Multi-Channel Power Amplifier - 4 x 250W @ 70V

Multi-Channel Power Amplifier - 4 x 250W @ 70V

Multi-Channel Power Amplifier - 4 x 250W @ 70V


The DA-250FH is a 4-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 4 channels (19.6 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).

UL certification

Power Source 120 V AC, 50/60 Hz
Amplification System Class D
Power Consumption 200 W (based on UL/CSA standards)
1200 W (rated output 70 V line, 19.6 Ω × 4)
Input 4 circuits, +4 dB* (1.23 V) (input level control in maximum position),
10 kΩ, electronically-balanced, removable terminal block (3 pins)
CH 1 mode ON/OFF switch (ON: CH 1 to All ch, OFF: Each ch)
Rated Output 4 channels: 250 W × 4 (70 V line, 19.6 Ω)
2 channels (BRIDGE): 500 W × 2 (140 V line, 39.2 Ω)
M4 screw terminal, distance between barriers: 8.8 mm
Frequency Response 20 - 20,000 Hz (±1 dB): HPF OFF/50 - 20,000 Hz (-3 dB, +1 dB): HPF ON
(selectable with the inner jumper)
Total Harmonic Distortion 0.1% (1 kHz), 0.3% (20 - 20,000Hz): HPF OFF
0.1% (1 kHz), 0.3% (100 - 20,000 Hz): HPF ON
Protection Circuit Protection against excessive current flow due to overload,
short circuit, unusual DC voltage output,
temperature rise at power amp. heat sink (110℃ or more),
temperature rise inside the unit (80℃ or more)
S/N Ratio 100 dB (A-weighted)
Crosstalk 70 dB (A-weighted)
LED Indicator Power (blue) × 1, Input (green) × 4, Output (yellow) × 4,
Peak (red) × 4, Protect (red) × 4
Cooling Forced air cooling
Operating Temperature -10℃ to +40℃
Operating Humidity 90% RH or less (no condensation)
Finish Panel: Aluminum, black, alumite Case: Plated steel sheet
Dimensions 482 (W) × 44 (H) × 401.8 (D) mm
Weight 6.6 kg
Accessory Power cord (2 m) …1, Removable terminal plug (3 pins) …4,
Tamper-proof cap …4
Option Matching transformer: MT-251H

The DA Series multi-channel digital power amplifiers are ideal for multi-zone distributed speaker systems and professional sound applications. Engineered with Class D technology, the new DA Series amplifiers operate at 85 percent efficiency and consume almost one-third less power than conventional analog amplifiers. The compact and lightweight single or dual rack-space design and ultra-low heat dissipation allow designers to rack-mount up to five units without open space between units.

The DA Series is comprised of high and low impedance four-channel models each equipped with an independent power supply for each channel to assure continuous operation and unmatched reliability and performance. Other features include recessed stepped attenuators for precise gain calibration, removable dust filters for easy maintenance, and optional isolation transformer.

Competitively priced, the new DA Series multi-channel power amplifiers are backed by TOA's five-year warranty.

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