ASHLY MA250.4 Four-Channel Multi-Mode Power Amplifier, 4 x 250W

Product Overview

The Ashly MA250.4 is a four-channel multi-mode power amplifier delivering 250W per channel at 2, 4, and 8 ohms and 70V/100V constant-voltage operation, providing a compact and cost-effective solution for four-zone commercial audio installations. Using the same D-MAX Class D technology and Advanced Intelligent Power-Sharing as the rest of the MA series, it delivers 1,000W total output with per-channel mode switching between low-impedance and constant-voltage loads. The MA250.4 suits commercial AV deployments in retail, hospitality, houses of worship, and similar environments where four independent audio zones are needed from a single 2RU rack-mount amplifier.

Product Description

The Ashly MA250.4 delivers four channels of 250W amplification in a 2RU 19-inch rack-mount chassis, each channel independently switchable between low-impedance (2, 4, or 8 ohm) and constant-voltage (25V, 70V, or 100V) operation. This per-channel flexibility allows a single MA250.4 to serve a mixed installation with low-Z foreground speakers in one zone and 70V ceiling speakers in others, without additional hardware. Ashly's D-MAX Class D technology keeps efficiency high and heat generation low, while the SailFlow Directed fan cooling system manages chassis temperature under continuous commercial use. Advanced Intelligent Power-Sharing dynamically distributes the total power budget across all four channels, maintaining consistent output as zone demand varies throughout the day. Input and output wiring uses removable Euroblock connectors, simplifying installation and future service in professional rack environments. Each channel includes a switchable 80Hz HPF and clip limiter for speaker protection. Remote volume control ports support wall-panel VC integration, and a Remote Standby port with selectable polarity allows external control from building automation systems. Channel pairs can be bridged for higher single-zone output where needed. Front-panel volume knobs and Power Standby switch are lockable via a rear-panel security switch. Comprehensive LED indicators cover signal, peak/mute, temperature, protect, power, current, bridging, and power-sharing modes. Dual voltage input (120V/230V AC) supports international installations, and a 5-year Ashly limited warranty covers the unit for professional commercial use.

Key Features

• 4 x 250W Multi-Mode Output — Each channel delivers 250W at 2, 4, or 8 ohms and at 70V/100V/25V constant-voltage, serving all standard commercial speaker load types.
• Per-Channel Impedance Switching — Each channel independently selects Low Z or Hi Z (25V/70V/100V) for mixed-system zone installations on a single amplifier.
• D-MAX Class D Technology — Ashly's proprietary amplifier design delivers high efficiency and reduced thermal output versus conventional amplifiers.
• Advanced Intelligent Power-Sharing — Dynamically allocates available power across all four channels under varying load conditions.
• Channel Bridging — Adjacent channel pairs can be bridged for increased single-zone output where needed.
• SailFlow Directed Fan Cooling — Directed active cooling manages chassis temperature under sustained commercial installation use.
• Removable Euroblock Connectors — Input and output Euroblock terminals simplify wiring and future service.
• 80Hz HPF and Clip Limiter Per Channel — Switchable speaker protection guards against low-frequency overload and amplifier clipping.
• Remote Standby and VC Ports — Remote Standby with selectable polarity and per-channel VC ports for control system integration.
• Front-Panel Security Lock — Rear-panel switch locks front-panel volume and standby controls against unauthorized adjustment.
• Dual-Voltage Operation — Accepts 120V AC or 230V AC for domestic and international deployment.
• 5-Year Limited Warranty — Ashly Audio's standard warranty for professional commercial installation products.

Typical Applications

• Multi-zone retail store background music and paging
• Restaurant and bar multi-area audio distribution
• House of worship overflow, lobby, and classroom zones
• Hotel and hospitality corridor and common area audio
• Corporate office and conference room zone audio
• School and educational facility multi-room audio systems
• Commercial meeting space and training room audio

Technical Specifications

Frequently Asked Questions

How does the MA250.4 differ from the MA500.4?

Both models provide four channels in 2RU. The MA250.4 delivers 250W per channel (1,000W total) and the MA500.4 delivers 500W per channel (2,000W total). The MA250.4 is the right choice when moderate per-zone power is sufficient and cost efficiency matters.

Can the MA250.4 be used with 70V constant-voltage distributed speaker systems?

Yes. All four channels support 70V and 100V constant-voltage operation at full 250W per channel, making the MA250.4 compatible with 70V transformer-tapped ceiling speaker systems.

Does the MA250.4 support channel bridging?

Yes. Adjacent channel pairs can be bridged on the MA250.4 to combine two channels for higher output into a single zone where more power is required.

Can front-panel controls be locked in installed environments?

Yes. A rear-panel security switch locks the front-panel volume knobs and Power Standby button, preventing unauthorized adjustment in attended commercial spaces.

Does the MA250.4 include DSP or network connectivity?

No. The MA250.4 is a pure power amplifier without onboard DSP or network connectivity. Ashly DSP processors such as the AQZ32 or FX series can be deployed upstream to add digital signal processing.