Kenwood KAC-749S Instruction Manual - Page 2

40 40 40 40 Controls FUSE(40A) POWER IN BATT. GND SPEAKER P.CON OUTPUT BRIDGED LEFT RIGHT A B POWER AMPLIFIER BASS BOOST(B.CH) OFF ON A.CH OFF HPF LPF FILTER B.CH OFF HPF LPF OPERATION A.CH B.CH INPUT SELECTOR STEREO MONO(Lch) STEREO MONO(Lch) A B A 1 2 0.5 3 1 2 0.5 3 80 100 150 100 80 80 100 150 100 80 GND L 4 0.3 4 0.3 150 150 (MIN)5 0.2(MAX) (MIN)5 0.2(MAX) 50 LPF 200 50 HPF 200 50 LPF 200 50 HPF 200 R A.CH B.CH INPUT SENSITIVITY(V) A.CH B.CH FILTER FREQUENCY(Hz) LINE IN A B LINE OUT A +B SPEAKER LEVEL INPUT A B L R 1 2 34 5 BASS BOOST(B.CH) A.CH FILTER B.CH OFF ON OFF HPF LPF OFF HPF LPF 6 OPERATION A.CH B.CH INPUT SELECTOR STEREO MONO(Lch) STEREO MONO(Lch) A B A 7 8 90! 6 1 2 3 4 40 0.5 25 15 10 0.3 (W) (MIN)5 0.2(MAX) INPUT SENSITIVITY(V) 4/3/2 CHANNEL AMPLIFIER KAC-849 MAXIMUM POWER 4/3/2 CHANNEL AMPLIFIER MAXIMUM POWER KAC-749S @ 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. 1 Fuse 40 A × 1 : KAC-849 30 A × 1 : KAC-749S NOTE If you can't find the specified capacity fuse at your store etc., consult your Kenwood dealer. 2 Battery terminal 3 Ground terminal 4 Power control terminal 5 Amplifier A/B SPEAKER OUTPUT terminals • Stereo Connections: When you wish to use the unit as a stereo amplifier, stereo connections are used. • Bridged Connections: When you wish to use the unit as a high-output monaural amplifier, bridged connections are used. (Make connections to the LEFT channel (+) and the RIGHT channel (-) SPEAKER OUTPUT terminals.) 6 INPUT SENSITIVITY control Set this control according to the pre-output level of the center unit connected with this unit, or to the maximum power output of the genuine-accessory car stereo. The sensitivities of amplifiers A and B can be # $ % adjusted independently regardless of the position of the input selector switch. Use the diagram on the right as a guide. NOTE For the pre-output level or the maximum power output, refer to the "Specifications" in the instruction manual of the center unit. 7 FILTER FREQUENCY control When the FILTER switch is set to the HPF (HighPass Filter) or LPF (Low-Pass Filter) position, the threshold frequency can be adjusted with this control. 8 RCA cable ground lead terminal When using an RCA cable with a ground lead attached, connect the ground lead to this terminal. 2CAUTION Do not use this terminal for power source grounding. This unit will be damaged if the power source grounding wire is connected to this terminal. 9 Amplifier A/B LINE IN terminals 0 LINE OUT terminal These jacks output respectively the signals input to amplifiers A and B. They always output the stereo signals regardless of the position of the OPERATION switch. ! Speaker level input terminals @ BASS BOOST switch When the switch is in "ON" position, the bass is boosted by 6 dB. The bass boost applies only to the B amplifier. KAC-849 Power indicator KAC-749S # FILTER switch This switch allows to apply high-pass or low-pass filtering to the speaker outputs. • HPF (High-Pass Filter) position: The filter outputs the band of higher frequencies than the frequency set with the FILTER FREQUENCY control. • OFF position: The entire bandwidth is output without filtering. • LPF (Low-Pass Filter) position: The filter outputs the band of lower frequencies than the frequency set with the FILTER FREQUENCY control. The speaker output is automatically turned monaural (L+R). $ OPERATION switch The amplification methods of the signals input to amplifiers A and B can be selected independently according to the setting of this switch. • STEREO position: The amplifier can be used as a stereo amplifier. • MONO (Lch) position: Amplifies the signal input from the left side only. Set to this position and make bridged connections to use as a high-power monaural amplifier. (The input right signal is not output.) % 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: Amplifies only signal input amplifier A with both amplifiers A and B. Power indicator When the power is turned on, the Power indicator lights. If the Power indicator does not light when the power is turned on, the protection function may be activated. Check whether there is any indication of trouble. ■ The protection function is activated in the following situations: This unit is equipped with a protection function for protecting this unit and your speakers from various accidents or problems that can occur. When the protection function is triggered, the Power indicator 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 