General Information

Manufacturer

TOA Electronics

Manufacturer Part Number

DA-550F

Product Name

DA Series Multi-channel Digital Amplifier

Marketing Information

The multi-channel power amplifier shall use class-D circuit topology and shall be configurable to allow two, three or four channel operation. Power output in four-channel mode with all channels driven shall be: 550 W at 4 ohms and 350 W at 8 ohms. Each pair of channels shall be independently bridgeable to produce 1100 W at 8 ohms. Total harmonic distortion (THD) shall be less than 0.1% @ 1 kHz, 0.15 % (20 to 20,000 Hz). The frequency response shall be 20 to 20,000 Hz (3 dB). The signal to noise ratio shall be 100 dB (A-weighted). The crosstalk shall be 70 dB (A-weighted). The input impedance shall be 10k ohms for each input into an electronically balanced input circuit. Rear panel switches shall allow selection of bridged operation for each pair of channel (1-2 and 3-4) independent of the status of the other pair of channels. A rear channel input mode switch shall allow the selection of input 1 to all mode, whereby the signal from input 1 is simultaneously fed to all other channels. Each input shall feature a 3 pin phoenix block and XLR connector. Rear panel output connector shall be a heavygauge M4 screw-terminal barrier strip suitable for use with spade lugs
or up to #12 AWG bare wires. The front panel attenuators shall be recessed to prevent accidental level changes and may be removed and replaced by included security covers once levels have been
properly set. The front panel shall have four sets of four LED indicators to indicate the following conditions: signal presence at input (greater than -20 dB), signal presence at output (greater than 1 W @ 8 ohms load), peak clipping and protection circuit activation. The front panel shall also have four removable air filters that may be removed for cleaning without removing the amplifier from the rack. The amplifier shall be forced-air fan cooled with the air intake at the front and exhaust at the rear.

Built-in protection circuitry shall monitor voltage and current levels to minimize potential damage from overloads, and disable output during shorts, DC offset, or excessive operating temperature at power amp heat sink over 212°F (100°C), or excessive operating temperature at power supply heat sink over 176°F (80°C) via a relay for each channel. The relay shall also delay amplifier connection to the load during turnon for about 2 seconds, so as to prevent any occurrence of noise at turn-on. Power consumption shall be 480 W (based on UL/CSA standards) and 2800 W (rated output 4 ohms x 4 channels), and 1650 W (rated output at 8 ohms x 4 channels). Each channel shall be equipped with control/monitor terminals to permit power on/off control of each channel, status monitoring of power on/off and protection for each channel and fan operation.

The control panel and monitor display shall be a custom made non-TOA piece. The control/monitor connection shall be made via two RJ-45 connectors.

The amplifier shall use two standard rack-spaces or 3.48" (88.4 mm) and its dimensions shall be 18.98" (W) x 3.48" (H) x 15.91" (D) (482 x 88.4 x 404.2 mm) . Front panel finish shall be black anodized aluminum and case finish shall be sheet steel. Weight shall be 19.4 lb (8.8 kg).

Features

• 4x 500W (4 ohms)/4x 350W (8 ohms)/2x 1100W bridged (8 ohms)/2x 700W bridged (16 ohm) Power Output
• Class D design – 85% efficient!
• 30% lower power consumption than conventional amplifiers
• Compact, single or dual rack-space design
• Stack up to 5 units without open spaces between units
• Lightweight (19.4 lbs.)
• Independent power supply for each channel
• Low heat dissipation
• Recessed stepped attenuators
• Comprehensive protection circuitry
• Removable dust filters for easy maintenance

Specifications

Power Source