ASHLY FX125.4 1/2-Rack Compact 4-Chan Power Amp with DSP, 4 x 125W at 4/8 Ohms, 2 x 250W at 70V

Product Overview

The Ashly FX125.4 is a four-channel Class D power amplifier with fully integrated DSP, delivering 125W per channel at 4 or 8 ohms in a half-rack chassis with built-in Wi-Fi and Ethernet connectivity. The Protea DSP engine handles 4 inputs by 4 outputs with comprehensive signal processing on every stage, making the FX125.4 a true single-box solution for commercial audio installation zones requiring amplification, mixing, EQ, routing, crossover, and speaker management in one compact unit. Its half-rack form factor fits into tight non-rack spaces as well as standard rack installations with optional brackets.

Product Description

The FX125.4 provides 125W per channel across four independent channels at 4 or 8 ohms, with Advanced Dynamic Power Sharing allowing up to 250W on a single channel when the adjacent channel is unloaded or lightly loaded. Two channel pairs can each operate at 70V or 100V in bridge mode, enabling mixed low-impedance and constant-voltage distributed speaker zone configurations within the same chassis. Balanced mic/line inputs on removable Euroblock connectors accept signal directly from microphones or line-level sources on all four inputs, eliminating the need for external input transformers or preamps. Unbalanced RCA inputs are additionally provided for program and streaming source connections.

The Protea DSP engine processes 4 inputs through 4 outputs with separate processing layers for inputs, zones, outputs, and speaker presets. Zone processing includes source selection, mono/stereo operation, level control, and a compressor on zones A through D. Output processing provides up to 100ms of delay per output, 10 fully parametric EQ bands, crossover, polarity, and a three-mode limiter (clip, peak, and RMS). Speaker presets can be created, saved, and loaded per output channel, accommodating different loudspeakers on different zones, or satellite-plus-subwoofer configurations within the same system. FIR filter imports allow advanced speaker optimization for demanding applications.

The browser-based software interface requires no application installation and works from any PC, tablet, or smartphone on any operating system. FX125.4 includes a built-in Wi-Fi access point for direct wireless connection from a configuring device, with no network router or additional hardware required. Ethernet provides wired LAN connection for permanent installed-system networking and remote access. Addressable GPIO ports, standby/mute ports, and per-channel assignable VC remote ports allow integration with wall remotes, control systems, and building automation. SPDIF digital I/O enables connection to compatible digital audio equipment and digital bridging of two FX units for expanded system configurations. A 5-year Ashly warranty is included.

Key Features

• 4 x 125W Class D Output (4/8 ohms) — Four independent channels at 125W per channel; up to 250W per channel via Dynamic Power Sharing.
• 70V/100V Bridge Mode — Two channel pairs operable at 70V or 100V constant voltage for distributed speaker systems.
• 4-Input x 4-Output Protea DSP Engine — Complete signal processing on all inputs, zones, outputs, and speaker presets in one box.
• 10-Band Parametric EQ Per Output — Fully parametric 10-band EQ with crossover, polarity, delay, and limiter per output channel.
• Speaker Preset System — Custom speaker presets (with FIR filter support) saveable and loadable per output, supporting multiple speaker types in one system.
• Built-in Wi-Fi Access Point — Direct wireless connection for browser-based configuration from any device without a network router.
• Ethernet Networking — Wired LAN for permanent installation, remote access, and multi-unit system management.
• Balanced Euroblock + RCA Inputs — Mic/line balanced inputs on all four inputs, plus RCA for program sources.
• SPDIF Digital I/O — Connects to compatible digital equipment; enables digital bridging to expand system output count.
• Addressable GPIO, VC, Standby/Mute Ports — Integration with wall remotes, control systems, and building automation.
• Half-Rack Form Factor — Fits in tight non-rack installations; optional rack-mount and wall/surface-mount brackets available.
• Dynamic Power Sharing — Automatically redistributes power between channels to accommodate mismatched loads (e.g., 175W/75W or 250W/0W per channel pair).
• Auto/Manual Power Saver Mode — Adjustable sleep/standby for energy efficiency in commercial installations.
• 5-Year Ashly Warranty — Full coverage on all parts and labor.

Typical Applications

• Conference room and huddle room ceiling speaker amplification
• Retail store and restaurant multi-zone background music amplification
• Hotel lobby and hospitality area sound system amplification
• Classroom and educational facility distributed audio
• Kiosk, display, and exhibit amplification requiring compact form factor
• House of worship fill speaker and lobby zone amplification
• Bar and restaurant multi-zone entertainment audio

Technical Specifications

Frequently Asked Questions

What is Dynamic Power Sharing on the FX125.4?

Dynamic Power Sharing automatically distributes the available power budget between channels within each channel pair. If one channel is unloaded or lightly loaded, its unused power headroom shifts to the adjacent channel, allowing up to 250W from a single channel. This is particularly useful for asymmetric speaker loads or when running a subwoofer on one channel and satellite speakers on another.

Can the FX125.4 drive 70V distributed speaker systems?

Yes. Each pair of channels can be bridged to operate at 70V or 100V constant voltage, delivering up to 250W per bridged pair. This allows the FX125.4 to serve both low-impedance and constant-voltage speaker zones simultaneously.

Does the FX125.4 require software installation for configuration?

No. The FX125.4 has a built-in browser-based interface. Configuration is handled entirely through a web browser with no software to install. The built-in Wi-Fi access point allows direct wireless connection from any PC, tablet, or smartphone.

Can speaker presets be saved and reused on different output channels?

Yes. The FX125.4 supports a speaker preset library with per-output loading, allowing different speaker models to be configured independently on each output channel. FIR filter files from supported speaker manufacturers can be imported for advanced optimization.

What is the FX125.4's form factor and how is it mounted?

The FX125.4 is a half-rack (1/2 RU) unit that can operate free-standing in non-rack installations. Optional factory accessory kits include a rack-mount bracket for standard 19-inch racks and a wall/surface-mount bracket for installation behind displays, inside casework, or in AV furniture.