Kenwood KAC-6401 Instruction Manual - Page 2

25 25 25 25 Controls 1 2 34 5 6 7 890 6 1 2 3 4 40 0.5 30 20 10 0.3 (W) (MIN)5 0.2(MAX) INPUT SENSITIVITY(V) Power indicator 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 (25 A) 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 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. 8 Amplifier A/B LINE IN terminals 9 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. 0 Speaker level input terminals ! 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.) @ FILTER switch These switches allow filtering of the speaker output signals. • HPF (High Pass Filter) position Only frequencies of 150 Hz or higher are output. (Frequencies below 150 Hz are cut.) • LPF (Low Pass Filter) position Only frequencies of 80 Hz or lower are output. (Frequencies above 80 Hz are cut.) The Lch and Rch will be mixed before output even if the operation switch is set to STEREO. • OFF position The original sound without filtering is 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 ■ 4-channel FL CENTER RA UNIT R LB R A.CH OPERATION B.CH OPERATION INPUT SELECTOR STEREO MONO (Lch) STEREO MONO (Lch) AB A ! # ■ 2-channel CENTER UNIT L RA LB R A.CH OPERATION B.CH OPERATION INPUT SELECTOR STEREO MONO (Lch) STEREO MONO (Lch) AB A ! # ■ 2ch + woofer CENTER UNIT L RA LB R A.CH OPERATION B.CH OPERATION INPUT SELECTOR STEREO MONO (Lch) STEREO MONO (Lch) AB A ! # ■ 2-channel CENTER UNIT L RA LB R A.CH OPERATION B.CH OPERATION INPUT SELECTOR STEREO MONO (Lch) STEREO MONO (Lch) AB 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 FILTER OFF HPF LPF OFF HPF LPF @ ■ 3-channel L A Left speaker R Right speaker L B Subwoofer R A.CH FILTER B.CH FILTER OFF HPF LPF OFF HPF LPF @ ■ 2-channel L A Left speaker R L B Right speaker R A.CH FILTER B.CH FILTER OFF HPF LPF OFF HPF LPF @ Connection NOTE For safe installation, read "Installation procedure" before starting work. ■ RCA cable connection CENTER UNIT (Cassette receiver, CD receiver, etc.) 7 GND RCA cable* AL 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.) Power control wire* ■ Speaker stereo connection Lead terminal* 5 BRIDGED LEFT RIGHT AL 4 AR ACC Battery Car fuse box ■ Speaker bridge connection Lead terminal* 5 BRIDGED LEFT RIGHT A Bridge 4 BRIDGED A B L R BRIDGED A B L R ■ Tri-mode 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 A.CH OPERATION B.CH OPERATION STEREO MONO (Lch) STEREO MONO (Lch) ! A.CH FILTER B.CH FILTER OFF HPF LPF OFF HPF LPF @ INPUT SELECTOR AB A # C= 159000 fc x R (µF) = 159000 120Hz x 4Ω = 331.25 µF L= 159 x fc R (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. BL BR ■ Power wire connection GND 2 34 Lead terminal* Terminal cover Battery wire* Power control wire* Ground wire* Protective Fuse* Battery B Bridge Description of markings in the figure. A AL AR B BL BR F R * A-channel A.ch Left A.ch Right B-channel B.ch Left B.ch Right Front Rear Commercially available parts