FA125.4 4-Channel Power Amplifier

The Ashly FA125.4 is a compact, four-channel Class D power amplifier designed for professional commercial audio installations. Delivering 125 watts per channel, it supports low-impedance loudspeakers and 70V or 100V distributed audio systems. Its power-sharing technology allows up to 250 watts to be allocated across each channel pair, providing additional flexibility for systems with different power requirements. The half-rack-width design makes it suitable for installations where space is limited.

From The Manufacturer:

Ashly's FA Series is designed to provide efficient, high-quality amplification in a compact format. The FA125.4 combines four amplifier channels with selectable low-impedance or high-impedance operation, enabling use with conventional loudspeakers and 70V/100V distributed audio systems.

The amplifier includes power-sharing capability, installer-friendly Euroblock connections, adaptive fan cooling, selectable input sensitivity, and built-in protection. Its compact enclosure is designed for placement under conference tables, behind displays, inside kiosks, and in other space-constrained installations.

Key Features:

• Four-channel Class D power amplifier.

• 125 watts per channel with all channels driven at rated load.

• Power sharing of up to 250 watts per channel pair.

• Supports 4Ω, 8Ω, and 16Ω low-impedance loudspeaker loads.

• Supports 70V and 100V constant-voltage systems.

• Compact half-rack-width, 1U-height construction.

• Efficient switching power supply with active power factor correction.

• Adaptive fan cooling.

• Selectable input sensitivity of -10dBV or +4dBu.

• Built-in 80Hz high-pass filter for high-impedance operation.

• Integrated clip limiter.

• Front-panel level controls and status indicators.

• Front-panel power switch with lockout capability.

• Remote GPIO for level control, standby, and fault status.

• USB-C port for firmware updates.

• Automatic sleep and wake functionality.

• Integrated protection against overheating, output DC, and excessive output power.

Specifications:

• Brand: Ashly.

• Model: FA125.4.

• Product type: Professional power amplifier.

• Amplifier class: Class D.

• Number of channels: 4.

• Output power at 4Ω: 125W per channel.

• Output power at 8Ω: 125W per channel.

• Output power at 16Ω: 125W per channel.

• Output power at 70V: 125W per channel.

• Output power at 100V: 125W per channel.

• Power sharing: Up to 250W per channel pair under supported operating conditions.

• 2Ω operation: Not recommended.

• Frequency response: 20Hz–20kHz, ±0.05dB.

• Signal-to-noise ratio: Greater than 102dB, unweighted.

• THD+N: Less than 0.5%.

• Damping factor: Greater than 250 at 8Ω below 1kHz.

• Crosstalk: Less than -65dB.

• Input sensitivity: Selectable -10dBV (0.316Vrms) or +4dBu (1.228Vrms).

• Input connectors: Removable six-pole balanced Euroblock connectors, one per channel pair.

• Speaker output connectors: Removable two-pole Euroblock connectors, one per channel.

• Remote connections: Euroblock GPIO for DC level control, standby, and fault output.

• Firmware interface: USB-C.

• Power supply: Universal switching power supply with active power factor correction.

• AC input: 100–240V AC, 50–60Hz.

• Cooling: Adaptive fan cooling with side-to-rear airflow.

• Compliance: UL, Energy Star, CE, FCC Class B, and RoHS.

Included Accessories:

• AC power cable, subject to regional packaging.

• Other supplied accessories should be confirmed with the distributor.

Applications:

• Conference rooms and boardrooms.

• Corporate offices and meeting spaces.

• Hotels and hospitality venues.

• Restaurants and bars.

• Retail stores and shopping centres.

• Houses of worship and church sound systems.

• Educational facilities and lecture rooms.

• Trade-show exhibits and exhibition stands.

• Digital displays and kiosks.

• Reception areas and hotel lobbies.

• Background music systems.

• Distributed audio installations using compatible 70V or 100V loudspeakers.

Included Accessories:

• AC power cable, subject to the supplied regional package.

• Additional accessories: Confirm with the supplier.

Accessories (Not Included):

• Rackmount kit.

• Rear rack-support hardware.

• Wall or surface-mounting bracket.

• Loudspeakers.

• Audio signal cables.

• Loudspeaker cables.

• Remote level controllers.

• External audio processing equipment, if required.

• Additional installation hardware.

Size:

• Width: 220mm (8.66 inches).

• Height: 43.7mm (1.72 inches).

• Depth: 338mm (13.3 inches).

• Form factor: Half-rack width, 1U height.

• Optional mounting hardware is available for supported installation configurations.

Weight:

• Net weight: 2.43kg (5.36lb).

• Shipping weight: 3.24kg (7.14lb).

Electrical/Thermal:

• AC input: 100–240V AC, 50–60Hz.

• Minimum startup voltage: 85V AC at 120V nominal; 170V AC at 240V nominal.

• Sleep-mode power consumption: Less than 0.5W.

• Idle power consumption in low-impedance mode: Approximately 15W.

• Idle power consumption in high-impedance mode: Approximately 25W.

• Power consumption at one-eighth rated output into 4Ω: Approximately 104W.

• Power consumption at one-eighth rated output into 8Ω: Approximately 96W.

• Power consumption at one-eighth rated output into 70V loads: Approximately 101W.

• Power consumption at one-eighth rated output into 100V loads: Approximately 96W.

• Thermal dissipation at one-eighth rated output into 4Ω loads: Approximately 144BTU/hour.

• Cooling: Adaptive fan cooling.

• Protection: Over-temperature, output DC, output over-power, AC mains voltage, and mains fuse protection.

• Operating temperature: 0°C–40°C, non-condensing.

• Energy-saving features: Automatic sleep and wake functionality.