User manual KENWOOD KAC-PS500F

[. . . ] · Connect the speaker cables to appropriate speaker connectors separately. Sharing the negative cable of the speaker or grounding speaker cables 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. Take the following precautions to prevent fire and avoid personal injury : · When extending the battery cable, or ground cable, use 5mm2 (AWG10) or larger automotive grade cable to avoid cable deterioration or damage to the covering. · Check that no metal objects (coins, tools, etc. ) are left inside the unit to avoid short circuits. [. . . ] In certain situations, the cooling fans may be operating from the beginning of the amplifier operation. 6 Power control (REMOTE) terminal 7 INPUT SENSITIVITY control Adjust this control according to the pre-out level of the center unit connected to this amp. The sensitivities of amplifiers A and B can be adjusted independently regardless of the position of the input selector switch. NOTE Refer to "Specifications" on the center unit's instruction manual about the pre-out level. · OFF position: The entire bandwidth is output without filtering. * Amplifier A SIGMA SERVO I FEED BACK terminals (See p. 7) ( Amplifier B SIGMA SERVO I FEED BACK terminals (See p. 7) 2CAUTION The SIGMA SERVO FEEDBACK terminals should be connected properly. Failure to connect them properly will be the cause of breakdown. · LPF (Low-Pass Filter) position: The filter outputs the band of lower frequencies than the frequency set with the LPF FREQUENCY control. The speaker output is automatically turned monaural (L+R) and the bass boost function is activated. 2 RCA cable ground lead terminal 3 Amplifier A LINE IN terminal 4 Amplifier B LINE IN terminal 5 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. @ FREQUENCY control When the FILTER switch is set to the HPF (High-Pass Filter) or LPF (Low-Pass Filter) position, the threshold frequency can be adjusted with this control. 8 INFRASONIC FILTER FREQUENCY switch When this switch is set to 15 Hz or 25 Hz, frequencies below the setting value will be cut. This serves to get rid of unwanted # Fuse (20 A × 4) $ Battery terminal 4 English English 5 Power indicator s Power indicator: This lamp indicates the status of the unit, including the power supply and protection function, by lighting in red, amber or green or turning off. When power is turned ON, it lights in green for a few seconds, then turns red when normal operation starts. Power indicator 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 aforementioned effects will not be obtained when the sigma servo connection has not been made. NOTE The speaker cable and the sigma servo cable should be wired to run along the same route. Note that this wiring should be separated from the power supply cable. 2CAUTION · The SIGMA SERVO FEEDBACK terminals should be connected properly. · The rated input of the speakers connected to this unit should be no less than the maximum output of the amplifier. Be specially careful in this when connecting speakers in a parallel configuration. · Speakers that are to be used for bridged connections to this unit should have an impedance of 4 or greater. When connecting multiple speakers, ensure that the combined impedance is 4 or greater. Connection of speakers of less than 4 will be the cause of breakdown. s The protection function is activated in the following situations: This unit incorporates a protection function which protects the main unit and speakers from troubles. [. . . ] , Through LPF (30 kHz) Cause · Input (or output) cables are disconnected. The input sensitivity adjusting control is not set to the correct position. · The switches may be set improperly. Remedy · Connect the input (or output) cables. · Check the connection referring to "Sigma servo feedback". [. . . ]