Kenwood KAC-528 Stereo Amplifier User Manual
Contents
1. 45 5545 4244525 440 3 150W x2 Frequency Response 0 1 dB 5 Hz 50 kHz Signal to Noise 100 dB Sensitivity MAX rated output pe Sensitivity MIN rated output Input Low Pass Filter 12 dB oct 5 High Pass Filter 12 dB oct General KAC 728 Operating Voltage 11 16 V allowable 14 4V Current Consumption 1 kHz 10 THD 28 A Dimensions W H x 12 628 100 W x 2 300 W x 1 50W x2 150 1 75VVX2 10 Hz 45 kHz 100 dB 0 15 V 4 0V 10 kQ 80 Hz 150 Hz KAC 628 14 4V 19A 220 x 56 1 x 300220 56 1 x 228 2 7 kg KAC 528 7OW x2 200 W x 1 35 W x2 100 W x 1 5OW x2 5 Hz 50 kHz 100 dB 0 2 V 5 0 V 10 KQ 80 Hz KAC 528 14 4 V 16 220 55 160 1 82. Power terminal Connect to their respective terminals the power control cable power supply cable and ground cable all of which pass through the associated terminal cover Once the connections are complete place the cover on the terminal section Wiring f a buzzing noise is heard from the speakers when the engine is running connect a line noise filter optional to each of the battery cable e Do not allow the cord to directly contact the edge of the iron plate by using Grommets Connect the ground cable to a metal part of the car chassis that acts as an electrical ground passing electricity to the battery s negative terminal Do not turn the power if the ground cable is not connected e Be sure to attach a protective fuse into the battery cable close to the battery Use a protective fuse having a capacity that is about 10 A higher than the maximum current drawn by the amplifier e Use vehicle type fire resistant power supply wiring cable for the battery cable and the ground cable The current capacity of the power supply wiring cable should be about 10 A higher than that of the protective fuse capacity which means about 20 A higher than the maximum current drawn by the amplifier e When more than one power amplifier are going to be used use a power supply wiring cable and protective fuse of greater current handling capacity than the total maximum current drawn by each amplifier Example One Power Amplifi
3. are less than the output power of the amplifier will cause smoke to be emitted as well as damage The impedance of the speakers that are going to be connected should be 2Q or greater for stereo connections or 4Q or greater for bridged connections When more than one set of speakers are going to be used calculate the combined impedance of the speakers and then connect suitable speakers to the amplifier Examples Stereo Connections 4Q Bridged Connections 4Q KAC 728 200 W or greater 600 W or greater KAC 628 100 W or greater 300 W or greater KAC 528 70 W or greater 200 W or greater Maximum output of Combined 5 the amplifier impedance Rated input power and impedance of the speakers Connection 8 Power cable connection AWARNING To prevent fire caused by a short in the wiring connect a fusible link or breaker nearby the battery s positive terminal POWER IN Sarr SPEAKER OUTPUT KENWOOD POWER AMPLIFIER Qaes Round terminal Small Round terminal Medium eeeee erminal cover Power terminal CENTER UNIT veer Car fuse box Power control cable Commercially available parts ACC Battery cable Ground cable Commercially available parts Commercially available parts wae Round terminal Large Protective Fuse Battery
4. check that there is nothing hazardous on the opposite side such as a gasoline tank brake pipe or wiring harness and be careful not to cause scratches or other damage e Do not install near the dashboard rear tray or air bag safety parts The installation to the vehicle should securely fasten the unit to a place in which it will obstruct driving If the unit comes off due to a shock and hits a person or safety part it may cause injury or an accident e After installing the unit check to make sure that electrical equipment such as the brake lamps turn signal lamps and windshield wipers operate normally Systemm examples Full range 2 channel system 626728529 OP STEREO CENTER UNIT BS ss FILTER OPERATION OFF LPF STEREO MONO Leh Switch setting Cm 8 LI Left speaker LI Right speaker D 8 High power full range 2 channel system KAC 728 528 FILTER OPERATION OFF LPF STEREO MONO Lch KAC 628 FILTER OPERATION L R HPF LPF STEREO MONO Lch L 728 528 FILTER OPERATION OFF LPF STEREO MONO Lch FILTER OPERATION MPF I STEREG L R Tri mode KAC 728 528 Subwoofer FILTER OPERATION OFF LPF STEREO MONO Lch L R Bridged FILTER OPERATION OFF L R LPF STEREO
5. KENWOOD KAC 728 KAC 628 KAC 528 POWER AMPLIFIER KENWOOD CORPORATION Safety precautions AWARNING To prevent injury and or fire take the following precautions e When extending the battery or ground cables make sure to use automotive grade cables or other cables with an area of 5 mm AWG10 or more to prevent cable deterioration and damage to the cable coating e To prevent short circuits never put or leave any metallic objects e g coins or metal tools inside the unit e f the unit starts to emit smoke or strange smells turn off the power immediately and consult your Kenwood dealer e Do not touch the unit during use because the surface of the unit becomes hot and may cause burns if touched ACAUTION To prevent damage to the machine take the following precautions e Be sure the unit is connected to a 12V DC power supply with a negative ground connection e Do not open the top or bottom covers of the unit e Do not install the unit in a spot exposed to direct sunlight or excessive heat or humidity Also avoid places with too much dust or the possibility of water splashing e When replacing a fuse only use a new one with the prescribed rating Using a fuse with the wrong rating may cause your unit to malfunction e To prevent short circuits when replacing a fuse first disconnect the wiring harness NOTE f you experience problems during installation consult your Ken
