Sony XM-255EX - Manuel (Page 10)

Features
• Maximum power output of 120 watts per channel
(at 4 ohms).
• This unit can be used as a bridging amplifier with a
maximum output of 300 watts.
• Direct connections can be made with the speaker
outputs of your car audio if if is not equipped with
the line output (High level input connection).
• Built-in variable LPF (Low-pass filter).
• Dual mode connection possible for a multi-speaker
system.
• Protection circuit*' and indicator provided.
• Pulse power supply*- for stable, regulated output
power.
*2 Pulse power supply
This unit hns a built-in power regulator which coiwerts the
poiver supplied by the DC 12 V car haticnj into hi^h speed
pulses using a semiconductor switch. Tlwse pulses are
stepped up by the built-in pulse transformer and separated
into bath ffositive and negative power supplies before being
conz’crted into direct current again. This is to regulate
fluctuating voltage from the car battery. This light weight
¡HJiver supply system proi'ides a highly efficient power
supply with a loto impedance output.
*7 Protection circuit
This amplifier is provided with a protection circuit that
actiiHifes in the following cases:
— zvhen the unit is oxvrheated
— zvhen a DC current is generated
— zvhen the speaker terminals are short-circuited.
The color of the POWER/PROTBCTOR indicator will
change from green to red, and the unit will shut down.
If this luzppens, turn off the connected equipment, take out
the cassette tape or disc, and determine the cause of the
malfunction. If the amplifier has ozvrheated, zvait until the
unit cools down before using again.
Location and Function of Controls
Q] 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.
LEVEL adjustment control
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.
[3] Cut-off frequency adjustment control
Sets the cut-off frequency (50-200 Hz) for the low-pass filter.
l4l FILTER selector switch
When the switch is in the LPF position, the filter is set to low-pass.
[g 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.
LEVEL
(right side/côte droit)
POWER/PHOTECTOR
О
OFFSET
О
THEfIMAL
О
Ш
(left side/cóte gauche)
FILTER
TEST TONE
Ф
Cut-off frequencyfFréquence de coupure
de