Sony XM-ZR704 Operating Instructions

4-113-731-11 (1)
Stereo Power Amplifier
Operating instructions
XM-ZR704
©2008 Sony Corporation Printed in Thailand
Features
* Pulse power supply
 Maximum power output of 150 W per channel (4)
This unit has a built-in power regulator which converts the
(at 4 Ω).
power supplied by the 12 V DC car battery into high speed
 This unit can be used as a bridging amplifier with a
pulses using a semiconductor switch. These pulses are
maximum output of 350 W.
stepped up by the built-in pulse transformer and separated
Built-in LP (low-pass) filter, HP (high-pass) filter,

into both positive and negative power supplies before
Subsonic filter and Low boost circuit.
being converted into direct current again. This is to
Protection circuit and indicator provided.

regulate fluctuating voltage from the car battery. This light
Direct connection can be made with the speaker

weight power supply system provides a highly efficient
output of your car audio unit if it is not equipped
power supply with a low impedance output.
with the line output (High level input connection)
Hi-level Sensing Power On feature allows unit to be

activated without need for REMOTE connection.
 Pulse power supply* for stable and regulated output
power..
Specifications
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
70 watts per channel minimum continuous average power into 4 ohms, both
channels driven from 20 Hz to 20 kHz with no more than 1 % total harmonic
distortion per Car Audio Ad Hoc Committee standards.
Other Specifications
Circuit system OTL (output transformerless) Low-pass filter 50 - 300 Hz, 12 dB/oct
circuit High-pass filter 50 - 300 Hz, 12 dB/oct
Pulse power supply Subsonic filter 6 - 70 Hz, 12 dB/oct
Inputs RCA pin jacks Low boost 0 - 10 dB (40 Hz)
High level input connector Power requirements 12 V DC car battery
Input level adjustment range (negative ground)
0.3 – 6 V (RCA pin jacks), Power supply voltage 10.5 – 16 V
3 – 12 V (High level input) Current drain at rated output: 45 A
Outputs Speaker terminals (4 Ω, 70 W × 4)
Speaker impedance 2 – 8 Ω (stereo) Remote input: 1 mA
4 – 8 Ω (when used as a bridging Dimensions Approx. 424 × 55 × 248 mm
amplifier) (16 3 / × 2 1 / × 9 7 / in)
4 4 8
Maximum output 2 Speakers: 350 W × 2 (at 4 Ω) (w/h/d) not incl. projecting parts
4 Speakers: 150 W × 4 (at 4 Ω) and controls
Rated output Mass Approx. 3.1 kg (6 lb 14 oz) not incl.
(supply voltage at 14.4 V, 20 Hz-20 kHz, 1 % THD) accessories
2 Speakers: Supplied accessories Mounting screws (4)
160 W × 2 (at 4 Ω) High level input cord (1)
4 Speakers: Protection cap (1)
80 W × 4 (at 2 Ω)
Design and specifications are subject to change
70 W × 4 (at 4 Ω)
Frequency response 10 Hz – 100 kHz ( dB) without notice.
Harmonic distortion 0.05 % or less (at 1 kHz, 4 Ω)
CEA2006 Standard
 Packaging cushions are made from paper.
Power Output: 70 Watts RMS × 4 at 4 Ohms <
 Halogenated flame retardants are not
used in cabinets. 1 % THD+N
 Halogenated flame retardants are not SN Ratio: 93 dBA (reference: 1 Watt into
4 Ohms)
used in printed wiring boards.
Dimensions / /
55
424 (16 3 / ) (2 1 / ) Unit: mm (in)
4 4
354 (14)
354 (14) ø 6 ( 1 / )
4
Troubleshooting Guide
The following checklist will assist in the correction of most problems which you may encounter with your unit.
Before going through the checklist below, refer to the connection and operating procedures.
Problem Cause/Solution
The POWER/PROTECTOR indicator
The fuse is blown.  Replace the fuse with a new one.
does not light up.
The ground wire is not securely connected.
 Fasten the ground wire securely to a metal point of the car.
The voltage going into the remote terminal is too low.
 The connected car audio unit is not turned on.
 Turn on the car audio unit.
 The system employs too many amplifiers.  Use a relay.
Check the battery voltage (10.5 – 16 V).
The POWER/PROTECTOR indicator will Turn off the power switch. The speaker outputs are shorted.
change from green to red.  Rectify the cause of the short.
Turn off the power switch. Make sure the speaker cord and ground wire are
securely connected.
The unit heats up abnormally.
 The unit becomes abnormally hot.
 Use speakers with suitable impedance.
 2 – 8 Ω (stereo), 4 – 8 Ω (when used as a bridging amplifier).
 Make sure to place the unit in a well ventilated location.
 The sound is interrupted. The thermal protector is activated.  Reduce the volume.
Alternator noise is heard. The power connecting wires are installed too close to the RCA pin cords.
 Keep the wires away from the cords.
The ground wire is not securely connected.
 Fasten the ground wire securely to a metal point of the car.
Negative speaker wires are touching the car chassis.
 Keep the wires away from the car chassis.
The LPF switch is set to the "ON" position.
The sound is muffled.
 When connecting the full range speaker, set to "OFF" position.
The Filter switch is set to the "LP" position.
 When connecting the full range speaker, set to "OFF" or "HP" position.
The sound is too low. The LEVEL adjustment control is not appropriate. Turn the LEVEL adjustment
control in the clockwise direction.
Location and Function of Controls
 POWER/PROTECTOR indicator  Cut-off frequency adjustment control
Lights up in green during operation. Set the cut-off frequency (50 - 300 Hz) for the low-
When the PROTECTOR is activated the indicator pass or high-pass filter.
will change from green to red.  FILTER selector switch
When the PROTECTOR is activated refer to the
When the switch is in the LP position,the filter is set
Troubleshooting Guide.
to low-pass. When the switch is in the HP position,
 SUBSONIC FILTER cut-off frequency the filter is set to high-pass.
adjustment control
 LOW BOOST level control
Set the cut-off frequency (6 - 70 Hz) for the
Turn this control to boost the frequencies around
subsonic filter.
40 Hz to a maximum of 10 dB.
 LEVEL adjustment control
The input level can be adjusted with this control.
Turn it in the clockwise direction when the output
level of the car audio unit seems low.
Precautions
This unit is designed for negative ground 12 V DC Warning

