Toa DA-500F-HL CU - Manual (Page 8)

5. HANDLING PRECAUTIONS
• Keep the input cable away from the output cable. If installed close to each other, oscillation could occur.
• To avoid unit failures, never connect outputs of 2 or more channels in parallel.
• Only connect speakers with an impedance equal to or greater than those specified. Connecting speakers
with a smaller impedance than specified could cause damage to the unit.
• Periodically clean the filter located inside the ventilation panel on the unit's front panel. If the filter becomes
clogged, heat will become trapped inside the enclosure.
• Install the unit in locations where the temperature is between –10°C and +40°C (14°F and 104°F) and the
moisture is less than 90%RH (no dew condensation must be formed).
• To clean, be sure to first turn off this unit's power switch, then wipe with a dry cloth. When the unit gets very
dirty, use a cloth damped in a neutral cleanser. Never use benzene, thinner, alcohol, or chemically-treated
cleaning cloth because such volatile liquids could deform or discolor the unit.
• The fan is a consumable product. As a guideline, we recommend that it be replaced with a new one when its
total operating time reaches approximately 50000 hours (when used in ambient temperatures of
approximately 25°C or 77°F).
Note: The above figure is simply a guideline, and does not guarantee the fan’s operating life. Since
broadcasts from the digital power amplifier could be disabled if the fan malfunctions, the fan requires
regular inspection and maintenance. For maintenance service, please contact the dealer from whom
the digital amplifier was purchased.
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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 Ω output) 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 Ω output), or 550 W x 4 channels (8 Ω
output), or 100 W x 4 channels (4 Ω output) 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.
• Equipped with the LED indicators that show the input/output status, etc.
• Built-in protection circuitry disconnects the power amplifier's output from the load 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)