Features
� Maximum power output of 80 watts per channel (at 4 ohms). � This unit can be used as a bridging amplifier with a maximum output of 200 watts. � Direct connection can be made with the speaker outputs of your car audio if it is not equipped with the line output (High level input connection). � Built-in variable LPF (Low-pass filter) and HPF (High-pass filter). � Protection circuit*1 and indicator provided. � Pulse power supply*2 for stable, regulated output power.
�1 Protection circuit This amplifier is provided with a protection circuit that activates in the following cases: � when the unit is overheated � when a DC current is generated � when the speaker terminals are short-circuited. The color of the POWER/PROTECTOR indicator will change from green to red, and the unit will shut down. If this happens, turn off the connected equipment, take out the cassette tape or disc, and determine the cause of the malfunction. If the amplifier has overheated, wait until the unit cools down before using again. �2 Pulse power supply This unit has a built-in power regulator which converts the power supplied by the DC 12 V car battery into high speed pulses using a semiconductor switch. These pulses are stepped up by the built-in pulse transformer and separated into both positive and negative power supplies before being converted into direct current again. This is to regulate fluctuating voltage from the car battery. This light weight power supply system provides a highly efficient power supply with a low impedance output.
Location and Function of Controls
1 POWER/PROTECTOR indicator �OFFSET lights up in green during normal operation. The color will change from green to red when the voltage going out to the speaker terminal or the pin Jack is too high. �THERMAL lights up in green during normal operation. The color will change from green to red when the temperature rises to an unsafe level. The color will return to green when the temperature returns to normal. �OVER CURRENT lights up in green during normal operation. The color will change from green to red when receiving a powerful signal. 2 Cut-off frequency adjustment control (FRONT/REAR) Sets the cut-off frequency (50�200 Hz) for the low-pass or highpass filters. 3 FILTER selector switch (FRONT/REAR) When the switch is in the LPF position, the filter is set to lowpass. When in the HPF position, the filter is set to high-pass. 4 LEVEL adjustment control (FRONT/REAR) The input level can be adjusted with this control when using source equipment made by other manufacturers. Turn it to MAX when the output level of the car audio seems low. 5 TEST TONE button To check the system�s status, activate the built-in transmitter then press the TEST TONE button. If the tone is heard, the unit is functioning normally.
(right side/lado derecho/¥k � )
POWER/ PROTECTOR
OFFSET
Ubicación y función de los controles
1 Indicador POWER/PROTECTOR � OFFSET se ilumina en color verde durante el funcionamiento normal. El color cambiará de verde a rojo si la tensión que recibe el terminal de altavoces o la toma de pines es demasiado alta. � THERMAL se ilumina en color verde durante el funcionamiento normal. El color cambiará de verde a rojo si la temperatura alcanza niveles peligrosos. Dicho color volverá a ser verde cuando la temperatura vuelva a ser normal. � OVER CURRENT se ilumina en color verde durante el funcionamiento normal. El color cambiará de verde a rojo al recibirse una señal potente. 2 Control de ajuste de frecuencia de corte (FRONT/REAR) Ajusta la frecuencia de corte (50 � 200 Hz) para los filtros de paso bajo o paso alto. 3 Interruptor de selección FILTER (FRONT/REAR) Si el interruptor se encuentra en la posición LPF, el filtro se ajustará en el paso bajo. Al encontrarse en la posición HPF, el filtro se ajusta en el paso alto.
227
Cut-off frequency/Frecuencia de corte/�I�
dB
10 0 -10
Wâ� v
Circuit Diagram/Diagrama de circuitos/�q� ��
FILTER
HPF Normal Power AMP OFF LPF
THERMAL
OVER CURRENT
Lch
(MONO)
LEVEL
Lch
(left side/lado izquierdo/¥� � )
-20 -30
50Hz 80Hz 150Hz 200Hz
HIGH PASS
LOW PASS
200Hz 150Hz 80Hz 50Hz
FILTER
LPF OFF HPF
LEVEL TEST TONE
MIN MAX
-40 -50 -60 -70 -80
TEST TONE
FILTER
HPF Inverted Power AMP
MONO
Rch
10 100 1k
OFF LPF
50Hz 200Hz
LEVEL
Rch
FREQUENCY
Hz
Installation
Before Installation
� Mount the unit either inside the trunk or under a seat. � Choose the mounting location carefully so the unit will not interfere with the normal movements of the driver, and where it will not be exposed to direct sunlight or hot air from the heater. � Do not install the unit under the floor carpet, where the heat dissipation from the unit will be considerably impaired. First, place the unit where you plan to install it, and mark the positions of the four screw holes on the surface of the mounting board (not supplied). Then drill the holes approximately 3 millimeters (mm) in diameter and mount the unit onto the board with the supplied mounting screws. The supplied mounting screws are 15 mm long. Therefore, make sure that the mounting board is thicker than 15 mm.
