User manual KENWOOD KAC-749S

[. . . ] · Connect the speaker wire again so that it is not pinched by anything. · Set switches properly by referring to "System examples". KAC-849 KAC-749S 4-CHANNEL POWER AMPLIFIER The output level is too small (or too large). (The sound is distorted. ) The input sensitivity adjusting control is not set to the correct position. · The speakers wire are connected with wrong + / polarity. [. . . ] Using a fuse with the wrong rating may cause your unit to malfunction. · To prevent a short circuit when replacing a fuse, first disconnect the wiring harness. NOTE Example: One Power Amplifier Is Used Maximum Current Drawn Protective Fuse Cross-sectional Area of Wiring Wire (AWG) 25 A 25 A 25 A 25 A 31 A / 26 A 50 A ´ 1 [25 A ´ 2] 5 mm2 (AWG 10) or greater ´ 1 · Be sure to turn the power off before changing the setting of any switch. · If the fuse blows, check wires for shorts, then replace the fuse with one of the same rating. · Check that no unconnected cables or connectors are touching the car body. Do not remove caps from unconnected cables or connectors to prevent short circuits. · Connect the speaker wires to appropriate speaker connectors separately. Sharing the negative wire of the speaker or grounding speaker wires to the metal body of the car can cause this unit to fail. · After installation, check that the brake lamps, winkers, and wipers work properly. s Speaker level input terminals (!) · The genuine-accessory car stereo shall have a maximum power output of no more than 40 W. · Do not connect the speaker output leads from a power amplifier (Optional) to the speaker level input terminals of this unit, for this may cause malfunction or damage. · Do not connect cables and leads to both RCA cable input jacks and the speaker level input terminals simultaneously, for this may cause malfunction or damage. · Connect the power control lead to a power supply which can be turned ON/OFF by the ignition key switch (ACC line). With this connection, shock noise may be generated when the power of the genuine-accessory car stereo is switched ON/OFF. · If you experience problems during installation, consult your Kenwood dealer. · If the unit does not seem to be working right, consult your Kenwood dealer. s Speaker Selection · The rated input power of the speakers that are going to be connected should be greater than the maximum output power (in Watts) of the amplifier. Use of speakers having input power ratings that are less than the output power of the amplifier will cause smoke to be emitted as well as damage. · The impedance of the speakers that are going to be connected should be 2½ or greater (for stereo connections), or 4½ or greater (for bridged connections). When more than one set of speakers are going to be used, calculate the combined impedance of the speakers and then connect suitable speakers to the amplifier. 4½ 4½ 4½ 4½ FCC WARNING This equipment may generate or use radio frequency energy. Changes or modifications to this equipment may cause harmful interference unless the modifications are expressly approved in the instruction manual. The user could lose the authority to operate this equipment if an unauthorized change or modification is made. · Do not install the unit under the carpet. Otherwise heat build-up occurs and the unit may be damaged. [. . . ] The bass boost applies only to the B amplifier. % INPUT SELECTOR switch This switch selects the input method of the signals to be amplified by amplifiers A and B. · A B position: Amplifies both of the signals input to amplifiers A and B. · A position: System examples s 4-channel F Connection s 4-channel NOTE For safe installation, read "Installation procedure" before starting work. CENTER UNIT OPERATION