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Ohm Loads

This amplifier operates in the traditional sense with regard to Ohm loads. Lowering the Ohm load will increase power 
output however it will also increase current draw and produce more heat. This amplifier is capable of running any mix or 
combination of Ohm load on the front and rear channels. They do not have to be the same. 

Any speaker or combination of speakers with a total combine Ohm load between 2 and 4 Ohms can be used on any single 
channel. 

Bridged loads 

must not drop below 4 ohms

 but my exceed 8 Ohms if needed. This will not damage the amplifier however 

power output will decrease at higher load. 

WARNING: This amplifier will not operate and could be 
damaged if used in the wrong configuration. At no time 
can it be operated below 2 Ohms stereo or 4 Ohms 
bridged.

Speaker outputs

This amplifier is a multi channel amplifier design. Meaning it has more than one channel of speaker 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 in place. If the wires ever come in 
contact with each other the amplifier will go into protection.
 

Know your total ohm load before you make any connec-
tions.

5

/

16“

8MM

Strip Speaker Wire

Bass Boost

This amp has an adjustable bass boost. The frequency is fixed at 45Hz. The level of the boost can be adjusted up 
to 12dB. Start with a small increase in the level control. then “sweep” the frequency up and down. Listen carefully 
for an improvement in the sound of the bass. If you do 
not hear any improvement then the woofer does not 
need any boost.

WARNING:

 Use Bass Boost carefully. The demands on 

power output are tremendous. Try to minimize the use 
by changing woofer position or the enclosure size.

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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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