ASHLY SRA-4075 Convection-Cooled 1U Power Amplifier 4x5W 4 Ohms/40W 8 Ohms

Product Overview

The Ashly SRA-4075 is a 4-channel convection-cooled fanless rack-mount commercial installation amplifier delivering 75W per channel at 4 ohms and 40W per channel at 8 ohms in a single 1U chassis. As the lower-power 4-channel model in the Ashly SRA fanless commercial installation amplifier series, the SRA-4075 is designed for permanent commercial AV installations requiring four zones of clean, low-maintenance amplification without fan noise in quiet environments including boardrooms, conference rooms, courtrooms, and government facilities.

Product Description

The Ashly SRA-4075 convection-cooled rack-mount amplifier uses Class-D amplifier circuitry and a switch-mode power supply for energy-efficient operation in a compact 1U chassis weighing approximately 10 lbs. The fanless design means no ongoing maintenance after installation and no fan hum in spaces where the amplifier is audible. Four independent channels each provide 75W at 4 ohms or 40W at 8 ohms, with each channel pair bridgeable to 150W at 8 ohms for additional headroom on specific zones. Front-panel level attenuators and signal present/clip alert LEDs provide per-channel monitoring and control. Rear-panel controls include a gain switch (+36 dB or +26 dB input sensitivity), an 80 Hz high-pass filter (on/off) per channel, and Euroblock connectors on both inputs and outputs for 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 connected speakers during power-up sequences. Extensive protection circuitry covers output overcurrent, DC output faults, supply overvoltage, in-rush limiting, and mains fuse protection. The SRA-4075 carries TUV, CE, FCC, and RoHS certifications and a 5-year warranty.

Key Features

• Convection Cooling (Fanless) — No fan noise in permanently installed quiet environments: boardrooms, courtrooms, and conference rooms.
• 4 Channels, 1U Rack Space — High channel density in a compact single rack unit weighing approximately 10 lbs.
• 75W Per Channel at 4 Ohms — Full rated output with all four channels driven simultaneously.
• 40W Per Channel at 8 Ohms — Operates into both 4-ohm and 8-ohm speaker loads.
• 150W Bridged Mono at 8 Ohms — Channel pairs can be bridged for additional single-zone headroom.
• Class-D with Switch-Mode Power Supply — Energy-efficient design for always-on commercial installations.
• 80 Hz High-Pass Filter — Switchable per channel to protect distributed speakers.
• Remote Power Turn-On/Off — Centralized power management from room control systems.
• Adjustable Turn-On Delay — Up to 7.5 seconds to protect speakers during power-up.
• Euroblock I/O Connectors — Standard commercial installation wiring on 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

Technical Specifications

Frequently Asked Questions

Is the SRA-4075 completely fanless?

Yes. The SRA-4075 is fully convection-cooled with no fans, making it appropriate for noise-sensitive permanent installations in occupied spaces such as boardrooms, courtrooms, and conference rooms.

How does the SRA-4075 compare to the SRA-4150?

Both are 4-channel, 1U convection-cooled amplifiers with the same feature set and form factor. The SRA-4075 delivers 75W per channel at 4 ohms; the SRA-4150 delivers 150W per channel. The SRA-4150 also supports 25V constant-voltage output on its 4-ohm output; the SRA-4075 does not.

What connector type does the SRA-4075 use?

The SRA-4075 uses Euroblock connectors for both inputs and outputs, which is standard for commercial AV installation wiring.

Can zones be bridged on the SRA-4075?

Yes. Channel pairs can be bridged to deliver 150W into an 8-ohm load per pair, providing two bridged mono outputs from the four-channel amplifier.