User manual ACOUSTIC RESEARCH A-03 service manual

[. . . ] · After installation, check that the brake lamps, winkers, and wipers work properly. Installation Self-tapping screw (ø4 × 16 mm) Installation board, etc. (thickness : 15 mm or more) · Since the power amplifier has no parts which require operation, it can be installed at a position away from the driver's seat without any hindrances. As generally accepted positions for its installation, places such as inside the trunk, etc. (Optional. ) Length 0. 5m 1m 2m 4m 5m 6m Type RCA cable CA-2SL CA-12SL CA-22SL CA-52SL RCA cable (ø7mm) CA-3WL CA-13WL CA-23WL CA-53WL RCA cable (ø12mm) CA-5W CA-15W CA-25W CA-45W CA-65W 2CAUTION · Do not install the unit under the carpet. [. . . ] · Install this unit in a location which allows heat to easily dissipate. · After installing the unit, check to make sure that electrical equipment such as the brake lamps, turn signal lamps and windshield wipers operate normally. · Install the unit securely in a location that does not interfere with driving. 3 Controls Operations of the following control and switches are required in accordance with the center unit and speakers connected with this unit. FILTER OFF LPF OPERATION STEREO MONO(Lch) 0. 5 1. 0 0. 3 SPEAKER LEVEL INPUT LEFT RIGHT LINE IN L R GND MIN MAX INPUT SENSITIVITY(V) A-03 KAC-526X 1 2 34 POWER IN 5 6 GND FUSE(20A x 2) BATT P. CON(REMOTE) BRIDGED LEFT RIGHT SPEAKER OUTPUT POWER AMPLIFIER A-03 7 89 0 POWER IN ! BRIDGED FUSE(15A) BATT GND P. CON(REMOTE) LEFT RIGHT SPEAKER OUTPUT POWER AMPLIFIER KAC-526X 7 89 0 ! 1 RCA cable ground lead terminal 2 FILTER switch These switches allow filtering of the speaker output signals. · 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. 3 OPERATION switch This switch allows selection of the amplification method of input signals. · 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. ) 4 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 genuineaccessory car stereo. Use the diagram on the right as a guide. 15 10 0. 5 0. 3 1. 0 MIN (W) MAX 25 4 NOTE For the pre-output level or the maximum power output, refer to the "Specifications" in the instruction manual of the center unit. 5 LINE IN terminal 6 Speaker level input terminals 7 Fuse (20 A × 2 : A-03) Fuse (15 A : KAC-526X) 8 Battery terminal 9 Ground terminal 0 Power control (REMOTE) terminal !SPEAKER OUTPUT terminals Protection function 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. After completing connections, fasten terminal cover over terminal bracket. Round terminal (Medium) Round terminal (Small) (Bridged) 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. examples: L R L POWER IN GND BATT P. CON(REMOTE) BRIDGED LEFT RIGHT SPEAKER OUTPUT 4 R 8 8 Bridged 7 System examples s Full-range 2-channel system Switch setting FILTER OFF LPF OPERATION STEREO MONO(Lch) CENTER UNIT L R L R Left speaker Right speaker s High-power full-range 2-channel system Switch setting FILTER OFF LPF L L R L R L R Left speaker (Bridged) Right speaker (Bridged) OPERATION STEREO MONO(Lch) CENTER UNIT R L R s Full-range 2-channel + Subwoofer system Switch setting FILTER OFF LPF OPERATION STEREO MONO(Lch) CENTER UNIT L R L R Left speaker Right speaker Subwoofer (L + R) (Bridged) s Tri-mode Switch setting FILTER OFF LPF L C L R L R OPERATION STEREO MONO(Lch) CENTER UNIT High pass C Subwoofer (L + R) (Bridged) qPrinciple of Tri-mode Method of frequency band division using a coil and capacitor···in case of 6dB/oct. slope Crossover Frequency 0 dB -3 dB L C Frequency qExample: When it is required to set a crossover frequency of 120 Hz using speakers with an impedance of 4 ohms. Prepare commercially-available coil and capacitor with the closest ratings to the results calculated from the formula above. The capacitor rating should be as close as possible to 331. 25 (µF) and the coil rating should be as close as possible to 5. 3 (mH). 2CAUTION Coil (L): Passes low frequencies and blocks high frequencies. (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies. [. . . ] 2CAUTION Coil (L): Passes low frequencies and blocks high frequencies. (Low pass) Capacitor (C): Passes high frequencies and blocks low frequencies. (High pass) 159000 C= (µF) fc=Cut of Frequency (Hz) fc x R R=Speaker Impedance () 159 x R L= (mH) fc 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. 8 Troubleshooting Guide What might appear to be a malfunction in your unit may just be the result of slight misoperation or miswiring. [. . . ]