FA250.4 4-Channel Power Amplifier

The Ashly FA250.4 is a professional four-channel Class D power amplifier delivering 250 watts per channel in a compact 1U rackmount design. Supporting both low-impedance loudspeakers and 70V/100V distributed audio systems, it provides a versatile solution for commercial installations where reliable amplification and efficient use of rack space are essential. Its integrated protection features, automatic power-saving mode, installer-friendly Euroblock connections and remote-control capabilities make it suitable for a wide range of permanent audio installations.

From The Manufacturer:

The Ashly FA Series combines high-density Class D amplification with flexible installation options. The FA250.4 provides four channels of 250-watt amplification in a single rack unit, with selectable low-impedance and high-impedance operation. It includes adaptive fan cooling, front-panel level controls, channel-status indicators, remote GPIO functionality and automatic sleep/wake operation to support reliable, energy-conscious performance in professional audio systems.

Key Features:

• Four-channel Class D power amplifier.

• 250 watts per channel with all channels driven.

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

• Compatible with 70V and 100V distributed audio systems.

• Compact 1U, full-width rackmount design.

• Adaptive fan cooling.

• Front-panel channel-level controls and status indicators.

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

• Built-in 80Hz high-pass filter in high-impedance mode.

• Integrated clip limiter for output protection.

• Remote GPIO for standby control, fault indication and DC level control.

• Automatic sleep mode with wake-on-audio functionality.

• USB-C connection for firmware updates.

• Comprehensive amplifier protection against overheating, output DC, excessive output power and AC mains faults.

• Universal 100–240V AC power supply.

Specifications:

Amplifier

• Model: FA250.4

• Amplifier type: Class D

• Number of channels: 4

• Output power at 4Ω: 250W per channel

• Output power at 8Ω: 250W per channel

• Output power at 16Ω: 250W per channel

• Output power at 70V: 250W per channel

• Output power at 100V: 250W per channel

• 2Ω operation: Not recommended

• Power sharing: No

Audio Performance

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

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

• Total harmonic distortion plus noise: Less than 0.5%

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

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

• High-pass filter: 80Hz in high-impedance mode; non-defeatable

• Clip limiter: Yes, non-defeatable

Connections

• Inputs: Removable, balanced 6-pole Euroblock connectors, one per channel pair

• Outputs: Removable 2-pole Euroblock connectors, one per channel

• GPIO: Removable 6-pole Euroblock connector

• USB: USB-C for firmware updates

• AC power: IEC power connector

Controls and Indicators

• Individual front-panel channel-level controls.

• Multicolour channel-status indicators for signal, limiting, mute and protection.

• Front-panel power/standby control.

• Rear-panel configuration switches for output mode, 70V/100V operation, input sensitivity, standby polarity and front-panel lockout.

• Remote DC level control available per channel pair.

Power Supply

• Input voltage: 100–240V AC

• Frequency: 50–60Hz

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

• Sleep-mode power consumption: Less than 0.5W

• Idle power consumption, low-impedance mode: 25W

• Idle power consumption, high-impedance mode: 30W

Environmental and Compliance

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

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

Specifications are based on Ashly's published FA Series datasheet.

Included Accessories:

• Rackmount hardware supplied for the FA250.4.

• IEC power cable: Exact regional cable supplied should be confirmed with the seller.

• Other supplied accessories: Not independently verified.

Applications:

• Commercial background music systems.

• Hotels, restaurants and bars.

• Retail stores and shopping environments.

• Conference rooms and meeting facilities.

• Houses of worship.

• Corporate offices and reception areas.

• Educational facilities.

• Multi-zone distributed audio installations.

• 70V and 100V public-address systems.

• Permanent installations requiring four independently amplified speaker channels.

Included Accessories:

• Manufacturer-supplied rackmount kit.

• Power cable and additional package contents should be confirmed with the supplier before listing them as included.

Accessories (Not Included):

• External audio mixer or signal processor, if required.

• Compatible remote DC level controllers, such as the Ashly WR-1 or WR-1.1.

• Loudspeakers and loudspeaker cabling.

• Audio input cabling and installation wiring.

• External control system, where required.

• Additional rack accessories not supplied with the unit.

Size:

• Width: 440mm

• Height: 43.7mm

• Depth: 293mm

• Rack format: 1U, full-width 19-inch rackmount design.

Weight:

• Net weight: Approximately 3.58kg

• Shipping weight: Approximately 4.59kg

Dimensions and weights are converted from the manufacturer's published imperial measurements.

Electrical/Thermal:

• Power input: 100–240V AC, 50–60Hz.

• Sleep-mode consumption: Less than 0.5W.

• Idle consumption, low-impedance mode: 25W.

• Idle consumption, high-impedance mode: 30W.

• Power consumption at 1/8 output power: 196W at 4Ω, 186W at 8Ω, 191W at 70V and 181W at 100V.

• Thermal dissipation at idle, low-impedance mode: 86BTU/hour.

• Thermal dissipation at idle, high-impedance mode: 103BTU/hour.

• Thermal dissipation at 1/8 output power: 243BTU/hour at 4Ω, 209BTU/hour at 8Ω, 226BTU/hour at 70V and 191BTU/hour at 100V.

• Cooling: Adaptive fan cooling, with airflow from the sides towards the rear.

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

Power-consumption and thermal-dissipation figures are manufacturer-published measurements under the test conditions specified in the datasheet.