operation only. When replacing the fuse, be sure to use one matching
 Use speakers with an impedance of 2 to 8 Ω the amperage stated above the fuse holder. Never use
(4 to 8 Ω when used as a bridging amplifier). a fuse with an amperage rating exceeding the one
 Do not connect any active speakers (with built-in supplied with the unit as this could damage the unit.
amplifiers) to the speaker terminals of the unit.
Doing so may damage the active speakers.
Avoid installing the unit in areas subject to:

— high temperatures such as from direct sunlight
or hot air from the heater
— rain or moisture
— dust or dirt.
If your car is parked in direct sunlight and there is a

considerable rise in temperature inside the car,
allow the unit to cool down before use.
 When installing the unit horizontally, be sure not to
cover the fins with the floor carpet etc.
* Protection circuit
 If this unit is placed too close to the car audio unit
This amplifier is provided with a protection circuit that
or antenna, interference may occur. In this case,
operates in the following cases:
relocate the amplifier away from the car audio unit
— when the unit is overheated
or antenna.
— when a DC current is generated
If no power is being supplied to the car audio unit,

— when the speaker terminals are short-circuited.
check the connections.
The color of the POWER/PROTECTOR indicator will change
This power amplifier employs a protection circuit*

from green to red, and the unit will shut down.
to protect the transistors and speakers if the
If this happens, turn off the connected equipment, take out
amplifier malfunctions. Do not attempt to test the
the cassette tape or disc, and determine the cause of the
protection circuits by covering the heat sink or malfunction. If the amplifier has overheated, wait until the
connecting improper loads. unit cools down before use.
 Do not use the unit on a weak battery as its
If you have any questions or problems concerning
optimum performance depends on a good power
your unit that are not covered in this manual, please
supply.
 For safety reasons, keep your car audio unit volume consult your nearest Sony dealer.
moderate so that you can still hear sounds outside
your car.
Fuse Replacement
If the fuse blows, check the power connection and
replace both the fuses. If the fuse blows again after
replacement, there may be an internal malfunction. In
such a case, consult your nearest Sony dealer.