The Grommes~Precision AX250G is a 250-watt commercial power amplifier designed for distributed sound systems, telephone paging, and background music installations. Part of the AXIOM-G Series, this American-made amplifier combines continuous-duty performance, flexible speaker outputs, and automatic paging priority in a rugged 2U rack-mount chassis.
Delivering 250 watts of continuous RMS power, the AX250G is well suited for commercial facilities requiring greater amplifier capacity than smaller 60W or 125W systems. Its 4–8 ohm, 25V, and 70.7V outputs accommodate conventional loudspeakers and distributed commercial speaker systems.
With a dedicated telephone paging input and automatic music muting, the AX250G provides a practical solution for installations where background music and voice announcements share the same sound system.
250 Watts of Continuous RMS Power
The AX250G delivers 250 watts of continuous RMS output for commercial and industrial sound installations.
Its heavy-duty power supply is engineered for consistent operation in systems that run for extended periods, making it suitable for warehouses, retail facilities, schools, and larger commercial buildings.
For 70V distributed speaker installations, the additional amplifier capacity supports more connected speakers or higher transformer tap settings, provided the total speaker load remains within the amplifier's rated capacity with appropriate headroom.
Flexible 4–8 Ohm, 25V, and 70.7V Speaker Outputs
The AX250G supports conventional low-impedance speakers as well as transformer-isolated 25V and 70.7V distributed speaker lines.
The built-in output transformer eliminates the need for an external line-matching transformer when connecting compatible commercial ceiling speakers, wall-mounted speakers, or paging horns.
This flexibility allows installers to use the AX250G in a variety of commercial sound applications, from centralized paging systems to distributed background music installations.
Telephone Paging with Automatic Music Muting
The AX250G features an independent balanced 600-ohm telephone paging input with a tamper-resistant gain adjustment.
Its voice-activated muting circuit automatically reduces the auxiliary music signal when a paging announcement is detected, helping ensure that important announcements remain clearly audible.
The automatic muting function is defeatable, allowing installers to configure the amplifier for applications that do not require paging priority.
Auxiliary Inputs for Background Music
Two parallel auxiliary inputs accommodate a compatible line-level background music source.
The AX250G uses a 1.5-channel mixing configuration that combines the auxiliary music path with an independent telephone paging input.
This straightforward arrangement provides the essential functionality for music and paging systems without requiring a separate multichannel mixer.
Built-In Protection for Reliable Operation
The AX250G incorporates multiple protection circuits designed to help safeguard the amplifier during demanding commercial installations.
These include short-circuit protection, peak overload protection, current limiting, thermal protection, an AC circuit breaker, and an output relay designed to minimize unwanted speaker noise during startup.
Its heavy-duty power supply and fanless convection cooling support continuous operation while eliminating cooling fan noise and routine fan maintenance.
Compact 2U Rack-Mount Design
Despite its 250-watt output capability, the AX250G occupies only two rack spaces in a standard 19-inch equipment rack.
Its convection-cooled construction makes it suitable for commercial equipment racks where fan noise is undesirable. Proper ventilation should be maintained according to the manufacturer's installation guidelines.
Designed and manufactured in the USA, the AX250G combines industrial-grade construction with the straightforward operation required for commercial sound systems.
Key Features
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250 watts continuous RMS output power
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Supports 4–8 ohm, 25V, and 70.7V speaker systems
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Built-in isolated transformer for distributed speaker lines
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Independent balanced 600-ohm telephone paging input
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Automatic voice-activated auxiliary muting, defeatable
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Two parallel auxiliary inputs for background music
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1.5-channel mixing configuration
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Heavy-duty power supply for continuous-duty operation
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Short-circuit, overload, current-limiting, and thermal protection
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Output relay helps minimize startup speaker noise
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Fanless convection-cooled 2U rack-mount chassis
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Designed and manufactured in the USA
Technical Specifications
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Specification
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Details
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Manufacturer
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Grommes~Precision
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Model
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AX250G
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Product Series
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AXIOM-G
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Amplifier Type
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Commercial power / paging amplifier
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Output Power
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250W continuous RMS
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Mixing Channels
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1.5
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Speaker Outputs
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4–8 ohms, 25V, 70.7V
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Output Transformer
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Built-in, isolated 25V and 70.7V
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Auxiliary Inputs
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2, connected in parallel
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Paging Input
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Balanced 600-ohm Tel-Page
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Paging Priority
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Voice-activated auxiliary muting, defeatable
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Input Sensitivity / Impedance, Tel-Page
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50 mV / 600 ohms
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Input Sensitivity / Impedance, 600-ohm Line
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0.50V / 600 ohms
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Input Sensitivity / Impedance, High-Z
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0.50V / 10 kΩ
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Total Harmonic Distortion
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Less than 0.1% at rated output (AXIOM-G series sheet)
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Frequency Response, Direct
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20 Hz–20 kHz, ±1 dB
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Frequency Response, 25V/70.7V
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50 Hz–15 kHz, ±1 dB
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Hum and Noise
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90 dB below rated output (AX250 instruction sheet)
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Cooling
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Convection
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Rack Height
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2U
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Dimensions (W × H × D)
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19 × 3.5 × 11 inches
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Net Weight
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20 lb
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Country of Manufacture
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USA
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Recommended Applications
The Grommes~Precision AX250G is an excellent choice for commercial installations requiring higher amplifier output capacity, including:
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Warehouses and industrial facilities
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Retail stores and shopping centers
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Schools and educational buildings
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Office buildings and corporate facilities
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Restaurants and hospitality venues
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Commercial background music systems
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Distributed 25V and 70.7V speaker installations
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Telephone paging and announcement systems
Why Buy the Grommes~Precision AX250G from Audio Supply?
Audio Supply specializes in professional and commercial audio equipment for business, institutional, and installed sound applications.
Whether you're expanding a distributed speaker system or upgrading an existing paging amplifier, Audio Supply can help you select compatible equipment and determine the appropriate amplifier capacity for your installation.
The Grommes~Precision AX250G provides a dependable, American-made amplification solution for commercial sound systems requiring 250 watts of continuous RMS power, flexible speaker connections, and integrated paging priority.
Need a Lower-Power Commercial Amplifier?
For smaller commercial sound installations, Audio Supply also offers the following Grommes~Precision AXIOM-G Series amplifiers:
Selecting the appropriate amplifier depends on the total connected speaker load, transformer tap settings, and desired system headroom.
