4
• The unit is designed exclusively to be mounted in
an equipment rack. Be sure to follow the
instructions below when rack-mounting the unit.
Failure to do so may cause a fire or personal injury.
· Install the equipment rack on a stable, hard floor.
Fix it with anchor bolts or take other arrangements
to prevent it from falling down.
· Be sure to use the screws with a diameter of over
5 mm (0.2") and length of over 12 mm (0.47") to
mount the unit.
· When connecting the unit's power cord to an AC
outlet, use the AC outlet with current capacity
allowable to the unit.
When the Unit is in Use
• With the HPF ON/OFF switch kept to the OFF
position (factory preset), operating the unit for long
periods of time while the Peak indicator is
illuminated due to excessive input signal may
damage the connected speakers, possibly resulting
in fire. Operating the unit with the HPF ON/OFF
switch set to the ON position may decrease the
possibility of speaker damage or fire due to
excessive input signal.
• Make sure that all volume controls are set to
minimum position before power is switched on.
Loud noise produced at high volume when power is
switched on can impair hearing.
• Do not operate the unit for an extended period of
time with the sound distorting. This is an indication
of a malfunction, which in turn can cause heat to
generate and result in a fire.
• Contact your TOA dealer as to the cleaning. If dust
is allowed to accumulate in the unit over a long
period of time, a fire or damage to the unit may
result.
• If dust accumulates on the power supply plug or in
the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall
outlet securely.
• Switch off the power, and unplug the power supply
plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or
more. Doing otherwise may cause a fire or electric
shock.
3. GENERAL DESCRIPTION
TOA's DA-550F Multichannel Power Amplifier features high power handling of 550 W x 4 channels (4 Ω
output) or 350 W x 4 channels (8 Ωoutput) and durability. TOA's DA-500F-HL Multichannel Power Amplifier
features high power handling of 500 W (70 V line) x 4 channels (9.8 Ωoutput), or 550 W x 4 channels (8 Ω
output), or 100 W x 4 channels (4 Ωoutput) and durability.
Channels 1 and 2, and 3 and 4 are made available for bridge connection individually, allowing the DA-550F to
be used as a 1,100 W (8 Ω) X 2 channels amplifier, or the DA-500F-HL as a 1,000 W (140 V line) x 2
channels (19.6 Ω) amplifier or 1,100 W x 2 channels (16 Ω) amplifier. When a bridge connection is made,
each model can be used as a 2-channel stereo amplifier or as a 3-channel amplifier.
Their wide range of applications include stores and permanent sound systems.
4. FEATURES
• 2U rack mounting size*.
• Low power consumption and light weight.
• An input signal to Channel 1 can be routed to all channels, and the output level adjusted using the input level
control for each channel.
• Electronically-balanced inputs.
• Input terminals employ removable terminal blocks and XLR type connectors to provide maximum connection
ease.
• Input/output status LED indicators for each channel.
• Built-in protection circuitry disconnects the output when a short circuit, overload, or unusual temperature rise
occurs.
• Equipped with the terminals used for internal information monitoring (power supply, protection status, and
fan operation) and power ON/OFF control from external equipment.
* 1U size = 44.5 mm or 1.75" (reference size)
An all-pole mains switch with a contact
separation of at least 3 mm (0.12") in each pole
shall be incorporated in the electrical
installation of the building.
The lighting flash with arrowhead symbol,
within an equilateral triangle, is intended
to alert the user to the presence of
uninsulated "dangerous voltage" within
the product's enclosure that may be of
sufficient magnitude to constitute a risk of
electric shock to persons.