Directed Audio 250d Manuale utente

OWNER’S MANUAL

Model 250d

CONGRATULATIONS

Thank you for choosing a Directed Audio

power amplifier. Directed has been the

leader in high-quality and innovative

security products in the U.S. since

1990. Now we introduce to the car

audio industry the same winning

formula - products that meet the strin-

gent standards of today’s mobile elec-

tronics enthusiast yet priced for

anyone’s budget. Featuring high-effi-

ciency MOSFET power supplies, flexible

on-board crossovers, and state-of-the-art

audio design, Directed Audio amplifiers

will satisfy every music lover’s needs for

years to come. Your Directed Audio

power amplifier comes with a two year

limited warranty if it is installed by an

authorized DEI dealer. Amplifiers not

installed by an authorized Directed

dealer are covered are covered by a one

year parts-and-labor limited warranty.

Please save your sales receipt and refer

to the warranty section of this manual

for complete details.

TABLE OF CONTENTS

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.

WARNING

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

INSTALLATION GUIDELINES

1. Please read the owner’s manual

carefully before you install the ampli-

fier.

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-

4 ohms. Keep in mind that heat is

the long-term enemy of automotive

electronics and that the lower your

speaker load, the more heat

INSTALLATION GUIDELINES (continued)

is generated. For low impedance

speaker applications or restricted

ventilation installations, an external

cooling fan may be advisable.

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.

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.

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

not connect this terminal to a

constant source of +12V.

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. SUBWOOFER OUTPUT TERMINALS

- connect the speakers to these

terminals. Refer to the speaker

wiring diagrams (pg. 6) for

different wiring options.

AMPLIFIER CONNECTIONS

Refer to Figure 1 for details.

FIGURE1—AMPLIFIER CONNECTIONS

1. RCA OUTPUT JACKS - use these

jacks to route the input signal to

another amplifier.

2. RCA INPUT JACKS - accepts line-

level outputs from head units or

signal sources at voltages from

200 mV to 8 volts.

3. GAIN ADJUSTMENT - controls the

gain (input sensitivity) of the

amplifier.

4. PHASE INVERT SWITCH - controls

the output phase of the amplifier.

The signal is inverted with the

switch set to 180.

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.

7. LED INDICATOR - the green Power

LED lights to indicate normal opera-

tion. The green LED will shut off to

indicate amp shutdown due to

thermal, short circuit, DC offset, or

over-current conditions detected by

on-board protection circuits.

AMPLIFIER CONTROLS

Refer to Figure 2 for details.

FIGURE 2—AMPLIFIER CONTROLS

SPEAKER WIRING DIAGRAMS

Speaker nominal impedance must be at

least 2 ohm. Amplifier parallels the

speaker terminals internally.

Single subwoofer connection

Two subwoofer connection

Parallel speaker nominal impedance must

be at least 2 ohm. Amplifier parallels the

speaker terminals internally.

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 the 250d is only suited for subwoofer applications, the low-pass crossover is

active at all times. The crossover point is adjustable to allow more precise system oper-

ation.

• 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 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. Start by playing some music you are familiar with. With the gain adjust-

ment 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.

• 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 !

SPECIFICATIONS

RMS continuous power driven into 4 ohms

from 20 to 250 Hz with less than 0.4% Total

Harmonic Distortion @ 14.4 VDC

RMS continuous power driven into 2 ohms

from 20 to 250Hz with less than 0.6% Total

Harmonic Distortion @ 14.4 VDC

Dynamic power rating (IHF-202 Standard) at

minimum load

125 watts

300 watts

250 watts

model 250d

Signal-to-Noise Ratio Greater than 80 dB

Frequency Response 20-250 Hz +0, -1 dB

Damping Factor 50 (typical)

Crossover Low-pass 12 dB/octave

variable from 30 to 250 Hz

Bass Equalization +8 dB, centered at 40Hz

Input Impedance 20K ohms

Input Sensitivity Variable from 150 mV to 8 volt

Output Impedance 2 to 4 ohms

Supply Voltage 10 to 16 VDC

Fusing and Power 20A

Cable Requirements (AWG) #12

(Per amp, trunk mounted)

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