Sony XM-255EX User Manual download pdf (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

OFFSET

THEfIMAL

(left side/cóte gauche)

FILTER

TEST TONE

Cut-off frequencyfFréquence de coupure

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Sony XM-255EX User Manual Page 10

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