TOA DA-250DH CU Digital Power Amplifier 2X 250W 70V 1X 500W Bridged at 140V (1U)

The DA-250DH is a 2-Channel Digital Power Amplifier designed for 70 V line high-impedance distribution and features lightweight, compact, high power output, and high efficiency. It delivers 250 W x 2 channels (40 Ω output) using a switching power supply. Each channel is equipped with an independent power section. It can be electrically isolated from the high-impedance speaker system by attaching the MT-251H Output Transformer (optional). It can be mounted in an EIA Standard equipment rack (1 unit size).

Features:

• 70 V speaker outputs
• 2x 250 W rated power
• Class D design 85 % efficient
• Independent power supply for each channel
• Light weight and compact
• Stack up to 5 units without open spaces between units
• Selectable stereo or bridge operation (DA-250D)
• Forced-air cooling system
• Low heat dissipation
• Comprehensive protection circuitry
• Removable dust filters for easy maintenance

The dual-channel power amplifier shall use digital class-D circuit topology and shall be configurable to allow two, three or four channel operation. Power output in two-channel mode with all channels driven shall be: 250W per channel into 40 ohms (100V). Total harmonic distortion (THD) shall be less than 0.1% (1kHz), 0.3 % (100 to 20,000 Hz). The frequency response shall be 50 to 20,000 Hz (-3 dB, +1 dB). 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 1-2 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 other channel. Each input shall feature a 3 pin phoenix block and XLR connector. Rear panel output connector shall be a heavy-gauge 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 two 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 at 40 ohms load), peak clipping, and protection circuit activation. The front panel shall also have two 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 100°C or excessive temperature inside the unit over 80°C via a relay for each channel. The relay shall also delay amplifier connection to the load during turn-on for about 2 seconds, so as to prevent any occurrence of noise at turn-on. Power consumption shall be 120W (based on EN standards) and 580W (rated output 40 ohms x 2 channels).

Package includes:

• Power Amplifier
• Power cord (2 m (6.56 ft) x 1
• Removable terminal plug (3 pins) x 2
• Tamper-proof cap x 2

For more information, please see Data Sheet