Sony xm 450 g service manual

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XM-450Ci

SERVICE MANUAL USModel

Canadian Model
AEP Model

UK Model

E Model

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION

50 watts per channel minimum continuous average power into 4 ohms,
both channels driven from 20 Hz to 20 kHz with no more than 0.03%
total harmonic distortion per Car Audio Ad Hoc Committee standards.

Other Specifications
Circuit system OTL (output transformerless) 95 W per channel with
circuit 4-speaker system (20 Hz - 20
pulse power supply kHz, 0.08 "/o THD, at 2 ohms)
Inputs RCA pin jacks 125 W per channel with
Outputs Speaker terminals 4-speaker system (20 Hz - 20
Speaker impedance kHz, 01 % THD, at 1 ohms)
1 - 8 ohms (stereo) 50 W x 2 (20 Hz - 20 kHz, 003 %
2 - 8 ohms (when used as a THD, at 4 ohms) + 190 W x 1
bridging amplifier) (20 Hz - 20 kHz, (108 % THD, at
Maximum output 4 ohms) with 3-speaker system
100 W per channel with 95 W X 2 (20 Hz - 20 kHz, 008 %
4-speaker system (at 4 ohms) THD/ at 2 ohms) + 250 W X 1
200 W per channel with (20 Hz - 20 kHz, 0.] °/o THD, at
4-speaker system (at 2 ohms) 2 ohms) with 3-speaker system
380 W per channel with 190 W per channel with 2-
2-speaker system (at 4 ohms) speaker system (20 Hz - 20 kHz,
500 W per channel with 0.08 °/o THD, at 4 ohms)
2speaker system (at 2 ohms) 250 W per channeI with 2-
Rated outputs (supply voltage at 144 V) speaker system (20 Hz - 20 kHz,
50 W per channel with 0,1 % THD, at 2 ohms)

4-speaker system (20 Hz - 20

kHz, 0-03 % THD, at 4 ohm) - Continued on next page -

STEREO POWER AMPLIFIER
S O N Y;

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Frequency response
5 Hz - 100 kHz (:3 dB)
Harmonic distortion
0.003 % or less
(at lkHz, 4 ohms, 16 W)
Input level adjustment range
0.2 - 2 V
Highvpass filter (INPUT A, B, C and D)
80 Hz, - 12 dB/oct
LOW'paSS filter for subwoofer (INPUT A, B, C and D)
50 Hz, 80 Hz, - 18 dB/oct
Power requirements
12 V DC car battery
(negative ground)
Power supply voltage
105 - 16 V
Current drain at rated output: 27 A
(4 ohms, 40 W X 4) at 10 %
THD: 32 A '
Remote input: 5 mA
Dimensions Approx. 230 X 60 X 360 mm
(w/h/d)
(9 1/s x 2 3/; x 14 /l in.) not incl,
projecting parts and controls
Mass Approx. 4.6 kg (10 lb. 7 oz.) not
incl. accessories
Supplied accessories
Mounting screws (4)
Remote control lead (1)

Design and specifications are subject to change
without notice.

> Features

0 Rated power output of 50 watts per channel (at 4
ohms).

OThe XM-450G can be used as 2 channel amplifier
with a rated output of 190 watts (at 4 ohms).

0 Dual mode connection possible a multl-speaker
system.

0 Protection circuit provided.

0 Pulse power supply for stable, regulated
output power.

0 New circuit which removes the source resistance
from the final MOS FET output stage, and drives
the speaker directly.

0 Twin power supply with rectification circuits for
each channel.

* 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 it 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 air battery. This light weight
power supply system provides a highly efficient power
supply with a low impedance Lilliput.

SECTION 1
GENERAL

Thls sectlon ls extracted from
nstruction manual.

Precaution

tThis unit is designed ior negative ground it v
Dc operation only.

~Use speakers with an impedanru at l to E ohm,
(2 rod ohms when usrd u a bridging amplifier]

~Donoi connocr any active speakrrs iwiih bul -
in nmphiiers) io the speaker terminals of the
null. Doing so many damage the active
speakers.

'Avoxd installing the unit where:

- it would besubiecl In high temperatures such
as irom direct sunlight or hot air iron. the
heater

~n would becxposed to rain or moisture

A ll would besubiecl lo dust or din

rli your cur is parked in dimtsunlighl and there
in considerable rise in temperature inside the
candllow iiu unii in cool down before use,

- When insiaihng the unit horizonially, be sure
not to rnvrr the (ins wirh |ha iloarrnrpei etc.

. it run ml is placed ino dos? lo the car radio,
interkrence may occur in this case, relocate the
amphiror away iron. the cw radio.

- ii no power is being supplied to ihe cassette
player or tuner, check the connectiom.

aThis power amplifier employs a proieriron
drmil to protect the transistors and speakers ii
the ampliiiar maliunriions. Do nor uurmpi to
best the protection rirniils by covering the heat
slnk or ronnrr improper loads.

- Do not use the unit on a weak battery as its
optimum perimmanre depends on a good
power supply,

~Fnrsaiery masons, keep your caraudio volume
mom-raw so Hui! you can still hear sounds
outside your car.

Fuse Replacement

ll the ins. blows, check up. power connection and
replacr the fuse. ii the {use blows again alter
replacement, |hue mny be an in|ernal
maliunrhon. in such a cast, consult your nearest
Sony duler.

Warnlng

When replacing the ruse, hr sure to use one
matching the amperage sraiod above the ins;
holder. Never use n {use wixh an amperage rating
exceeding the one supplied wirh the unit as this
could damage the unit,

Mal

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it you have any queslions or problems concerning
your unir rhar are nol covered in this manual,
please consult your nearest Sony dealer.