ASHLY MA500.4 4-Channel Multi-Mode Power Amplifier, 4x500W at 2/4/8 Ohms and 70V/25V

Product Overview

The Ashly MA500.4 is a four-channel multi-mode power amplifier delivering 500W per channel at 2, 4, and 8 ohms and 70V/100V constant-voltage operation, offering the same per-channel power as the MA500.8 in a four-zone configuration. Each channel independently switches between low-impedance and constant-voltage modes, making this rack-mount amplifier well suited for commercial AV installations where high-power zone flexibility is required from a compact, single-amplifier solution. With 2,000W total output and Ashly's D-MAX Class D efficiency, the MA500.4 is designed for demanding commercial installations including auditoriums, houses of worship, and multi-zone performance venues.

Product Description

The Ashly MA500.4 puts 500W per channel across four independent zones into a single 2RU rack-mount chassis, each channel independently configurable for low-impedance (2, 4, or 8 ohm) or constant-voltage (25V, 70V, or 100V) speaker loads. This per-channel mode switching lets a single MA500.4 simultaneously drive low-Z main speakers in one zone and 70V distributed ceiling speakers in another, without requiring additional amplifiers. Ashly's D-MAX technology provides high-efficiency Class D performance with low heat output, and the SailFlow Directed fan cooling system manages thermal conditions under sustained high-output use. The Advanced Intelligent Power-Sharing system dynamically allocates available power across the four channels, ensuring consistent output when zones have varying demand. Input and output wiring uses removable Euroblock connectors for reliable, service-friendly installation in professional racks. A switchable 80Hz HPF and clip limiter on each channel protect speaker drivers from low-frequency overload and amplifier distortion. Channel pairs can be bridged where a zone requires higher single-channel output, effectively doubling power to critical areas such as main fills or subwoofer feeds. Front-panel volume knobs and a Power Standby switch provide local control, and both can be locked via a rear-panel security switch. Remote Standby with selectable polarity allows integration with building control or AV automation systems. Comprehensive LED indicators monitor signal, peak/mute, temperature, protect, power, current, bridging, and power-sharing status. Dual-voltage operation (120V AC / 230V AC) supports international commercial installation deployments.

Key Features

• 4 x 500W Multi-Mode Output — Each channel delivers 500W at 2, 4, or 8 ohms and at 70V/100V, with 300W at 25V, covering all standard commercial speaker load types.
• Per-Channel Impedance Switching — Each channel independently selects between Low Z and Hi Z (25V/70V/100V), enabling mixed-system zones on a single amplifier.
• D-MAX Class D Technology — Ashly's proprietary amplifier stage delivers high efficiency and reduced thermal output versus conventional linear amplifier designs.
• Advanced Intelligent Power-Sharing — Dynamically distributes the total power budget across all four channels for consistent output under varying load conditions.
• Channel Bridging — Adjacent channel pairs can be bridged for applications requiring maximum output from a single zone.
• SailFlow Directed Fan Cooling — Directed fan cooling manages chassis temperature under sustained high-output commercial installation use.
• Removable Euroblock Connectors — Input and output connections use removable Euroblock terminals for reliable wiring and future serviceability.
• 80Hz HPF and Clip Limiter Per Channel — Switchable speaker protection on each channel guards against low-frequency overload and amplifier clipping.
• Remote Standby Port — Selectable-polarity remote standby input integrates with external control and automation systems.
• Remote Volume Control Ports — Per-channel VC ports accommodate wall-panel or third-party control-system volume adjustment.
• Front-Panel Security Lock — Rear-panel switch prevents unauthorized adjustment of volume knobs and Power Standby.
• Dual-Voltage Operation — Accepts 120V AC and 230V AC for domestic and international commercial deployment.

Typical Applications

• House of worship main, overflow, and lobby audio zones
• School auditorium and performing arts center sound reinforcement
• Theater and multi-purpose room audio systems
• Commercial meeting space and boardroom audio
• Hotel ballroom and event space distributed audio
• Retail store high-power zone background music and paging
• Government and institutional facility audio systems
• Broadcast studio monitor and foldback feeds

Technical Specifications

Frequently Asked Questions

What is the difference between the MA500.4 and the MA500.8?

Both models deliver 500W per channel using identical D-MAX technology. The MA500.4 provides four channels (2,000W total) and the MA500.8 provides eight channels (4,000W total). Choose the MA500.4 when four independent zones are sufficient.

Can the MA500.4 be used for 70V distributed speaker systems?

Yes. All four channels support 70V and 100V constant-voltage operation at 500W per channel, making the MA500.4 fully compatible with 70V transformer-tapped distributed audio systems.

Does the MA500.4 support channel bridging?

Yes. Adjacent channel pairs can be bridged on the MA500.4, combining two channels for higher output where a single zone requires maximum power, such as a main fill or subwoofer application.

Is there a remote standby input on the MA500.4?

Yes. The MA500.4 includes a Remote Standby port with selectable polarity, allowing external control systems or building automation to manage amplifier power state.

Does the MA500.4 include DSP or network connectivity?

No. The MA500.4 is a pure power amplifier. DSP processing and network connectivity can be added upstream using Ashly products such as the AQZ32 or FX series amplifiers with built-in DSP.