to the speaker output. • When the internal temperature is high and unit won't operate. • When a ground wire of the center unit (cassette receiver, CD receiver, etc.) or this unit is not connected to a metal part serving as an electrical ground passing electricity to the battery's negative - terminal. System examples Connection ■ 4-channel FL CENTER RA UNIT R LB R $ % OPERATION INPUT SELECTOR A.CH B.CH STEREO MONO(Lch) STEREO MONO(Lch) A B A ■ 2-channel CENTER UNIT L RA LB R $ % OPERATION INPUT SELECTOR A.CH B.CH STEREO MONO(Lch) STEREO MONO(Lch) A B A ■ 2ch + woofer CENTER UNIT L RA LB R $ % OPERATION INPUT SELECTOR A.CH B.CH STEREO MONO(Lch) STEREO MONO(Lch) A B A ■ 4-channel L Front left speaker A R Front right speaker L Rear left speaker B R Rear right speaker # A.CH FILTER B.CH OFF OFF HPF LPF HPF LPF BASS BOOST(B.CH) @ OFF ON 80 100 150 100 80 80 100 150 100 80 150 150 7 50 LPF 200 50 HPF 200 A.CH 50 LPF 200 50 HPF 200 B.CH FILTER FREQUENCY(Hz) ■ 3-channel L A Left speaker R Right speaker L B Subwoofer R # A.CH FILTER B.CH OFF OFF HPF LPF HPF LPF BASS BOOST(B.CH) @ OFF ON 80 100 150 100 80 80 100 150 100 80 150 150 50 LPF 200 50 LPF 200 7 50 HPF 200 A.CH 50 HPF 200 B.CH FILTER FREQUENCY(Hz) NOTE For safe installation, read "Installation procedure" before starting work. ■ RCA cable connection CENTER UNIT (Cassette receiver, CD receiver, etc.) RCA cable* 8 GND AL R BASS BOOST(B.CH) OFF ON A.CH OFF HPF LPF FILTER B.CH OFF HPF LPF OPERATION A.CH B.CH INPUT SELECTOR STEREO MONO(Lch) STEREO MONO(Lch) A B A 1 2 0.5 3 1 2 0.5 3 80 100 150 100 80 80 100 150 100 80 GND L 4 0.3 4 0.3 150 150 (MIN)5 0.2(MAX) (MIN)5 0.2(MAX) 50 LPF 200 50 HPF 200 50 LPF 200 50 HPF 200 R A.CH B.CH INPUT SENSITIVITY(V) A.CH B.CH FILTER FREQUENCY(Hz) LINE IN A B LINE OUT A +B SPEAKER LEVEL INPUT A B L R L RB ■ Speaker level input connection Cable Color of the connector L A R L B R White White/Black Gray Gray/Black Green Green/Black Purple Purple/Black LR A LR B Genuine-accessory car stereo (No line output center unit etc.) BASS BOOST(B.CH) OFF ON A.CH OFF HPF LPF FILTER B.CH OFF HPF LPF OPERATION A.CH B.CH INPUT SELECTOR STEREO MONO(Lch) STEREO MONO(Lch) A B A 1 2 0.5 3 1 2 0.5 3 80 100 150 100 80 80 100 150 100 80 GND L 4 0.3 4 0.3 150 150 (MIN)5 0.2(MAX) (MIN)5 0.2(MAX) 50 LPF 200 50 HPF 200 50 LPF 200 50 HPF 200 R A.CH B.CH INPUT SENSITIVITY(V) A.CH B.CH FILTER FREQUENCY(Hz) LINE IN A B LINE OUT A +B SPEAKER LEVEL INPUT A B L R Power control wire* ACC Battery Car fuse box ■ Speaker stereo connection AL AR ■ Speaker bridge connection A Bridge ■ 2-channel CENTER UNIT L RA LB R $ % OPERATION INPUT SELECTOR A.CH B.CH STEREO MONO(Lch) STEREO MONO(Lch) A B A ■ Tri-mode ■ 2-channel L A Left speaker R L B Right speaker R # A.CH FILTER B.CH OFF OFF HPF LPF HPF LPF BASS BOOST(B.CH) @ OFF ON 80 100 150 100 80 80 100 150 100 80 150 150 50 LPF 200 50 LPF 200 7 50 HPF 200 A.CH 50 HPF 200 B.CH FILTER FREQUENCY(Hz) Lead terminal* 5 BRIDGED LEFT RIGHT BRIDGED A B L R CENTER UNIT L L A R R L L B R R CL C CL C High pass Subwoofer (L + R) 0 dB -3 dB Crossover Frequency L C Frequency $ % OPERATION INPUT SELECTOR A.CH B.CH STEREO MONO(Lch) STEREO MONO(Lch) A B A # A.CH FILTER B.CH OFF OFF HPF LPF HPF LPF BASS BOOST(B.CH) @ OFF ON C= 159000 fc x R (µF) = 159000 120Hz x 4Ω = 331.25 µF L= 159 x R fc (mH) = 159 x 4Ω 120Hz = 5.3 mH Principle of Tri-mode Method of frequency band division using a coil and capacitor ... in case of 6dB/oct. slope Coil (L): Passes low frequencies and blocks high frequencies. (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies. (High pass) Example: When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms. fc=Cut of Frequency (Hz) R=Speaker Impedance (Ω) 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. • Ensure that the withstand voltage and current ratings of the capacitors (C) and coils (L) are sufficient. 4 FUSE(40A) POWER IN BATT. GND SPEAKER P.CON OUTPUT BRIDGED LEFT RIGHT A B POWER AMPLIFIER BL BR Lead terminal* 5 BRIDGED LEFT RIGHT 4 BRIDGED A B L R FUSE(40A) POWER IN BATT. GND SPEAKER P.CON OUTPUT BRIDGED LEFT RIGHT A B POWER AMPLIFIER B Bridge ■ Power wire connection FUSE(40A) POWER IN BATT. GND SPEAKER P.CON OUTPUT BRIDGED LEFT RIGHT A B POWER AMPLIFIER 2 34 Lead terminal* Terminal cover Battery wire* Power control wire* Ground wire* Description of markings in the figure. A AL AR B BL BR F R * Left Front left Front right Right Rear left Rear right Front Rear Commercially available parts Protective Fuse* Battery