ASHLY FA125.4 1/2U Power Amplifier 4x125W/4-8 Ohms, 70/100V

Product Overview

The Ashly FA125.4 is a half-rack (1/2U) 4-channel Class D power amplifier delivering 125W per channel at 4 or 8 ohms, with full 70V and 100V constant-voltage capability on all four channels. Designed for concealed commercial AV installations where space is at a premium, the FA125.4 fits under conference tables, behind displays, inside kiosks, and in any location where a full-rack amplifier is impractical. Its silent active cooling system and Auto Sleep/Wake mode make it well-suited for occupied spaces including conference rooms, training rooms, and commercial meeting spaces.

Product Description

The Ashly FA compact half-rack power amplifier series packs substantial channel count and output power into a half-rack form factor that goes where standard amplifiers cannot. The FA125.4 provides four channels of 125W each, with dynamic power sharing between channel pairs: when one channel draws less than its maximum, the paired channel can draw up to 250W total per pair, giving the system more flexibility to handle uneven speaker loads. All four channels support switchable Low-Z (4 or 8 ohm) or Hi-Z (70V or 100V) operation, selectable per channel, allowing mixed speaker system designs within a single amplifier. Built-in DSP functions activate automatically in Hi-Z mode: an 80 Hz high-pass filter reduces excessive bass loading on distributed speakers, and a clip limiter prevents loud transients from overdriving the outputs. Front panel input level controls, channel status LEDs, and a power switch are present and can be disabled for security in installations where unauthorized adjustment is a concern. Remote GPIO connections support DC level control, standby triggering, and failure status monitoring. Switchable input sensitivity (-10 dBV / +4 dBu) accommodates both consumer and professional signal sources. Auto Sleep/Wake mode reduces power consumption and heat during idle periods. The FA125.4 is Energy Star compliant and certified to cTUVus, CE, FCC, and RoHS standards. Optional rack kit (FA1.2RM) mounts one or two half-rack FA units in a standard 1U rack space.

Key Features

• 4-Channel Half-Rack Form Factor — Fits under conference tables, behind displays, inside kiosks, and in any space-constrained commercial AV installation.
• 125W Per Channel at 4/8 Ohms — Rated at 125W per channel with all four channels driven simultaneously at 4 or 8 ohms.
• 70V and 100V Constant-Voltage Output — All four channels support 70V and 100V operation for commercial paging and distributed BGM systems.
• Dynamic Power Sharing — Channel pairs can share up to 250W total per pair, accommodating uneven speaker loads within the same amplifier.
• Silent Active Cooling System — Quiet fan operation designed for noise-sensitive spaces including occupied conference rooms and meeting areas.
• Auto Sleep/Wake Mode — Powers down after 30 minutes of no signal input; wakes instantly when signal resumes to reduce energy consumption.
• Built-in 80 Hz HPF and Clip Limiter (Hi-Z) — Automatic DSP protection activates in Hi-Z mode to protect distributed speakers from bass loading and transients.
• Front Panel Lockout — Power switch and level controls can be disabled to prevent unauthorized adjustment in commercial deployments.
• Remote GPIO — DC level control, standby input, and failure status output for integration with room control systems.
• Switchable Input Sensitivity — -10 dBV / +4 dBu selectable to match consumer and professional signal sources.
• USB Port for Firmware Updates — Future firmware updates can be applied in the field via the front-panel USB port.
• Optional Rack Mounting — FA1.2RM rack kit mounts one or two FA-125 half-rack units side-by-side in a standard 1U rack bay.

Typical Applications

• Conference room
• Boardroom
• Training room
• Commercial meeting space
• Multi-purpose room
• House of worship

Technical Specifications

Frequently Asked Questions

Does the FA125.4 support 70V and 100V distributed speaker systems?

Yes. All four channels support 70V and 100V constant-voltage operation, selectable per channel, making the FA125.4 suitable for commercial paging and background music (BGM) distribution.

Can the FA125.4 be rack-mounted?

Yes. The optional FA1.2RM rack mount kit allows one or two FA-125 half-rack units to be mounted side-by-side in a standard 1U rack bay.

What is dynamic power sharing on the FA125.4?

Channel pairs on the FA125.4 share a 250W total power budget per pair. If one channel requires less than 125W, the remaining headroom is available to the paired channel, accommodating uneven speaker loads within the same amplifier.

Is the FA125.4 quiet enough for use in occupied conference rooms?

Yes. The Silent Active Cooling System and Auto Sleep/Wake mode are designed specifically for noise-sensitive environments such as conference rooms, boardrooms, and training rooms.

Can the front panel controls be locked out?

Yes. The front panel power switch and level controls can be disabled to prevent unauthorized adjustment, which is important in installations where the amplifier is accessible to non-technical users.

How does the FA125.4 connect to room control systems?

The FA125.4 provides a Remote GPIO connection for DC level control, standby triggering, and failure status output, enabling integration with standard commercial room control systems.