MA250.4

The Ashly MA250.4 is a four-channel, high-efficiency Class-D power amplifier designed for professional audio installations and multi-zone sound systems. Delivering 250 watts per channel, it features intelligent power sharing, selectable low-impedance and constant-voltage operation, and integrated protection functions. Its compact 2U rackmount design makes it suitable for commercial audio systems, theatres, educational facilities, and houses of worship.

From The Manufacturer:

The Ashly MA Series combines proprietary D-MAX™ amplifier technology with intelligent power sharing to provide efficient, reliable amplification. The MA250.4 can distribute available power dynamically across groups of four channels, allowing unused capacity to be allocated to channels with greater demand.

Each channel supports selectable low-impedance operation at 2, 4, or 8 ohms, or constant-voltage operation at 25 V, 70 V, or 100 V. The amplifier also includes removable Euroblock input and output connections, remote volume-control ports, switchable high-pass filters, clip limiters, and front-panel status indicators.

Key Features:

1. Four-channel professional power amplifier.

2. High-efficiency D-MAX™ Class-D amplifier technology.

3. 250 W per channel with power sharing disabled.

4. Intelligent power sharing across four channels.

5. Up to 450 W available to a channel under supported power-sharing conditions.

6. Selectable 2 Ω, 4 Ω, and 8 Ω low-impedance operation.

7. Selectable 25 V, 70 V, and 100 V constant-voltage operation per channel.

8. Bridged operation for compatible channel pairs.

9. Switchable 80 Hz high-pass filter per channel.

10. Switchable clip limiter per channel.

11. Removable Euroblock input and output connectors.

12. Remote volume-control ports for each channel.

13. Remote standby control.

14. Front-panel level controls and power/standby switch.

15. Lockout function to prevent unauthorised changes.

16. LED indicators for signal, peak/mute, temperature, protection, power, current, bridging, and power-sharing status.

17. SailFlow™ directed fan-cooling system.

18. Compact 2U rackmount chassis.

Specifications:

• Brand: Ashly

• Model: MA250.4

• Product Type: Professional power amplifier

• Amplifier Class: Class D

• Number of Channels: 4

• Rated Output Power: 250 W per channel

• Low-Impedance Output: 250 W per channel at 2 Ω, 4 Ω, or 8 Ω with power sharing disabled

• Bridged Output: 500 W per bridged channel pair at 4 Ω or 8 Ω, subject to supported operating conditions

• Constant-Voltage Output: 250 W per channel at 25 V, 70 V, or 100 V

• Power Sharing: Intelligent allocation of available power across groups of four channels, up to 450 W to a channel under supported conditions

• Input Connectors: Removable Euroblock

• Output Connectors: Removable Euroblock

• Input Impedance: 10 kΩ

• Maximum Input Level: +21 dBu

• Frequency Response: 20 Hz–20 kHz, ±0.05 dB

• Signal-to-Noise Ratio: Greater than 105 dB in low-impedance mode, unweighted

• THD+N: Less than 0.2% at 8 Ω, 10 dB below rated power, 20 Hz–20 kHz

• Typical SMPTE Distortion: Less than 0.5%

• Channel Separation: -75 dB at 1 kHz, measured from full output

• Damping Factor: Greater than 250 at 8 Ω, below 1 kHz

• Input Sensitivity: 3.16 V (+12.2 dBu) at 26 dB gain; 1.00 V (+2.2 dBu) at 36 dB gain

• High-Pass Filter: Switchable 80 Hz per channel

• Clip Limiter: Switchable per channel

• Remote Control: Individual remote volume-control ports and remote standby input

• Cooling: SailFlow™ directed fan cooling

• Rack Format: 2U, 19-inch rackmount

• Dimensions: Manufacturer specification should be confirmed against the current manual before publishing exact measurements

• Weight: Manufacturer specification should be confirmed against the current manual

Included Accessories:

• Ashly MA250.4 power amplifier.

• Removable Euroblock input and output connectors, subject to the supplied package configuration.

• AC power connection.

Applications:

• Commercial multi-zone audio systems.

• Retail stores and shopping centres.

• Restaurants, bars, and hotels.

• Houses of worship.

• School auditoriums and educational facilities.

• Theatres and performance venues.

• Conference rooms and meeting facilities.

• Background music and paging systems.

• Distributed loudspeaker systems using compatible 25 V, 70 V, or 100 V lines.

• Multi-channel low-impedance loudspeaker installations.

Included Accessories:

The amplifier uses removable Euroblock input and output connectors. Confirm the exact number of supplied connectors and the regional power-cable configuration with the distributor.

Accessories (Not Included):

• Passive loudspeakers.

• Audio signal cables and speaker wiring.

• Equipment rack and rack hardware.

• Remote volume controllers.

• External DSP processors, if required by the installation.

• Additional control wiring and installation accessories.

Weight:

• Unit Weight: 8.39 kg (18.5 lb)

Size:

• Rack Width: 19 in (482.6 mm)

• Rack Height: 2U

Electrical/Thermal:

• Amplifier Technology: High-efficiency Class D.

• Power Sharing: Intelligent power allocation across four channels.

• Cooling: SailFlow™ directed fan-cooling system.

• High-Pass Filter: Switchable 80 Hz per channel.

• Protection: Integrated amplifier protection and status monitoring.

• Thermal Dissipation: Varies by operating mode and load; consult the manufacturer's operating manual for detailed figures.