Assessments - 3, GPA: 3.7
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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. • A speaker wire may be short-circuited. • A speaker output may be in contact with the ground. •When the internal temperature is high and unit won’t operate. • The sigma servo connection may be erroneous. • The fuse of this unit may be blown. • The unit may be malfunctioning and sending DC signal to the speaker output. • The grounding wire of this unit may not be connected with a metallic part which is electrically connected with the negative terminal of the battery. • The power control wire may not be connected to this unit. • The grounding wire of the centre unit (cassette receiver, CD receiver, etc.) may not be connected with a metallic part which is electrically connected with the negative terminal of the battery. 2CAUTION NOTE 2CAUTION 2CAUTION 0 SUBWOOFER AMPLIFIER KAC-819 25Hz 15Hz OFF INFRASONIC GND INPUT SENSITIVITY(V) LPF FREQUENCY(Hz) L R LINE IN LEFT RIGHT 12dB SPEAKER LEVEL INPUT 6dB OFF BASS BOOST 0.3 0.5 1 2 3 4 5 0.2 150 120 170 100 70 50 200 SUBWOOFER AMPLIFIER FUSE (30A) POWER IN BATT GND P.CON(REMOTE) SPEAKER OUTPUT 30 . SERVO II . SERVO II MAXIMUM POWER 25Hz 15Hz OFF INFRASONIC INPUT SENSITIVITY(V) LPF FREQUENCY(Hz) 12dB 6dB OFF BASS BOOST 0.3 0.5 1 2 3 4 5 0.2 150 120 170 100 70 50 200 0.3 0.2 0.5 1 2 3 45 (V) (W) 15 10 1 2 3 4 5 6 ! @ # 7 8 9 0 Power indicator Terminal cover Battery Battery wire* Ground wire* Protective Fuse* Connection NOTE For safe installation, read "Installation procedure" before starting work. CENTER UNIT (Cassette receiver, CD receiver, etc.) Power control wire* RCA cable* Genuine-accessory car stereo (No line output center unit etc.) ACC Car fuse box Battery Lead terminal* Subwoofer Lead terminal* Speaker ¦ RCA cable connection ¦ Speaker level input connection *…Commercially available parts 25W or greater Sigma servo feed back The sound reproduced through conventional amplifiers is distorted due to the counterelectromotive force produced in the oscillating system of the speaker. The counterelectromotive force is particularly high with the woofer which requires a large drive mass.The sigma servo connection reduces distortion caused by the counterelectromotive force by including the circuit up to the speaker terminals in the negative feedback loop. This makes it possible to drive speakers with more fidelity to the input signals and create a sharp bass sound image with few feeling of noise interference. The speaker wires and sigma servo wires should be distributed along the same paths. • The extension of the negative feedback loop to include the speaker terminals makes it necessary to connect the sigma servo terminals correctly. Incorrect connection may result in sound degradation or other malfunction. If sound is not reproduced normally, check the connection of the sigma servo terminals, etc. • If the Sigma servo terminals are not connected, the sound may fluctuate or noise may occur. Be sure to connect the Sigma servo terminals correctly. • When connecting speakers in a parallel configuration, use speakers with an impedance of 4 ohms or more. Connecting speakers with smaller impedance than 4 ohms will cause malfunction. • The rated input of the speakers connected to this unit should be no less than the maximum output of the amplifier. Otherwise malfunction may result. Be specially careful in this when connecting speakers in a parallel configuration. 2CAUTION NOTE Distribute the speaker wires and sigma servo wires along the same paths. ¦ Basic sigma servo connection ¦ Series connection Make this wire as short as possible. 2CAUTION ¦ Parallel connection (1) The speaker wires connected to this unit should be thick enough to supply the current capacity of two speakers. 2CAUTION This connection is possible only when the speakers are identical and the speaker wires are also of the same type and length. 2CAUTION ¦ Simplified sigma servo connection ¦ Parallel connection (2) In case any of the connection examples above cannot be used or if the speakers cannot be connected to the speaker terminals, connect them to this unit as shown in the figure. ¦ Speaker level input terminals (#) When the genuine-accessory car stereo power is turned ON/OFF, check that the power to this unit has followed suit. In some cases, the power control is not correctly operated by the genuine-accessory car stereo. If this is the case, connect the ACC or power control signal to the P.CON(REMOTE) terminal. • 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...