6. MONO Lch Switch setting Principle of Tri mode Method of frequency band division using a coil and capacitoreeein case of 6dB oct slope Coil L Passes low frequencies and blocks high frequencies Low pass Capacitor C Passes high frequencies and blocks low gt frequencies High pass C C 159000 uF fexR fc Cut of Frequency Hz 159x R R Speaker Impedance Q fc me a Frequency Example 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 uF and the coil rating should be as close as possible to 5 3 mH ACAUTION e f 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 e 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 e Ensure that the withstand voltage and current ratings of the capacitors C and coils L are sufficient 10 Troubleshooting Guide What might appear to be a malfunction in your unit may just be the result of slight misoperation or miswiring Before calling service first check the fo
7. enter unit and speakers connected with this unit KAC 728 KAC 628 KAC 528 ene FUSE 20A x 2 BATT P CON REMOTE KAC 728 1 KENWOOD KA C 628 E TET S BrT See OUTPUT KENWOOD 528 fe 1 MI CI L D000 4 RCA cable ground lead terminal FILTER switch These switches allow filtering of the speaker output signals KAC 728 528 FILTER OFF LPF KAC 628 FILTER OFF LPF m m e HPF High Pass Filter position KAC 628 only Only frequencies of 150 Hz or higher are output Frequencies below 150 Hz are cut e 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 e OFF position The original sound without filtering is output OPERATION switch This switch allows selection of the amplification method of input signals KAC 728 528 KAC 628 OPERATION OPERATION L R STEREO MONO Lch STEREO MONO Lch STEREO MONO Lch oo e STEREO position The amplifier can be used as a stereo amplifier L R position KAC 628 only The input left and right signals are combined before being am
8. er Is Used Maximum Current Protective Fuse Cross sectional Area of Wiring Drawn Cable AWG KAC 728 28 A 50Ax 1 25 Ax 2 5 mm AWG 10 or greater x 1 KAC 628 19A 30 1 3 mm AWG 12 or greater x 1 KAC 528 16A 25Ax1 3 mm AWG 12 or greater x 1 A 24 Installation Self tapping screw 04 16 mm Installation board etc LZ thickness 15 mm or more e 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 can be considered e Use the extension cables Optional RCA cable CA 12SL CA 22SL CA 52SL RCA cable 27mm CA 13WL CA 23WL CA 53WL RCA cable 12mm CA 15W CA 25W ACAUTION e Do not install the unit under the carpet Otherwise heat build up occurs and the unit may be damaged e Install this unit in a location which allows heat to easily dissipate Once installed do not place any object on top of the unit e The surface temperature of the amplifier will become hot during use Install the amplifier in a place where people resins and other substances that are sensitive to heat will not come into contact with it e When making a hole under a seat inside the trunk or somewhere else in the vehicle
9. llowing table for possible problems PROBLEM No sound POSSIBLE CAUSE e Input or output cables are SOLUTION e Connect the input or output No sound from one side The output level is too small or too large The sound quality is bad The sound is distorted disconnected e Protection circuit may be activated e The fuse may be blown because the volume was too high The input sensitivity adjusting control is not set to the correct position e The speakers cable are connected with wrong polarity e A speaker cable is pinched by a screw in the car body The switches may be set improperly cables e Check connections by referring to Protection function e Replace the fuse with a new fuse and use a lower volume Adjust the control correctly referring to Controls e Connect them properly checking the of the terminals and cables well e Connect the speaker cable again so that it is not pinched by anything e Set switches properly by referring to System examples 11 Specifications Specifications subject to change without notice Audio Section KAC 728 Max Power Output 4 Q NOW 200 VVX 2 600 VV X 1 Rated Power Output 4 Normal 01345324 8 14 4 V 100W x2 Bridge 1 kHz 0 8 THD 300 W x 1 Rated Power Output 2 Q Normal 1 KAZ 0 87 TAD
