KAC-728 KAC-628 KAC-528 POWER AMPLIFIER INSTRUCTION MANUAL B64-1360-00 (EM)
Safety precautions 2WARNING To prevent injury and/or fire, take the following precautions: • When extending the battery or ground cables, make sure to use automotive-grade cables or other cables with an area of 5 mm 2 (AWG10) or more to prevent cable deterioration and damage to the cable coating. • To prevent short circuits, never put or leave any metallic objects (e.g., coins or metal tools) inside the unit.
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. ■ 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.
Controls Operations of the following control and switches are required in accordance with the center unit and speakers connected with this unit. SPEAKER LEVEL INPUT LEFT RIGHT OPERATION FILTER OFF LPF STEREO KAC-728 MONO(Lch) 0.5 LINE IN R L 0.3 1.0 GND MIN MAX INPUT SENSITIVITY(V) 1 2 3 4 5 6 SPEAKER LEVEL INPUT LEFT RIGHT OPERATION FILTER OFF HPF LPF L+R STEREO MONO(Lch) 0.5 KAC-628 LINE IN R L 0.3 1.
1 RCA cable ground lead terminal 2 FILTER switch These switches allow filtering of the speaker output signals. KAC-628 KAC-728/528 FILTER FILTER OFF LPF OFF HPF LPF • HPF (High Pass Filter) position (KAC-628 only) 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.
Connection ■ RCA cable connection 2CAUTION 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. Right input Left input RCA cable ground terminal FILTER D GN OFF LPF SPEAKER LEVEL INPUT LEFT RIGHT OPERATION STEREO MONO(Lch) 0.5 LINE IN L 0.3 R 1.0 GND MIN MAX INPUT SENSITIVITY(V) To Power control (REMOTE) terminal CENTER UNIT (Cassette receiver, CD receiver, etc.
■ Speakers cable connection (Stereo Connections) Left output Right output ED IDG BR POWER IN GND BATT LE BRIDGED P.CON(REMOTE) LEFT RIG HT FT RIGHT SPEAKER OUTPUT POWER AMPLIFIER Lead terminal (Commercially available parts) Right speaker Left speaker (Bridged Connections) ED IDG BR POWER IN GND BATT LE BRIDGED P.
Connection ■ Power cable connection 2WARNING To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery’s positive terminal. POWER IN GND BATT BRIDGED P.
Example: One Power Amplifier Is Used Model KAC-728 KAC-628 KAC-528 Maximum Current Drawn 28 A 19 A 16 A Protective Fuse 50 A × 1 [25 A × 2] 30 A × 1 25 A × 1 Cross-sectional Area of Wiring Cable (AWG) 5 mm2 (AWG 10) or greater × 1 3 mm2 (AWG 12) or greater × 1 3 mm2 (AWG 12) or greater × 1 25 A 50 A 25 A 25 A 25 A Installation Self-tapping screw (ø4 × 16 mm) Installation board, etc.
System examples ■ Full-range 2-channel system KAC-728/528 OPERATION FILTER OFF LPF STEREO MONO(Lch) CENTER UNIT L L Left speaker R R Right speaker KAC-628 OPERATION FILTER L+R OFF HPF LPF STEREO MONO(Lch) Switch setting ■ High-power full-range 2-channel system KAC-728/528 OPERATION FILTER OFF LPF STEREO MONO(Lch) L CENTER UNIT KAC-628 R OPERATION FILTER L+R OFF HPF LPF STEREO MONO(Lch) Switch setting L L R R L L R R Left speaker (Bridged) Right speaker (Bridged) ■ Full-ra
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 following table for possible problems. PROBLEM POSSIBLE CAUSE SOLUTION No sound. (No sound from one side.) • Input (or output) cables are • Connect the input (or output) disconnected. cables. • Protection circuit may be • Check connections by referring activated. to "Protection function".
Specifications Specifications subject to change without notice. Audio Section ..............................................KAC-728 Max Power Output (4 Ω) Normal ..............................................................200 W × 2 Bridge ..............................................................600 W × 1 Rated Power Output (4 Ω) Normal (DIN45324, +B=14.4 V) ......................100 W × 2 Bridge (1 kHz, 0.8 % THD) ..............................300 W × 1 Rated Power Output (2 Ω) Normal (1 kHz, 0.
