TOA DA-250FH 4-Channel Digital Power Amplifier 250 watt per Channel 70V


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  • Introducing TOA's DA-250FH power amplifier. 4x 250W (70V) Featuring 4 high power outputs, advanced digital technology and compact, lightweight design, these versatile amplifiers are perfect solutions for virtually any installed sound application.

    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-250FH is 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.

    High-efficiency amplifier topology.
    TOA's proprietary amplifier topology achieves approximately 85% efficiency in AC mains to output power conversion. The high-efficiency, compact design operates at much lower temperature levels eliminating the need for large heat sinks.

    Amplifier design optimized for installed sound applications
    This is specifically designed to produce high power with high efficiency. Along with switching mode power supplies, the amplifiers also offer the high power advantages of Pulse Width Modulation (PWM) which requires much smaller power supply voltage than conventional amplifier designs.

    Two configurations suit different applications.
    A highimpedance version, the DA-250FH, is available for 70/100 volt application.

    Easily accommodates high power requirements.
    Both amplifiers can be conveniently bridged* (Channels 1/2 and 3/4 bridgeable), increasing the output from 250W into 4 channels up to 500W into 2 channels.

    Versatile enough for any venue.
    Both amplifiers are well-suited for a wide variety of installed sound requirements. The DA-250FH is ideal for venues ranging from exhibition halls, sports facilities and gymnasiums to houses of worship and meeting halls and many other locations. The DA-250FH proves ideal for sound reinforcement in multi-zone multi-zone applications such as presentation and press conference rooms as well as restaurants and similarly sized locations.

    Compact dimensions facilitate installation
    The DA-250FH amplifiers occupy only one standard rack space and weight only 6.6kg (14.6 lbs) allowing flexible installation options. For complex installed sound applications, amplifiers can be stacked together, requiring only one perforated airflow panel between every 5 units. The amplifiers are also equipped with dual low-noise constant speed fans to ensure adequate cooling in demanding environments and extend operational reliability and service life.


    • 4x 250W (70V)
    • 2x 500W bridged (140V)
    • Limiter and High pass filter
    • 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 (14.6 to 19.4 lbs.)
    • Independent power supply for each channel
    • Low heat dissipation
    • Recessed stepped attenuators
    • Comprehensive protection circuitry
    • Removable dust filters for easy maintenance
    • Optional isolation transformer, model MT-251H
    • Five year warranty
  • Number of channels4
    Total output all channel driven70V (1kHz, 19.6Ω)
    Output voltage per channel70V (1kHz, 19.6Ω)
    Output current per channel3.6A(1kHz,19.6Ω)
    Power output
    Hi-Z: 70V/100V per channel
    Hi-Z: 140V bridged, per channel
    Power consumption*
    Idle Power Consumption
    1/8 Power 70 Volts
    1/3 Power 70 Volts
    1/8 Power 70 Volts
    1/3 Power 70 Volts

    58W, 1.0A
    265W, 4.1A
    609W, 8.5A
    224W, 3.6A
    499W, 7.2A
    Frequency response20Hz – 20kHz, ±1dB (H.P.F.OFF)
    50Hz – 20kHz, –3/+0dB (H.P.F. ON)
    Total harmonic distortion (THD) (1kHz)0.1 %
    S/N ratio (A weighted)100dB
    Crosstalk at 10kHz (A weighted)70dB
    DC offset*±5mV
    Voltage gain*35.1dB
    Damping factor*120
    Input impedance
    Input Sensitivity
    Input Clipping

    10kΩ (unbalanced), 20kΩ (balanced)
    14V (25.1dBu)
    Front panel
    Gain Controls
    Indicators per channel: Input

    30 position detent
    Green LED
    Yellow LED
    Red LED
    Red LED
    Blue LED
    Rear panel
    Input Connectors
    Speaker Output

    Detachable Euro style connector (electrically balanced)
    Screw terminal (M4). Accept AWG14-22
    Protection circuit Amplifier section
    Power supply section
    DC output, overheat protection, load shorting, overload current, maximum output
    Overheat protection, AC rush current
    CoolingContinuously constant speed fan with front-to-rear airflow,
    50,000 hours life time
    Power requirementAC mains, 50/60Hz
    Dimensions (W × H × D)482mm (19) × 44mm (1.7) × 401mm (15.8) (EIA Standard 19-inch rack mount width)
    FinishPanel: Aluminum, alumite process, black
    Case: Steel sheet
    AccessoryEuro style terminal block connector (3-pin) × 4, Volume control cover × 4
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