directed Electronics, Inc  
INSTALLATION GUIDELINES (continued)  
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 used in all  
Directed Audio amplifiers, 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. Your connections to the amplifier’s  
speaker and power terminals  
should be made with crimped spade  
lugs, and the 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.  
3
© 1999 Directed Electronics, Inc  
AMPLIFIER CONNECTIONS  
Refer to Figure 1 for details.  
not connect this terminal to a  
constant source of +12V.  
1. GROUND TERMINAL - connect this  
terminal to the car chassis with a  
short heavy gauge wire, DO NOT  
CONNECT TO THE NEGATIVE  
TERMINAL OF THE CAR BATTERY or  
to factory chassis ground points  
already occupied by factory wires! If  
you are grounding multiple ampli-  
fiers, you may use a high-current  
distribution block with proper gauge  
cables, or use individual grounds for  
each amp attached to the vehicle at  
separate but close ground points.  
2. REMOTE TERMINAL - connect this  
terminal to the amplifier remote  
output from your head unit or signal  
source, if it provides one. You may  
also use the power antenna output  
wire from decks that do not have  
separate amp remote outputs. This  
input requires a switched +12V  
signal to activate the amplifier. Do  
3. +12V POWER TERMINAL - connect  
this terminal to the positive terminal  
of the car or separate audio system  
battery. Refer to the installation  
guidelines and specs page for proper  
gauge of wire. YOU MUST PROTECT  
THIS WIRE WITH A FUSE or circuit  
breaker located close to the battery.  
4. POWER FUSE - protects the ampli-  
fier against electrical damage. DO  
NOT REPLACE THE FUSE OR FUSES  
WITH LARGER AMPERAGE FUSES !  
If the fuse(s) blows, check your  
system for wiring problems or see  
your dealer.  
5. SPEAKER OUTPUT TERMINALS  
connect the speakers to these termi-  
nals. Refer to the speaker wiring  
diagrams (pg.6) for different wiring  
options.  
FIGURE 1—AMPLIFIER CONNECTIONS  
4
© 1999 Directed Electronics, Inc  
AMPLIFIER CONTROLS  
Refer to Figure 2 for details.  
1. RCA INPUT JACKS - accepts line-  
level outputs from head units or  
signal sources at voltages from  
200 mV to 8 volts. High-grade  
shielded or twisted pair RCA cables  
are recommended for this input.  
2. GAIN ADJUSTMENT - controls the  
gain (input sensitivity) of the  
amplifier.  
4. LED INDICATOR - the green Power  
LED lights to indicate normal opera-  
tion. The green LED will shut off to  
indicate amp shutdown due to  
short circuit, DC offset, or over-  
current conditions detected by on-  
board protection circuits. Thermal  
protection is also indicated by the  
green LED shutting off.  
5. CROSSOVER FREQUENCY- controls  
the frequency range of the ampli-  
fier.  
6. BASS EQ - this switch activates an  
8 dB bass boost circuit. Use as  
necessary for low frequency  
enhancement.  
3. CROSSOVER SELECTION SWITCH -  
controls the type of filter for the on-  
board active crossover. LPF setting  
is for low-pass (subwoofer) output  
frequencies, HPF is for high-pass  
(mid-bass/midrange) outputs.  
FLAT is used for full-range or mixed  
stereo/mono applications.  
FIGURE 2—AMPLIFIER CONTROLS  
5
© 1999 Directed Electronics, Inc  
SPEAKER WIRING DIAGRAMS  
Stereo operation  
Mono operation  
Simultaneous stereo/mono operation  
6
© 1999 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.  
• 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 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.  
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 advan-  
tage 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. 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 ampli-  
fier 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 !  
7
© 1999 Directed Electronics, Inc  
SPECIFICATIONS 150/250/400  
model 150  
250  
400  
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  
125  
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  
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  
75  
watts  
125  
watts  
200  
watts  
150  
watts  
250  
watts  
400  
watts  
200  
watts  
325  
watts  
550  
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  
Input Impedance  
Input Sensitivity  
Output Impedance  
+8 dB, centered at 40Hz  
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  
Fusing and Power  
Cable Requirements (AWG)  
(Per amp, trunk mounted)  
20A  
#12  
25A  
#10  
50A  
#8  
8
© 1999 Directed Electronics, Inc  
LIMITED TWO YEAR CONSUMER WARRANTY  
®
Directed Electronics, Inc. (DEI ) 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 DEI dealer. During this two year  
period, there will be no charge for this  
replacement PROVIDED the unit is returned  
to DEI, shipping pre-paid. If the unit is  
installed by anyone other than an autho-  
rized DEI 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 DEI, ship-  
ping pre-paid. This warranty is non-transfer-  
able 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 PARTIC-  
ULAR PURPOSE, AND WARRANTY OF  
NON-INFRINGEMENT OF INTELLECTUAL  
PROPERTY ARE EXPRESSLY EXCLUDED TO  
THE MAXIMUM EXTENT ALLOWED BY  
LAW, AND DEI NEITHER ASSUMES NOR  
AUTHORIZES ANY PERSON TO ASSUME  
FOR IT ANY LIABILITY IN CONNECTION  
WITH THE SALE OF THE PRODUCT. DEI  
HAS ABSOLUTELY NO LIABILITY FOR ANY  
AND ALL ACTS OF THIRD PARTIES  
INCLUDING ITS AUTHORIZED DEALERS  
OR INSTALLERS. Unit must be returned to  
DEI, 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 DEI  
DEALER. ALL UNITS RECEIVED BY DEI FOR  
WARRANTY REPAIR WITHOUT PROOF OF  
DEI 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 reinstallation of the unit. BY  
PURCHASING THIS PRODUCT, THE  
CONSUMER AGREES AND CONSENTS THAT  
ALL DISPUTES BETWEEN THE CONSUMER  
AND DEI SHALL BE RESOLVED IN ACCOR-  
DANCE WITH CALIFORNIA LAWS IN SAN-  
DIEGO COUNTY, CALIFORNIA.  
9
© 1999 Directed Electronics, Inc  
OTHER PRODUCTS AVAILABLE FROM:  
CLASS D MONO AMPLIFIERS  
®
2 CHANNEL AMPLIFIERS  
4 AND 5 CHANNEL AMPLIFIERS  
SIGNAL PROCESSORS  
TUBE SUBWOOFERS  
POWERED SUBWOOFERS  
SINGLE AND DUAL VOICE COIL SUBWOOFERS  
COAXIAL SPEAKERS  
SINGLE AND DUAL VOICE COIL SUBWOOFERS  
COAXIAL SPEAKERS  
COMPONENT SPEAKER SYSTEMS  
SINGLE AND DUAL VOICE COIL DIE-CAST SUBWOOFERS  
COMPONENT NEODYMIUM SPEAKER SYSTEMS  
SINGLE AND DUAL VOICE COIL DIE-CAST SUBWOOFERS  
HIGH PERFORMANCE POWER CABLES  
PREMIUM SPEAKER/AUDIO CABLES AND ADAPTERS  
POWER CAPACITORS  
GOLD-PLATED POWER DISTRIBUTION AND FUSING BLOCKS  
GOLD-PLATED POWER AND SPEAKER TERMINALS  
Always use a  
DEI is a proud member of  
G45022 9/99  
© 1999 Directed Electronics, Inc • Vista, CA 92083 • All Rights Reserved  

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