10. multaneously for this may cause malfunction or damage Left input Right input Lead terminal Commercially available parts Y To Power control REMOTE terminal 2 8 Left output S FE Oni me 1 Right output i C Battery ACAUTION e The genuine accessory car stereo shall have a maximum power output of no more than 25 W e Do not connect the speaker output leads from a power amplifier Optional to the speaker input terminals of this unit for this may cause malfunction or damage e Connect the power control lead to a power supply which can be turned ON OFF by the ignition key switch ACC line With this connection shock noise may be generated when the power of the genuine accessory 6 stereo is switched ON OFF Speakers cable connection Stereo Connections Left output Right output is EF 0000 Lead terminal 52 52 Commercially available parts 11 LL Right C Speaker Lett 6 speaker Bridged Connections KENWOOD POWER AMPLIFIER Lead terminal LA Commercially available parts 0 Speaker Selection The rated input power of the speakers that are going to be connected should be greater than the maximum output power in Watts of the amplifier Use of speakers having input power ratings that
11. nected should have an impedance of 4Q or greater When multiple speakers are to be connected ensure that the combined impedance is 4Q or greater ACAUTION The rated input of the speakers should be no less than the maximum output of the amplifier Otherwise malfunction may result Connection cable connection ACAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals simultaneously for this may cause malfunction or damage RCA cable ground terminal Left input Right input To Power control REMOTE terminal lt RCA cable 1 I Commerciall CENTER UNIT Left output White y d n available part Cassette receiver gt CD receiver 6LC aE gt lt Right output Red RCA cable ground terminal When using an RCA cable with a ground lead at terminal ACAUTION 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 ached connect the ground lead to this 8 Speaker level input connection Connect the unit by inserting it in the connection between the genuine accessory car stereo and speakers ACAUTION Do not connect cables and leads to both RCA cable input jacks and the speaker input terminals si
12. plified Use this position when the unit is used for subwoofer speakers or the L R monaural sound is required e 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 SENSITIVITY control Set this control according to the pre output evel of the center unit connected with this unit or to the maximum power output of the genuine accessory car stereo Use the diagram on the 10 right as a guide For the pre output level or the maximum power output refer to the Specifications in the instruction manual of the center unit LINE IN terminal Speaker level input terminals Fuse 20 A x 2 KAC 728 25 Ax 1 KAC 628 15 Ax 1 KAC 528 Battery terminal Ground terminal Power control REMOTE terminal 0 SPEAKER OUTPUT terminals e Stereo Connections When you wish to use the unit as a stereo amplifier stereo connections are used The speakers to be connected should have an impedance of 20 or greater When multiple speakers are to be connected ensure that the combined impedance is 2Q or greater for each channel 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 The speakers to be con
13. the temperature of internal parts exceeds 120 C 248 F e When a ground cable 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 Installation procedure 1 Remove the ignition key and disconnect the negative terminal of the battery to prevent short circuits 2 Set the unit according to the intended usage 3 Connect the input and output cables of the units 4 Connect the speaker cables 5 Connect the power cable power control cable and grounding cable following this order 6 Install the unit in the car 7 Connect the negative terminal of the battery ACAUTION e Be sure to turn the power off before changing the setting of any switch e f the fuse blows check cables for shorts then replace the fuse with one of the same rating e Check that no unconnected cables or connectors are touching the car body Do not remove caps from unconnected cables or connectors to prevent short circuits e 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 e After installation check that the brake lamps winkers and wipers work properly Controls Operations of the following control and switches are required in accordance with the c
14. wood dealer e f the unit does not seem to be working right consult your Kenwood dealer Cleaning the unit If the front panel gets dirty turn off the power and wipe the panel with a dry silicon cloth or soft cloth ACAUTION Do not wipe the panel with a hard cloth or a cloth dampened by volatile solvents such as paint thinner and alcohol They can scratch the surface of the panel and or cause the indicator etters to peel off Accessories Number of Items External View Round termina Large Round termina Medium Round termina Small Terminal cover Power terminal Self tapping screws 04 x 16 mm 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 8 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 Power indicator protection function may be activated Check whether there is any 5 indication of trouble 8 The protection function activates in the following situations KENWOOD e When a speaker cable may be short circuited e When a speaker output contacts ground e When the unit malfunctions and a DC signal is sent to the speaker output e When
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