Interfire Audio Inc Car Amplifier D900 1 User Manual

MONO CHANNEL CLASS "D"  
AUTOMOTIVE AMPLIFIER  
D900.1 / D1700.1 / D3000.1  
INSTRUCTION MANUAL  
CONGRATULATIONS ON YOUR PURCHASE  
Your new high fidelity mono block amplifier is designed to deliver maximum enjoyment  
and one year of trouble free service. Please take a few moments to read this manual  
thoroughly. It will explainthe features andoperation of yourunit and helpinsure trouble  
free installation.  
FEATURES  
• Class ''D''Technology  
• 1 OhmStable  
• Spec Audiophile Grade Components  
• High Efficiency PWM PowerSupply  
- Multi-stranded powertoroid  
- Tow toroidal core  
- MOSFET transistors  
• Oversized CapacitorBanks  
• Discrete MountPower and speakerterminals  
• Variable Low PassElectronic Crossover 50Hz- 250Hz  
• Built inpower bridging module  
• Circuit /Thermal / Overload Protection  
• Remote LevelControl  
IMPORTANT  
PLEASE READ ALL INSTRUCTIONS BEFORE INSTALLATION !  
The quality of installation may affect the performance and reliability of your product. If  
you have any doubts or questions regarding installation, you may wish to contact your  
authorized dealer. Remember to heed all wire and fuse requirements suggested in this  
manual. Warranty may be void if proper installation technique is not used (refer to warranty  
section in the rearof the manual )  
1
INSTALLATION  
MOUNTING:  
1. After reading precaution, decide where you are going to install the unit. Also, see Fig.1.  
2. Once thelocation has beendetermined, place theamplifier into position. Using a felttip  
pen or pencil mark the four holes to be drilled for mounting. NEVER use the amplifier as  
a template for drilling. It is very easy to damage the amplifier surface in this manner.  
3. Remove amplifier. Drill four 3.5 m/m holes into mounting surface. If you want to mount  
the amplifier to MDF or wood panel, drill four 3.0m/m diameter holes into mounting surface.  
4. If possible, test the system to ensure it is operating correctly before final mounting of  
the amplifier.  
Mount the amplifier using the supplied 4 self tapping screws.  
5.  
INSTALLATION DIAGRAM  
Self Tapping Screws  
FIG.1  
2
SPEAKER WIRING  
The Class "D" amplifier is a SINGLE CHANNEL dedicated subwoofer amplifier. Unlike  
other amplifiers, the Class "D" operates as a single channel and cannot be bridged.  
Don't be fooled by the outputs. Two outputs are used strictly for convenience and are  
paralleled internally on the amplifier. This means that if both outputs are used with one  
driver each, the amplifier sees the same load as if the same drivers are connected to  
only one outputterminal. See diagrambelow.  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
ON  
PROTECT  
4OHM  
4OHM  
SUBWOOFER  
SUBWOOFER  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
ON  
PROTECT  
4OHM  
4OHM  
SUBWOOFER  
SUBWOOFER  
In both diagrams, the amplifiersees a 2 ohm load.  
3
MONO BRIDGED  
MASTER SLAVE  
Master  
Amplifier  
MASTER SLAVE  
L
6V 0.2V 50Hz 250Hz 0dB 12dB  
GAIN  
L.P.F  
BASS  
BOOST  
REMOCON  
SLAVE  
R
LINE INPUT  
FROM  
RADIO  
MASTER SLAVE  
Slave  
Amplifier  
MASTER SLAVE  
L
6V 0.2V 50Hz 250Hz 0dB 12dB  
GAIN  
L.P.F  
BASS  
BOOST  
REMOCON  
SLAVE  
R
LINE INPUT  
WIRING SUBWOOFERS (DUAL AMPS)  
When using dual amplifiers to power one subwoofer, the Positive terminal of the Subwoofers  
voice coil is connected the positive terminal of the MASTER Amplifier and the Negative terminal  
of the Subwoofers voice coil is connected to Positive terminal on the SLAVE Amplifier. This  
procedure will allow the total power of both amplifiers to be added together and act like a single  
powerful amplifier. Please check that your subwoofer power handling capabilities are not exceeded  
when hooking two amplifiers to it.  
CAUTION  
Always check your speaker load with a multi-meter before hooking up to the amplifier. These  
digital amplifiers are only 1 ohm stable. Any Impedance (load) smaller than 1 ohm will damage  
the amplifier. SuchDamage is not covered underwarranty either, sopay strict attention to what  
connections are madeto the amplifier.  
