Sony XM-754HX - Manuel (Page 5)

Features
• Maximum power output of 170 watts per channel
(at 4 il).
• This unit can be used as a bridging amplifier with a
maximum output of 400 wattsr
• Direct connection can be made with the speaker
output of your car audio if it 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 £2) and FH-VOLTAGE mode (2 - 4 £2).
• Protection circuit and indicator provided.
• Pulse power supply* for stable, regulated output
power.
• New circuit which removes the source resistance
from the final MOS FET output stage, and drives
the speaker directly.
* 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 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 might
power supply system provides a highly efficient power
supply with a low impedance output.
Location and Function of Controls
[T] MODE indicator
Indicates HI-CURRENT mode or HI-VOLTAGE mode.
[g POWER/PROTECTOR indicator
• OVER CURRENT lights up in green during normal operation. The color will
chemge 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.
[3] 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.
g] LOW BOOST level control
Turn this control to boost the frequencies around 40 Hz to a maximum of 10
dB.
[5] Cut-off frequency adjustment control
Sets the cut-off frequency (50-200 Hz) for the low-pass or high-pass filters.
[g FILTER selector 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.
[7] Hl-CURRENT/Hl-VOLTAGE mode switch (located on the bottom of the
unit)
Remove the bottom cover to access the switch.
• In FH-CURRENT mode the speaker impedance is 1 to 2 £2. This mode sends a
signal via parallel circuits for a powerful sound
• In HI-VOLTAGE mode the speaker impedance is 2 to 4 £2. In this mode
you can enjoy clear sound with the dynamic range.
MODE POWEB/PROTECTER
m ---------------------- ГП) (• П u и
Ht-CURREKT HHfOLTME OVERCURREMT OFFSET THERMAL
Ш
LEVEL LOW BOOST
о
FILTER
LPF OFF HPF