Sony XM-754HX Owner’s Manual

SONY. 3002.3_.11_1_

Stereo Power

Amplifier

Operating Instructions

Owner's Record

The model and serial numbers are located on the bottom of the unit.
Record the serial number in the space provided below.

Refer to these numbers whenever you call upon your Sony dealer regarding this product.

Model No. XM-754HX Serial No.

XM-754HX

Sony Corporation ©1997 Printed inJapan

Features

• Maximmn power output ot IYUwaits pu_ chaJ,wl

(at 4 _).

• This unit can be used as a bridging amplifier with a

• Ne\\ t lrt'uit which lenlo\es the soullc lesistancL'

from the final MOS FET output stage, and drives
the speaker directly.

maximum output of 400 watts.

• Direct connection can be made with the speaker
output of your car audio ifit is not equipped with a

line output (High level input connection).

• Built-in variable LPF (Low-pass filter), HPF (High-
pass filter) and low boost circuit.

• Possible to switch between HI-CURRENT mode (1-
2 _) and HI-VOLTAGE mode (2- 4f2).

• Protection circuit and indicator provided.

• Pulse power supply* for stable, regulated output
power.

* Pulse power supply

This unit has a built-in power regulator which couw'rts the
power supplied by the DC 12 V ear 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

[] MODE indicator

Indicates HI-CURRENT mode or Eli-VOLTAGE mode.

[] POWER/PROTECTOR indicator

• OVER CURRENT lights up in green during normal operation. I he colo_ will
change from green to amber when receiving a powerful signal.

• OFF SET lights up green during normal operation. The color will change from
green to amber 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 amber when the temperature rises to an unsafe level. The color

will return to green when the temperature returns to normal.

[] 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.

[] LOW BOOST level control

Turn this control to boost the frequencies around 40 Hz to a maximum of 10
dB.

[] Cut-off frequency adjustment control

Sets the cut-off frequency (50-200 Hz) for the low-pass or high-pass filters.

[] FILTERselector switch

When the switch is in the LPF position, the filter is set to low-pass. When in
the HPF position, the filter is set to high-pass.

[] HI-CURRENT/HI-VOLTAGE mode switch (located on the bottom of the

unit)

Remove the bottom cover to access the switch.

• In HI-CURRENT mode the speaker impedance is 1 to 2 fL This mode sends a
signal via parallel circuits for a powerful sound

• In HI-VOLTAGE mode the speaker impedance is 2 to 4 f_. In this mode
you can enjoy clear sound with the dynamic range.

MODE PowER/PR61:EcT'ER........

[HbCURRENT HI'VOLTAGEJ[OVERCURRENT OFFSET THERMAL /

FILTER

LEVEL LOWB00ST LPF OFF HPF

0 0 • 0

Troubleshooting Guide

The following checklist will assist in the correction ol most pzobJcms which } ou ma} c_lvuu*ltct *_ith } uuJ u* .t,

Before going through the checklist below, refer to the connection and operating procedures.

Problem Cause/Solution
The POWER/PROTECTOR The fuse is blown. --_ Replace the fuse with a new one.

indicator does not light up. The ground lead is not securely connected. ---*Fasten the ground lead securely

The OVER CURRENT indicator light up

in amber.

The OFFSET indicator lights up in

amber.

The THERMAL indicator lights up in
amber.

Alternator noise is heard.

The sound is muffled.
The sound is too low.

to a metal point of the car.
The voltage going into the remote terminal is too low.

• The connected master unit is not turned on. ---*Turn on the master unit.

• The system employs too many amplifiers. ---+ Use a relay.
Check the battery voltage (10.5 - 16 V).
Turn off the power switch. The speaker outputs are short-circuited. _ Rectify

the cause of the short-circuit.

Turn off the power switch. Make sure the speaker cord and ground lead are
securely connected.

The unit heats up abnormally.

• Use speakers with suitable impedance.

- HI-CURRENT mode: 1 to 8 fL

- HI-VOLTAGE mode: 2 to 8 ft.
Use HI-CURRENT mode to reduce generated heat.

• Make sure to place the unit in a well ventilated location.

The power connecting leads are installed too close to the RCA pm cords. -+
Keep the leads away from the cords.

The ground lead is not securely connected. ---+ Fasten the ground lead securely
to a metal point of the car.

Negative speaker leads are touching the car chassis. ---+Keep the leads away
from the car chassis.

The FILTER switch is set to the "LPF" position.

The level adjustment control is set to the "MIN" position.

LOW BOOST

dB

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FREQUENCY Hz

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Circuit Diagram / Scheme du circuit

Normal

(MONO)

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Invened

Cut-off frequency/Frequence de coupure

dB

....

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FREQUENCY Hz

FILTER

._ _,_

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FILTER i ,

OFFo (_Rch

Installation

Before Installation

• Mount the unit either inside the t_unk o_ u* [dc'r a
seat.

• Choose the mounting location carefully so the unit
will not interfere with the normal movements of the

driver and 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 3millimeters (ram) 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 ram.

Unit : mm (in.)
Unite: mm (po.)

f

50 (2)

T,_ 270 (10 _h) _-=

320 (12 _h)

) o

¢N

,4
=

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