4
MONO BRIDGED  
Master  
Amplifier  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
ON  
PROTECT  
Using a lead wire of 8 gauge or  
bigger connect from the master  
Amp's negative(-) speaker  
terminal to the slave Amp's  
negative(-) speaker terminal.  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
Slave  
Amplifier  
ON  
PROTECT  
BATTERY VIA FUSE  
CHASSIS GROUND  
REMOTE TURN ON  
(OPTION) TWO AMPLIFIER/ ONESUBWOOFER (SINGLE VOICE COIL)CONFIGURATION  
Master  
Amplifier  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
ON  
PROTECT  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
Slave  
Amplifier  
ON  
PROTECT  
Recommend : Competition Only  
5
MONO BRIDGED  
(OPTION) FOUR AMPLIFIER/ ONESUBWOOFER (DUAL VOICE COIL)CONFIGURATION  
Master  
Amplifier  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
ON  
PROTECT  
Voice  
Coil1  
Voice  
Coil2  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
Slave  
Amplifier  
ON  
PROTECT  
Master  
Amplifier  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
ON  
PROTECT  
SPEAKER  
FUSE  
POWER  
REM  
+12V  
GND  
Slave  
Amplifier  
ON  
PROTECT  
6
POWER SUPPLY CONNECTIONS  
The Class "D" amplifier is designed to work within 10 to 16 volts DC. Before any wires  
are connected, the vehicle's electrical system should be checked for correct voltage  
supply with the help of a voltmeter. First check the voltage at the battery terminals with  
the ignition in the off position. The voltmeter should read no less than 12 volts. Next,  
check the battery with the engine running between 1500 and 2000 rpm. The voltmeter  
should now read between 13.5 and 14.5 volts. If your vehicle's electrical system Is not  
up to these specifications, we recommend having it checked by an automotive mechanic  
before further installation.  
RECOMMENDED POWER WIRE  
The proper wire size is very imporat nt for an amplifier of this power level. Because the  
Class "D" amplifier is capable of drawing in excess of 90 amperes,4 gauge wire is  
recommended for lengths up to twenty feet. if a longer length is neede,da larger gauge  
wire may be necessary.  
POWER  
Amplifier power wire should be wired directly to the battery using the wire requirements  
listed above. Start at the amplifier and run the power wire through the vehicle to the  
battery. The use of grommets is recommended when passing the power wire through  
any metal wall. Avoid sharp corners or sharp body parts that may easily cut through the  
insulation on the wire. Avoid running the power wire over engine components and near  
heater cores. Use an inline fuse to eliminate the risk of a fire caused by a short in yoru  
power wire. Connect the fuse holder as close to the battery positive as possible. For  
most applications, an 80 ampere Maxi fuse or comparable ANL wafer fuse can be used.  
Now connect the wire to the battery, but remember to leave the fuse out untli all other  
wire connections are mode.  
GROUND  
When grounding your amplifier, locate a metal area close to the amplifier that is a good  
source of ground ( preferably the floor ).Once again, investigate the area you wish to use  
for electrical wires, vacuum lines, and brake or fuel lines. Using either a wire brush or  
sandpaper eliminate unwanted paint to supply a better contact for your ground. Use the  
same gauge wire for ground as you did for the power. Terminate the ground wire using the  
correct size ring terminal and attach it to the bare metal using a nut and bolt. It is important  
for this connection to be solid. To complete the job, spread silicon over the screw and bare  
metal to prevent rust and possible water leaks.  
REMOTE TURN-ON  
In between the power and ground is a remote turn-on terminal. This terminal must be  
connected to a switched +12volt source. Typically, remote turn-on leads are provided  
at the source unit that will turn on and off the amplifier in correspondence with the source.  
If a radio does not have a remote turn-on, then a power antenna wire may be used. Yet, if  
neither of these leads are available at the source, a switched +12 volt supply must be  
supplied. Run a minimum of 18-gauge wire from the amplifier location to the source of the  
switched +12 volt lead. If possible, route this wire on the same side of the vehicle as your  
power wire. Connect the source remote output wire to the REM terminal on the amplifier  
using a 3mm screw key. Cut the remote wire to length. Strip approximately 1/2 inch of  
insulation from theend of thewire and insertinto the terminal. Tighten thescrew securely.  
7
OPERATION  
1
2
3
4
5
6
7
MASTER SLAVE  
L
6V 0.2V 50Hz 250Hz 0dB 12dB  
GAIN  
L.P.F  
BASS  
BOOST  
REMOCON  
SLAVE  
R
LINE INPUT  
1. RCA Input Jacks  
4. Bass Boost  
5. Remote Control Jack 6. Master/Slave Switch  
2. Input Level Control  
3. Low Pass Frequency  
7. Slave Input Jack  
Control and Crossover  
1. RCA Input Jacks - Low level-high impedance inputs. Use high quality RCAcables designed  
for mobile applications.  
2. Input Level Control - Adjust the input level for the marked channels. Turn clockwise to  
increase the level, counterclockwiseto decrease. Amplifiers will run cooler and produce  
less system noise at lower level settings.  
3. Low Pass Frequency - Adjust the crossover frequency byturning clockwise to set to a higher  
frequency, counterclockwiseto set to a lower frequency.  
4. Bass Boost - Adjust the sub boost level of the selected frequency outputfrom 0dB to 12dB.  
5. Remote Control Jack - For connecting the remote control module to the amplifier.  
6. Master/Slave Switch -Select the remote level control or the on-board level control as the  
master control.  
