ASHLY SRA-4150 Power Amplifier 4 x 150W @ 4 Ohms

Product Overview

The Ashly SRA-4150 is a 4-channel convection-cooled rack-mount commercial installation amplifier delivering 150W per channel at 4 ohms and 80W per channel at 8 ohms in a single 1U chassis. As part of the Ashly SRA fanless commercial installation amplifier series, the SRA-4150 is designed for permanent commercial AV installations where fan noise is unacceptable and four channels of clean amplification are required. The 150W models in the SRA series also support 25V constant-voltage output directly from the 4-ohm output, making the SRA-4150 a practical choice for commercial paging and BGM in quiet environments including boardrooms, conference rooms, and government facilities.

Product Description

The Ashly SRA-4150 convection-cooled rack-mount commercial amplifier uses a switch-mode power supply and Class-D amplifier circuitry for high energy efficiency in a compact 1U chassis weighing approximately 10 lbs. With no fans, the SRA-4150 requires virtually no maintenance after installation and operates in complete silence—an essential characteristic for permanently installed amplifiers in occupied spaces where fan hum would be disruptive. Four independent channels each deliver 150W at 4 ohms or 80W at 8 ohms, with the ability to bridge pairs to 300W at 8 ohms for additional headroom on a specific zone. The 150W output rating also enables 25V constant-voltage line driving directly from the 4-ohm output. Each channel has front-panel level attenuators and signal present and clip alert LEDs. The 2-channel version (SRA-2150) adds a stereo headphone jack for monitor use. Rear-panel controls include a gain switch for +36 dB or +26 dB input sensitivity and an 80 Hz high-pass filter (on/off) per channel. Euroblock connectors on both inputs and outputs accommodate standard commercial installation wiring. Remote power turn-on/off and an adjustable turn-on delay (up to 7.5 seconds) allow integration with room control systems and protect speakers during power-up sequences. Extensive protection circuitry covers output overcurrent, DC output, supply overvoltage, in-rush limiting, and mains fuse. The SRA-4150 is certified to TUV, CE, FCC, and RoHS standards and carries a 5-year warranty.

Key Features

• Convection Cooling (Fanless) — No fan noise in permanently installed quiet environments: boardrooms, courtrooms, conference rooms, and government spaces.
• 4 Channels, 1U Rack Space — High channel density in a compact single rack-unit chassis weighing approximately 10 lbs.
• 150W Per Channel at 4 Ohms — Full-rated output with all four channels driven simultaneously.
• 80W Per Channel at 8 Ohms — Operates into 8-ohm speaker loads as well as 4-ohm.
• 300W Bridged Mono at 8 Ohms — Channel pairs can be bridged for additional single-zone headroom.
• 25V Constant Voltage Capable — The 150W 4-ohm output supports 25V constant-voltage line driving directly.
• Class-D with Switch-Mode Power Supply — Energy-efficient amplifier design for reduced operating costs in always-on installations.
• Front-Panel Level Attenuators and Status LEDs — Per-channel level control and signal present/clip alert indicators.
• 80 Hz High-Pass Filter — Switchable per channel to protect distributed speakers from low-frequency overload.
• Remote Power Turn-On/Off — Centralized power management from room control systems.
• Adjustable Turn-On Delay — Up to 7.5 seconds of delay to protect connected speakers during power-up.
• Euroblock I/O Connectors — Standard commercial installation wiring connectors on both inputs and outputs.
• 5-Year Warranty — Backed by Ashly’s commercial-grade amplifier warranty.

Typical Applications

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

Technical Specifications

Frequently Asked Questions

Is the SRA-4150 completely fanless?

Yes. The SRA-4150 is fully convection-cooled with no fans, producing no fan noise. This makes it appropriate for permanent installations in occupied spaces where fan hum would be objectionable, including boardrooms, courtrooms, and conference rooms.

Can the SRA-4150 drive 70V constant-voltage speaker systems?

No. The SRA-4150 supports 25V constant-voltage output only via the direct-coupled 4-ohm output on 150W models. For 70V or 100V transformer-isolated constant-voltage distribution, the TRA series (TRA-2150 or TRA-4150) is the appropriate Ashly product.

How many channels can be bridged on the SRA-4150?

The SRA-4150 supports bridged mono operation on channel pairs, delivering 300W into an 8-ohm load per pair. This gives two bridged outputs from the four-channel amplifier.

What input connector type does the SRA-4150 use?

The SRA-4150 uses Euroblock connectors for both inputs and outputs, which is standard for commercial AV installation wiring.

How does the remote power turn-on/off work?

The SRA-4150 includes a rear-panel remote power control connection that accepts a contact closure or trigger signal from a room control system, enabling the amplifier to be powered on and off from a centralized control point without front-panel access.