Kenwood X302-4 Instruction Manual

Safety precautionsWARNINGTo prevent injury or fire, take the following precau-tions:• Mounting and wiring this product requires skills andexperience. For safety’s sake, leave the mounting andwiring work to professionals.• When extending the ignition, battery, or ground wires,make sure to use automotive-grade wires or otherwires with the range of 5 mm2 (AWG 10) or more toprevent wire deterioration and damage to the wirecoating.• To prevent a short circuit, never put or leave any metal-lic objects (such as coins or metal tools) inside the unit.• If the unit starts to emit smoke or strange smells,turn off the power immediately and consult yourKENWOOD dealer.• Do not touch the unit during use because the sur-face of the unit becomes hot and may cause burns iftouched.CAUTIONTo prevent damage to the machine, take the follow-ing precautions:• Be sure the unit is connected to a 12 V DC power sup-ply with a negative ground connection.• Do not open the top or bottom covers of the unit.• Do not install the unit in a spot exposed to directsunlight or excessive heat or humidity. Also avoidplaces with too much dust or the possibility of watersplashing.• When replacing a fuse, only use a new one with theprescribed rating. Using a fuse with the wrong ratingmay cause your unit to malfunction.• To prevent a short circuit when replacing a fuse, firstdisconnect the wiring harness.NOTE• If you experience problems during installation, consultyour KENWOOD dealer.• If the unit does not seem to be working right, consultyour KENWOOD dealer.Cleaning the unitIf the front panel gets dirty, turn off the power and wipethe panel with a dry silicon cloth or soft cloth.CAUTIONDo not wipe the panel with a hard cloth or a cloth damp-ened by volatile solvents such as paint thinner and alco-hol. They can scratch the surface of the panel and / orcause the indicator letters to peel off.To prevent battery riseWhen the unit is used in the ACC ON position withoutturning the engine ON, it depletes the battery. Use it afterstarting the engine.Protection functionThe protection function is activated in the followingsituations:This unit is equipped with a protection function forprotecting this unit and your speakers from various acci-dents or problems that can occur.When the protection function is triggered, the powerindicator goes off and the amplifier stops operating.• When a speaker wire may be short-circuited.• When a speaker output contacts ground.• When the unit malfunctions and a DC signal is sent tothe speaker output.• When the internal temperature is high and unit won’toperate.Wiring• Take the battery wire for this unit directly from the bat-tery. If it’s connected to the vehicle’s wiring harness, itcan cause blown fuses etc.• If a buzzing noise is heard from the speakers when theengine is running, connect a line noise filter (optional)to each of the battery wire.• Do not allow the wire to directly contact the edge ofthe iron plate by using Grommets.• Connect the ground wire to a metal part of the carchassis that acts as an electrical ground passing elec-tricity to the battery‘s negative terminal. Do not turnthe power on if the ground wire is not connected.• Be sure to install a protective fuse in the power cordnear the battery. The protective fuse should be thesame capacity as the unit’s fuse capacity or somewhatlarger.• For the power cord and ground, use a vehicle type(fireproof ) power wring cord. (Use a power wiring cordwith the range of 5 mm2 (AWG 10) or more.)• When more than one power amplifier are going to beused, use a power supply wiring wire and protectivefuse of greater current-handling capacity than the totalmaximum current drawn by each amplifier.Speaker selection• Using speakers with smaller input ratings than theamplifier’s output power would result in smoke gener-ation or equipment failure.• The impedance of the speakers that are going to beconnected should be 2 Ω or greater (for stereo con-nections), or 4 Ω or greater (for bridged connections).When more than one set of speakers are going to beused, calculate the combined impedance of the speak-ers and then connect suitable speakers to the amplifier.Combinedimpedance