A. CH STEREO L R L R A B A B L R L R FILTER R $ INPUT SELECTOR AB A Front left speaker Front right speaker Rear left speaker Rear right speaker # B. CH OFF HPF LPF s RCA cable connection CENTER UNIT (Cassette receiver, CD receiver, etc. ) RCA cable* s Speaker level input connection Cable Color of the connector L A R A L R L R B BASS BOOST(B. CH) OFF ON B. CH MONO(Lch) STEREO MONO(Lch) % A. CH OFF HPF LPF BASS BOOST(B. CH) OFF ON @ B s 2-channel CENTER UNIT OPERATION A. CH STEREO 100 80 80 150 100 150 100 80 80 150 100 150 L R L R L R A B 50 LPF 200 50 LPF 200 50 HPF 200 50 HPF 200 B. CH A. CH FILTER FREQUENCY(Hz) 7 White White/Black Gray Gray/Black Green Green/Black Purple Purple/Black A. CH OFF HPF LPF Genuine-accessory car stereo (No line output center unit etc. ) L A R L B R s 3-channel A B L R L R FILTER 8 Left speaker Right speaker Subwoofer D GN BASS BOOST(B. CH) OFF ON A. CH OFF HPF LPF FILTER B. CH OFF HPF LPF OPERATION A. CH STEREO MONO(Lch) B. CH 80 INPUT SELECTOR A LINE IN A B STEREO MONO(Lch) A B LINE OUT A+B FILTER B. CH OFF HPF LPF OPERATION A. CH STEREO MONO(Lch) B. CH 80 INPUT SELECTOR A LINE IN A B STEREO MONO(Lch) A B LINE OUT A+B 1 2 3 4 0. 5 0. 3 2 3 4 1 0. 5 0. 3 $ INPUT SELECTOR AB A 100 80 80 150 100 150 100 80 150 100 L 1 2 0. 5 0. 3 2 3 4 3 4 1 0. 5 0. 3 B. CH MONO(Lch) STEREO MONO(Lch) % GND 150 100 80 80 150 100 150 100 80 150 100 L GND 150 SPEAKER LEVEL INPUT R A B SPEAKER LEVEL INPUT R A B (MIN)5 0. 2(MAX) (MIN)5 0. 2(MAX) A. CH B. CH INPUT SENSITIVITY(V) 50 LPF 200 50 LPF 200 50 HPF 200 50 HPF 200 B. CH A. CH FILTER FREQUENCY(Hz) L R (MIN)5 0. 2(MAX) (MIN)5 0. 2(MAX) A. CH B. CH INPUT SENSITIVITY(V) 50 LPF 200 50 LPF 200 50 HPF 200 50 HPF 200 B. CH A. CH FILTER FREQUENCY(Hz) L R s 2ch + woofer CENTER UNIT OPERATION A. CH STEREO ACC Power control wire* Battery Car fuse box L R L R A B A. CH OFF HPF LPF # B. CH OFF HPF LPF BASS BOOST(B. CH) OFF ON @ 100 80 80 150 100 150 100 80 80 150 100 150 $ INPUT SELECTOR AB A B. CH MONO(Lch) STEREO MONO(Lch) % 50 LPF 200 50 LPF 200 50 HPF 200 50 HPF 200 B. CH A. CH FILTER FREQUENCY(Hz) s Speaker stereo connection A L A R s Speaker bridge connection A Bridge 7 s 2-channel CENTER UNIT OPERATION A. CH STEREO s 2-channel L R L R Lead terminal* Left speaker Right speaker A B L A R B L R FILTER 5 4 Lead terminal* FT LE ED IDG BR HT RIG 5 GND SPEAKER P. CON OUTPUT BRIDGED LEFT RIGHT A FT LE ED IDG BR HT RIG 4 POWER IN FUSE(40A) BATT. POWER IN FUSE(40A) BATT. GND SPEAKER P. CON OUTPUT BRIDGED LEFT RIGHT A 40 40 $ INPUT SELECTOR AB B. CH MONO(Lch) STEREO MONO(Lch) % A B B A. CH OFF HPF LPF # B. CH OFF HPF LPF BASS BOOST(B. CH) OFF ON POWER AMPLIFIER POWER AMPLIFIER @ BRIDGED BRIDGED 100 80 80 150 100 150 100 80 80 150 100 150 A B L R L R A B 50 LPF 200 50 LPF 200 50 HPF 200 50 HPF 200 B. CH A. CH FILTER FREQUENCY(Hz) 7 s Tri-mode C B L R L R C C L L B R B Bridge Crossover Frequency 0 dB High pass -3 dB L C FUSE(40A) CENTER UNIT A s Power wire connection Description of markings in the figure. POWER IN BATT. L R OPERATION A. CH STEREO B L R C A. CH FILTER L Subwoofer (L + R) BASS BOOST(B. CH) OFF ON GND SPEAKER P. CON OUTPUT BRIDGED LEFT RIGHT A A A POWER AMPLIFIER Frequency L R B L R B A B B $ INPUT SELECTOR AB B. CH MONO(Lch) STEREO MONO(Lch) % A OFF HPF LPF # B. CH OFF HPF LPF @ 159000 159000 C= (µF) = = 331. 25 µF fc x R 120Hz x 4½ 159 x R 159 x 4½ L= (mH) = = 5. 3 mH fc 120Hz 2CAUTION · If you wish to bridge-connect a speaker, the speaker impedance must be no less than 4 ohms. Connecting a speaker with an impedance lower than 4 ohms may damage the unit. · Be sure to connect capacitors to speakers to which high frequencies will be passed. Failure to do so will result in a drop of the combined impedance with the subwoofer. [. . . ]