7. Slave Input Jack - Used to connect to another amplifier when bridging 2 amps together.  
The Slave mode bypasses normal input jacks and controls.  
8
FRONT/REAR PANEL  
MASTER SLAVE  
L
6V 0.2V 50Hz 250Hz 0dB 12dB  
GAIN  
L.P.F  
BASS  
BOOST  
REMOCON  
SLAVE  
R
LINE INPUT  
D900.1, D1700.1, D3000.1  
SPEAKER  
FUSE  
25A  
POWER  
REM  
25A  
25A  
+12V  
+12V  
+12V  
GND  
GND  
GND  
ON  
PROTECT  
D900.1  
D900.1  
SPEAKER  
FUSE  
30A  
POWER  
REM  
30A  
30A  
ON  
PROTECT  
D1700.1  
D1700.1  
SPEAKER  
POWER  
REM  
ON  
PROTECT  
D3000.1  
D3000.1  
9
TROUBLE SHOOTING GUIDE.  
This section providesyou with acatalog of amplifiersymptoms and theirprobable causes  
and solutions. Beforeyou consult thislisting, make surethe vehicle's electricalsystem is  
working properly byverifying that otherelectrical items (e. g. headlights, windows, etc.)  
Still function correctly.  
SYMPTOM  
PROBABLE CAUSE  
SOLUTION  
No Audio  
Low or N.C Remote  
Turn-on connections  
Check remote turn-on voltage at  
amp and head unit  
Blown Fuse  
Power wires not connected  
Replace with new fast-blow fuse  
Check butt splices or solder joints  
Check ground and battery  
connections  
Blown or non speakers  
connected  
Use VOM or DVM to measure speaker  
coil  
impedance; check speaker wiring  
connections  
Distorted Audio  
Input Sensitivity not set  
properly  
or damaged speaker cones  
See adjustment procedure and check  
each step;  
Inspect each speaker for damage  
and repair or replace suspected  
component  
Low turn-on voltage  
Refer to head unit owner's manual  
Audio Level Low  
Audio Lacks  
Mute circuit on head  
unit is on.  
Check electrical system for low  
voltage;  
Check ground connection  
Speakers wired with wrong  
polarity, causing  
cancellation of bass  
frequencies  
Check polarity of wires from  
amplifiers to each speaker as defined  
by the system design  
Check battery voltage at amplifier  
during operation  
External Fuse  
Blowing  
Incorrect wiring or short  
circuit  
Refer to electrical installation and  
check each installation step  
Whining noise  
on audio with  
engine running  
Amplifier is picking  
up alternator noise  
Install an in-line noise filter on the  
head unit's power wire; Check  
alternator routing diodes or voltage  
regulator for proper operation. Check  
all grounds , battery voltage, and  
RCA cables  
Ticking noise on  
audio with  
engine  
Amplifier is picking up  
radiated spark noise  
Check RCA audio cable; Install an  
in-line noise filter on the head unit's  
power wire. Check spark plug wires.  
running  
10  
SPECIFICATION  
AMPLIFIER  
D900.1  
D1700.1  
D3000.1  
RMS POWER / 1 ohm @ 1% T.H.D  
2 ohms @ 0.05% T.H.D  
900W x 1  
650W x 1  
350W x 1  
90%  
1700W x 1  
1000W x 1  
500W x 1  
90%  
3000W x 1  
2000W x 1  
1000W x 1  
90%  
4 ohms @ 0.05% T.H.D  
Efficiency / Typical @ 4 ohms  
MIN RATE @ 1 ohm  
79%  
79%  
79%  
Bandwidth ±1dB  
10Hz ~ 250Hz  
>100dB  
150  
10Hz ~ 250Hz  
>100dB  
10Hz ~ 250Hz  
>100dB  
Signal ToNoise Ratio ('A' WTD)  
Damping Factor  
Input Sensitivity  
Input Impedance  
150  
150  
200mV ~ 6V  
200mV ~ 6V  
200mV ~ 6V  
20K Ohms  
75Amp  
20K Ohms  
90 Amp  
20K Ohms  
EXTERNAL  
Circuit Breaker  
Dimensions (W x H x D) mm  
Crossover Selector Switch  
257 x 56 x 320  
257 x 56 x 350  
257 x 56 x 420  
Variable  
50 ~ 250Hz  
Variable  
50 ~ 250Hz  
Variable  
50 ~ 250Hz  
Variable Low Pass Filter  
X-Over Slope  
24dB  
24dB  
24dB  
20 ~ 50Hz @ 24dB 20 ~ 50Hz @ 24dB 20 ~ 50Hz @ 24dB  
Variable Subsonic Filter  
NOTE : Specifications & design subject to change without notice  
for improvements.  
11  
Interfire Audio, Inc.  
Santa Fe Springs, CA 90670  
Printed in Korea  

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