Directed Audio Model 350 Power Amplifier Manual de usuario

OWNER’S MANUAL

Model 350

CONGRATULATIONS

ThankyouforchoosingaDirectedAudio

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-boardcrossovers,and state-of-the-art

audio design, Directed Audio amplifiers

willsatisfyevery 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 by a one year parts-

and-laborlimited warranty. Pleasesave

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.

Theymayalsoimpairadriver’sabilityto

hear traffic sounds or emergency vehi-

cles. Use common sense and practice

safelisteninghabitswhenlisteningtoor

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

Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 8

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 9

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

carchassisorframe,notaseparate

part with poor electrical connection

to the chassis.

7. Always fuse your power connection

atthebattery within 8-10 inches of

thebatteryterminal. Use afuse 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

drawof 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-

datethe extra loadcreated 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. Thisamplifieris designed todrive a

speakerloadthatmeasuresfrom2-

4 ohms. Keep in mind that heat is

thelong-termenemyofautomotive

electronics and that the lower your

speaker load, the more heat

INSTALLATION GUIDELINES (continued)

is generated. For low impedance

speaker applications or restricted

ventilationinstallations,anexternal

cooling fan may be advisable.

9. Your connections to the amplifier’s

speaker and power terminals

shouldbemadewithcrimpedspade

lugs, and the battery and ground

connectionstothevehicleshouldbe

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’tdeliverfulloutputifthepower

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. GROUNDTERMINAL - connectthis

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!

Ifyouaregroundingmultipleampli-

fiers, you may use a high-current

distributionblockwithpropergauge

cables,oruseindividualgroundsfor

eachampattachedtothevehicleat

separate but close ground points.

2. REMOTE TERMINAL - connect this

terminal to the amplifier remote

outputfromyourheadunitorsignal

source or power antenna output

wire from decks that do not have

separate amp remote outputs. 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

pageforpropergaugeofwire.YOU

MUST PROTECT THIS WIRE WITH A

FUSE or circuit breaker located

close to the battery.

4. POWER FUSES - protects the ampli-

fier against electrical damage. DO

NOT REPLACE THE FUSES WITH

LARGER AMPERAGE FUSES ! If the

fuses blow, check your system for

wiring problems or see your dealer.

5. SPEAKER OUTPUT TERMINALS -

Refer to the speaker wiring

diagrams (pg.6) for different

wiring options.

6. SUBWOOFER OUTPUT - connect

the subwoofer to these terminals.

AMPLIFIER CONNECTIONS

Refer to Figure 1 for details.

FIGURE 1—AMPLIFIER CONNECTIONS

1. RCA INPUT JACKS - accepts line-

level outputs from head units or

signal sources at voltages from

200mV to 8 volts.

2. GAIN ADJUSTMENT - controls the

gain (input sensitivity) of the

amplifier.Eachcontrolsetsthegain

for that half of the amplifier.

3. CROSSOVER SELECTION SWITCH -

controls the type of filter for each

of two on-board active crossovers.

Set crossover switches for proper

filter type depending on system

configuration.

4. REMOTE SUB LEVEL - controls the

subwoofer output level

5. SUBWOOFER LOW-PASS

CROSSOVER - use the gain and

crossover frequency controls to

adjust the subwoofer output.

6. BASS EQ - This switch activates an

8dB bass boost circuit. Use as

necessary for low frequency

enhancement.

7. CROSSOVERFREQUENCY-controls

the frequency range of the ampli-

fier. Each half of the amplifier can

be set independently for optimum

performance.

8. LED INDICATOR - the green Power

LEDlightstoindicatenormalopera-

tion. ThegreenLEDwill 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

For bridged three channel operation as shown in this diagram, connect right channel

RCAcablestothe “FRONT” inputsof the amplifier, and leftchannelRCA cables tothe

“REAR” inputs of the amplifier.

Five channel operation

Three channel operation

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 normal complete system applications, the crossover selection switches should be

set to "HPF".

• The crossover frequency controls need to be adjusted to suit your particular system.

For subwoofer applications, try and keep the setting low enough to prevent image

smearing(youshouldnotbeabletohearmalevoicesfromthesubwoofer)butnotso

lowas to createa gap betweenthesubwoofer andthemid-bass/midrange speakers.

For mid-bass/midrange settings, try to keep the frequency low enough to keep your

soundstageinfrontofyou, without overdriving thespeaker. It will be toyouradvan-

tage to spend some extra time with these adjustments, listening to familiar music or

system set-up discs to achieve the kind of musical reproduction that you prefer.

• The gain adjustments allow you to set proper signal match for clean, quiet amplifier

operation. For full-range and simultaneous stereo/mono bass applications, start by

playingsomemusic youarefamiliar with. With the gainadjustmentson the amplifier

in the middle of their 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 settings

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

untilthe distortion is not audible. This setting will allowyou to reach full output with

all but the quietest of source material, while avoiding excessive noise in the system.

You may need to set the rear channels gain control lower to maintain a good sound

stage.

• The same procedure should be used for adjusting the amplifier when the on board

crossover is set to LPF or FLAT, but you will also have to take into consideration the

effect that gain adjustment has on system frequency response and imaging. Again,

planonspendingsometimewithmusicthat you know getting thegainandcrossover

settingstheway youlike. Test discs andanalyzersmay helpwiththis process, butin

the end it's your ears that count - listen to the music !

SPECIFICATIONS

RMScontinuouspowerperchannel,Channels 1-4 driven into4 ohms

from20to20,000Hz,withlessthan0.08%totalHarmonicDistortion

@14.4VDC.Channel5driveninto4ohmsfrom20-250Hz,withless

than0.08% THD@ 14.4VDC.

RMScontinuous powerper channel,Channels 1-4 driveninto 2 ohms

from 20 to 20,000 Hz, with less than 0.1% Total Harmonic Distortion

@14.4VDC.Channel5driveninto2ohmsfrom20-250Hz,withless

than0.1% THD@ 14.4VDC.

RMScontinuouspower,3-channeloperation,channels1-4bridgedinto

4 ohms from 20 to 20,000 Hz, with less than 0.1% Total Harmonic

Distortion @ 14.4 VDC. Channel 5 driven into 2 ohms from 20-250

Hz,with lessthan 0.1%THD @ 14.4VDC.

Dynamicpower rating(IHF-202 Standard) at

minimumload

35 100

watts watts

50 150

watts watts

ch 1-4 ch 5

450 watts

100x2 150

watts watts

Signal-to-NoiseRatio Greater than95 dB

FrequencyResponse 20-20,000 Hz± 0.5dB

DampingFactor @4 ohm Greaterthan 200

Crossover Switchablehigh orlow pass

12dB/octave, continuously

variable50 to500 Hz

SubwooferCrossover Low pass12 dB/octave,

variable50 to250Hz

BassEqualization +8 dB,centered at40Hz

InputImpedance 20K ohms

InputSensitivity Variablefrom150 mVto 8volt

OutputImpedance (ch1-4) 2 to8 ohms, stereo

4to 8ohms, bridged

(ch5) 2 to4 ohms

SupplyVoltage 10to16 VDC

Fusingand Power 50A

CableRequirements (AWG) #10

(Peramp, trunk mounted)

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