Before you start Setting the unit CAUTION ! Always keep the volume low enough to hear outside sounds. ! Extended use of the stereo while the engine is at rest or idling may exhaust the battery. ! This product is evaluated in moderate and tro- pical climate condition under the Audio, video and similar electronic apparatus - Safety re- quirements, IEC 60065. ! The graphical symbol placed on the product means direct current. ! Connect either of three subwoofers to the am- plifier; 1: a subwoofer with a 300 W or larger nominal input and an impedance 4 W, 2: a subwoofer with a 500 W or larger nominal input and an impedance 2 W, or 3: a subwoofer with a 800 W or larger nominal input and an impedance 1 W. If the nominal input and impedance are out of the above ranges, the subwoofer may catch fire, emit smoke or become damaged. About the protection function This product has protection function. When this product detects something abnormal, the following functions will operate to protect the product and speaker output. ! The POWER/PROTECT indicator will turn red and the amplifier will shut down in the situations outlined below. — If the temperature inside the amplifier gets too high. — If a DC voltage is applied to the speaker output terminal. ! The POWER/PROTECT indicator will turn red and the output will be muted in the situations outlined below. — If the speaker output terminal and speaker wire are short-circuited. What’s what Front side 1 23 4 Rear side To adjust the switch, use a flathead screwdriver if needed. 1 POWER/PROTECT indicator The power indicator lights up to indicate power ON. ! If something is not normal, the indicator turns red. 2 GAIN (gain) control If the output remains low, even when the stereo volume is turned up, turn the controls to a lower level. If distortion occurs when the stereo volume is turned up, turn these controls to a higher level. ! For use with an RCA equipped stereo (standard output of 500 mV), set to the NORMAL position. For use with an RCA equipped Pioneer stereo, with maximum output of 4 V or more, adjust level to match that of the stereo output. ! For use with an RCA equipped stereo with output of 4 V, set to the H position. ! If you hear too much noise when using the speaker input terminals, turn the gain control to higher level. 3 LPF (low-pass filter) cut off frequency control You can select a cut off frequency from 40 Hz to 240 Hz. En Setting the unit 4 SUBSONIC FILTER Switch When turned ON, frequencies of 30 Hz and below are cut. Relationship between amplifier gain and head unit output power Setting gain properly ! Protective function included to prevent malfunction of the unit and/or speakers due to excessive output, improper use or improper connection. ! When outputting high volume sound etc., this function cuts off the output for a few seconds as a normal function, but output is restored when the volume of the head unit is turned down. ! A cut in sound output may indicate improper setting of the gain control. To ensure continuous sound output with the head unit at a high volume, set amplifier gain control to a level appropriate for the preout maximum output level of the head unit, so that volume can remain unchanged and to control excess output. ! Despite correct volume and gain settings, the unit sound still cuts out periodically. In such cases, please contact the nearest authorized Pioneer Service Station. Gain control of this unit Preout level: 2 V (Standard: 500 mV) If amplifier gain is raised improperly, this will simply increase distortion, with little increase in power. Signal waveform when outputting at high volume using amplifier gain control If the signal waveform is distorted due to high output, even if the amplifier gain is raised, the output power will change only slightly. Preout level: 4 V Above illustration shows NORMAL gain setting. En Connecting the units Connection diagram 2 3 5 7 6 4 8 9 a 1 c b f g h 9 Connecting wire with RCA pin plugs (sold separately) a Amplifier with RCA input jacks (sold separately) b RCA input jack c RCA output jack d System remote control wire (sold separately) e Speaker output terminals Please see the following section for speaker connection instructions. Refer to Connections when using the speaker input wire. f Fuse (40 A) × 2 g Front side h Rear side Before connecting the amplifier d e 1 Battery wire (sold separately) ! The maximum length of the wire between the fuse and the positive + terminal of the battery is 30 cm (12 in.). ! For the wire size, refer to Connecting the power terminal. The battery wire, the ground wire and the optional direct ground wire must be same size. After making all other connections at the amplifier, connect the battery wire terminal of the amplifier to the positive + terminal of the battery. 2 Fuse (80 A) (sold separately) Each amplifier must be separately fused at 80 A. 3 Positive + terminal 4 Negative (*) terminal 5 Battery (sold separately) 6 Ground wire, Terminal (sold separately) The ground wires must be same size as the battery wire. 7 Stereo with RCA output jacks (sold separately) 8 External output WARNING ! Secure the wiring with cable clamps or adhe- sive tape. To protect the wiring, wrap sections in contact with metal parts in adhesive tape. ! Never cut the insulation of the power supply to feed power to other equipment. Current capacity of the wire is limited. CAUTION ! To prevent water from entering the amplifier, attach a cover or cap to each terminal when not in use. ! Never shorten any wires, the protection circuit may malfunction. ! Never wire the speaker negative cable directly to ground. ! Never band together multiple speaker’s negative cables. ! If the system remote control wire of the amplifier is connected to the power terminal via the ignition switch (12 V DC), the amplifier will remain on with the ignition whether the stereo is on or off, which may exhaust battery if the engine is at rest or idling. En Connecting the units ! Install and route the separately sold battery wire as far as possible from the speaker wires. Install and route the separately sold battery wire, ground wire, speaker wires and the amplifier as far away as possible from the antenna, antenna cable and tuner. When connecting to two speakers The output from two speakers is the same as that of one speaker. Connecting the speakers This amplifier can be connected to two speakers in parallel. Connect the speaker leads to suit the mode according to the figure shown below. Precautions for parallel connection ! When wiring two speakers in parallel, make sure that the synthetic impedance is from 1 W to 8 W to prevent the amplifier from catching fire, generating smoke and/or being damaged. ! When connected in parallel with the synthetic impedance less than 1 W, as a normal function, this amplifier may automatically be set on mute if outputting high volume sound. Turn down the volume until the mute function is canceled. When connecting to one speaker Speaker output Speaker output En
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