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Installation Instructions

Below is a very abbreviated set of installation instructions. This is not meant as a step by step procedure but is 
intended to give you a general idea of what is involved and which steps come first. Every installation will be 
different and may require reordering of these steps. NEVER install the fuse at the battery or connect the negative 
battery cable until all your connections are final.

Before you start, disconnect the negative cable from any batteries in the car. Tape up the end so it is isolated from 
the battery.

Run an appropriate gauge wire from the battery to the amplifier. Plan this part of the installation carefully. This 
cable will carry very high current. If it should short to the body and it is not properly fused it could catch fire. 

You 

DID use a grommet when you ran it through the firewall, didn’t you?

Connect the power wire to the battery using a fuse capable of the total current load of all amplifiers connected. 

Don’t install the fuse yet. 

Wait until the end. Locate the fuse as close as possible to the battery. If the fuse is 

further than 18 inches (wire length) from the battery, you should reevaluate the wire and fuse placement.

Find the closest clear metal area to the amp for a ground. Sand, grind or scrape all paint and undercoating from the 
body and screw the ground securely in place. A nut, bolt and lock washer is advisable here.

It is advisable to test the ground with an Ohmmeter between the ground cable and the negative battery cable to 
insure a good low resistance connection. Some alloys used in modern cars do not offer the best ground. If you 
believe this is the case, consult with the vehicle’s manufacturer.

Run the speaker wire to the speakers. It is advised that you leave some extra wire at this point. You can “clean it up” 
later.

If you haven’t already done so, mount the amp now.

Connect the power and ground to the amplifier. 

Only after this step should you install the fuse at the battery.

Connect the remote wire from the head unit to the amplifier.  Now is a good time to turn on the amp for the first 
time. Make sure it turns on properly and does not go into protection.

Connect the speaker wires to the amp and speakers (make sure the amp is off first). Make sure the polarity (+ and -) 
is correct.

Connect the RCA signal wires to the amp.

Double check the amplifier controls at this time. Make sure everything is set correctly for your system.

Now you’re ready to play it for the first time. It is best to leave the gain all the way down at first. Start with the head 
unit volume low and work your way up.

Now you can tune the amp. Take your time and make only one adjustment at a time. It may take some time to get 
the system fully adjusted. During this time the amp is drawing current from the battery. You should check the 
battery voltage from time to time and re-charge it if it gets low.  That’s it. You’re done.  Now have fun.

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Summary of Contents for XDi 850.5

Page 1: ...with a little effort it will lift off The majority of the controls can then be easily accessed XDi 850 5 Full Range Class D Amplifier www arcaudio com OWNER S MANUAL Introduction 1 Finding a Suitable Location 1 Supplying Power 1 The Ground 1 Running the Cables 2 Class D amplifiers 2 Diagnostic Fault Codes 2 Controls and Features Inputs 3 Gains 3 Crossovers 3 Remote Level Control 3 Bass Boost 4 Ohm...

Page 2: ...low for proper heat dissipation Warning We build all ARC Audio products to play at high volumes for extended periods of time Your ears however are not designed for high volume listening This product can easily generate volumes that can permanently damage your hearing We urge you to limit your exposure to very high volume sound You may also find your state has laws governing the volume of an audio ...

Page 3: ...een or tarnished look you would expect with copper Aluminum also has a greater rate of expansion do to heat and care must be taken to insure that the connection is not over tightened This can result in the failure of the power or ground connector and possibly the circuit board Recommendations for all Class D amplifiers Class D amplifiers by the nature of there design emit a certain amount of RF Ra...

Page 4: ...e a throttle It makes the amp more sensitive to input from the stereo With the gain up the amp will reach full output at a lower volume setting on the deck At higher gain settings the amp also becomes more sensitive to noise from the car s electrical system Try to run the gain at the lowest setting possible for you system There is no correct gain setting Because speakers require different power de...

Page 5: ...aker outputs It is equipped with a removable plug style terminal for speaker wire connections up to 14 AWG Make this connection carefully and neatly Strip your wire back 5 16 and twist the exposed leads and insert them into the block terminal while being careful that there is no loose or frayed strands of wire Tighten the standard head screw down on the terminal until the wire is tightly secured i...

Page 6: ... nut bolt and lock washer is advisable here It is advisable to test the ground with an Ohmmeter between the ground cable and the negative battery cable to insure a good low resistance connection Some alloys used in modern cars do not offer the best ground If you believe this is the case consult with the vehicle s manufacturer Run the speaker wire to the speakers It is advised that you leave some e...

Page 7: ...OAD WILL BE 2 OHM STEREO From Head Unit Subwoofer Output From Head Unit Rear RCA Output From Head Unit Front RCA Output 5 CHANNEL STEREO 4 CHANNEL HIGH PASS W SUB XDi 850 5 Set to HIGH Use this Crossover for HIGH Use this Crossover for SUB Set to HIGH Use this Crossover for HIGH 6 Top ...

Page 8: ...t work perfectly the first time it is recommended that you find an alternative remote trigger immediately From Head Unit Right Front Speaker Output From Head Unit Left Front Speaker Output From Head Unit Right Rear Speaker Output From Head Unit Left Rear Speaker Output From Right Subwoofer Output if Present From Left Rear Subwoofer Output if Present R L 100Ω 100Ω 100Ω 100Ω 100Ω 100Ω All XDi amplif...

Page 9: ...ages for personal injury This warranty gives you specific legal rights and you may have other rights which vary from state to state This warranty applies to products sold and used in the United States of America In all other countries please contact your distributor SPECIFICATIONS Total Harmonic Distortion 02 THD 08 THD Total Harmonic Distortion 02 THD 08 THD Total Harmonic Distortion 06 THD 05 TH...

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