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Safety precautions • To prevent short circuits when replacing a 2WARNING fuse, first disconnect the wiring harness. To prevent injury and/or fire, take the NOTE following precautions: • When extending the battery or ground • If you experience problems during cables, make sure to use automotive-grade installation, consult your Kenwood dealer. 2 cables or other cables with an area of 3 mm • If the unit does not seem to be working right, (AWG12) or more to prevent cable consult your Kenwood dealer.
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Installation procedure 1. Remove the ignition key and disconnect the negative - terminal of the battery to prevent short circuits. 2. Set the unit according to the intended usage. 3. Connect the input and output cables of the units. 4. Connect the speaker cables. 5. Connect the power cable, power control cable and grounding cable following this order. 6. Install the unit in the car. 7. Connect the negative - terminal of the battery. 2CAUTION • Be sure to turn the power off before changing the s
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25 Controls This is a 4 channel amplifier including 2 stereo amplifiers in a body. One amplifier is referred to as amplifier A and the other is amplifier B. This unit is compatible with a large variety of systems by combining the switches and functions described in the following. 5 SPEAKER LEVEL INPUT POWER IN SPEAKER OUTPUT BRIDGED FUSE(25A) LEFT RIGHT LEFT RIGHT A A GND SPEAKER LEVEL INPUT BATT P.CON(REMOTE) A B B L R B 1 2 346 7 8 9 0! OPERATION FILTER FILTER OPERATION INPUT SELECTOR LINE IN
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independently according to the setting of ! LINE OUT terminal this switch. These jacks output respectively the signals input to amplifiers A and B. They always • STEREO position: output the stereo signals regardless of the The amplifier can be used as a stereo position of the OPERATION switch. amplifier. • MONO (Lch) position: @ RCA cable ground lead terminal Amplifies the signal input from the left side # INPUT SENSITIVITY control only. Set to this position and make bridged Set this control acc
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System examples n High-pass + Subwoofer system 1.0 L 0.5 L FILTER OPERATION A (High pass) OFF STEREO MONO(Lch) HPF LPF R 0.3 MIN MAX CENTER UNIT R INPUT INPUT SELECTOR CONTROL A SENSITIVITY(V) A B A L CONTROL B 1.0 B R Subwoofer FILTER OPERATION 0.5 OFF (Lch) HPF LPF STEREO MONO 0.3 (L + R) L Switch setting LINE MIN MAX INPUT OUT SENSITIVITY(V) R (Bridged) n High-power 2-channel system 1.0 L L 0.5 Left FILTER OPERATION A OFF STEREO MONO(Lch) HPF LPF R 0.3 CENTER UNIT speaker MIN MAX INPUT INPUT
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25 Connection n Power cable connection 2WARNING To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery’s positive terminal. SPEAKER LEVEL INPUT POWER IN SPEAKER OUTPUT BRIDGED FUSE(25A) LEFT RIGHT LEFT RIGHT A A GND SPEAKER LEVEL INPUT BATT P.CON(REMOTE) A B B L R B Round terminal (Small) Round terminal (Medium) Power terminal Terminal cover Power control cable CENTER UNIT Battery cable Ground cable Round terminal (Large) Protective Fuse Battery
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25 25 Connection n Speakers cable connection (Stereo Connections) Front Left speaker Lead terminal (Commercially available parts) Front Right speaker A Right output A Left output SPEAKER LEVEL INPUT SPEAKER OUTPUT BRIDGED FUSE(25A) POWER IN LEFT RIGHT LEFT RIGHT A A GND SPEAKER LEVEL INPUT BATT P.CON(REMOTE) A B B L R B Speaker terminal polarity BRIDGED B Right output A B Left output B L R Rear Right speaker Rear Left speaker (Bridged Connections) Lead terminal Speaker (Bridged) (Commerciall
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Examples: Model Stereo Connections (4Ω) Bridged Connections (4Ω) KAC-648 50 W or greater 140 W or greater 50W (2Ω) 25W 25W 50W 50W 50W 50W (8Ω) (8Ω) (4Ω) (4Ω) (4Ω) (4Ω) 50W (2Ω) 4 Ω 4 Ω 4 Ω Maximum output of Combined the amplifier Rated input power and impedance impedance of the speakers n RCA cable connection 2CAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, for this may cause malfunction or damage. A Left input B Left input
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25 Connection n Speaker level input connection Connect the unit by inserting it in the connection between the genuine-accessory car stereo and speakers. 2CAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously, for this may cause malfunction or damage. To Power control A Left input A Right input (REMOTE) terminal SPEAKER LEVEL INPUT POWER IN SPEAKER OUTPUT BRIDGED FUSE(25A) LEFT RIGHT LEFT RIGHT A GND A SPEAKER LEVEL INPUT BATT P.CO
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Troubleshooting Guide What might appear to be a malfunction in your unit may just be the result of slight misoperation or miswiring. Before calling service, first check the following table for possible problems. PROBLEM POSSIBLE CAUSE SOLUTION No sound. • Input (or output) cables are • Connect the input (or output) (No sound from one side.) disconnected. cables. • Protection circuit may be • Check connections by referring activated. to "Protection function". • The fuse may be blown because • Rep
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Specifications Specifications subject to change without notice. Audio Section Max Power Output (4 Ω) 4 Channel Mode.................................................................................................................50 W · 4 3 Channel Mode............................................................................................50 W · 2 + 140 W · 1 2 Channel Mode...............................................................................................................140 W · 2 R
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KAC-648
4-CHANNEL POWER AMPLIFIER
INSTRUCTION MANUAL
B64-1364-00 (EM)
