RTI Control AMP-4-125 4 Channel DSP Matrix Amplifier – 125W / 70V-100V Commercial Audio Amplifier

The RTI AMP-4-125 DSP Matrix Amplifier is a compact high-performance commercial audio amplifier engineered for professional hospitality, retail, and multi-zone AV installations requiring both low-impedance and high-impedance audio distribution.

Featuring advanced DSP processing, configurable matrix routing, and ultra-efficient Cool Power® Class D amplification, the AMP-4-125 delivers exceptional audio performance for both 4Ω–16Ω loudspeaker systems and 70V/100V distributed speaker networks.

Its compact half-rack 1U design makes it ideal for space-conscious commercial AV projects while still providing powerful multi-zone audio flexibility and advanced system integration capabilities.

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Professional Multi-Zone Commercial Audio

The RTI AMP-4-125 is designed for commercial and hospitality environments that require flexible zone control, reliable performance, and high-quality sound distribution.

Ideal applications include:

• Hotels and hospitality venues
• Restaurants and cafés
• Retail environments
• Commercial offices
• Conference and meeting rooms
• Background music systems
• Paging and announcement systems
• Multi-zone commercial AV installations

Its flexible matrix architecture allows effortless routing of multiple audio sources to independent listening zones.

Flexible Low-Z & 70V/100V Audio Support

The AMP-4-125 supports both low-impedance and high-impedance speaker systems, making it highly versatile for professional installations.

Supported Configurations

• Two stereo low-impedance zones
• Four mono low-impedance channels
• Two 70V/100V mono zones
• Mixed low-Z and high-Z configurations

Multiple amplifiers can also be daisy-chained to expand system coverage and zone capacity.

Powerful Class D Amplification

Powered by advanced Cool Power® Class D amplifier technology, the AMP-4-125 delivers robust audio performance with low heat generation and excellent energy efficiency.

Amplifier Output

• 125W per channel @ 4Ω / 8Ω
• 250W per channel @ 70V / 100V
• High-efficiency thermal performance
• Reliable continuous commercial operation

Its high-power output ensures clear, dynamic sound reproduction across demanding commercial environments.

Advanced DSP Audio Optimisation

The integrated DSP engine enables professional-level tuning and acoustic optimisation for every installation.

DSP Features Include

• Multi-zone setup
• Input mixing
• Priority and auto-ducking
• Input and output EQ
• High-pass filtering
• Speaker presets
• Delay configuration
• Volume restrictions
• S/PDIF routing
• Wall-S1 controller integration
• Sine wave generation

Configuration is managed through the intuitive RTI web GUI for simplified browser-based setup.

Easy Integration & Control

The AMP-4-125 supports flexible integration with RTI automation platforms and third-party commercial AV systems.

Control Options

• IP control via RJ45
• GPIO control support
• RTI automation integration
• Third-party control compatibility
• LAN and Wi-Fi configuration access

GPIO controls support:

• Volume adjustment
• Mute functionality
• Trigger activation
• Standby control

Key Features

• 4-channel DSP matrix amplifier
• 125W per channel low-Z output
• 250W per channel 70V/100V output
• Compact half-rack 1U design
• Class D Cool Power® amplification
• Built-in DSP audio processing
• Configurable matrix routing
• Analog and digital source compatibility
• Daisy-chain expansion support
• Browser-based configuration interface
• IP and GPIO control options
• Rack mount or free-standing installation

Technical Specifications

Audio Inputs

Analog Inputs

• 4 RCA unbalanced stereo inputs
• 4 Phoenix balanced stereo inputs

Digital Inputs

• 1 Coaxial S/PDIF input

Audio Outputs

Output Configurations

• 2 stereo low-Z zones
• 4 mono low-Z channels
• 2 high-Z mono zones
• Mixed output configurations supported

Amplifier Specifications

Amplifier Type

• Class D Cool Power®

Output Power

Low Impedance Output

• 4 x 125W @ 4Ω / 8Ω

High Impedance Output

• 2 x 250W @ 70V / 100V

Power Sharing

• Up to 2 x 250W across each channel pair

Output Voltage

• 45 Vrms (Low-Z)
• 70V / 100V (High-Z)

Audio Performance

Signal-to-Noise Ratio

• 106dB A-weighted

• 20Hz–20kHz, 8Ω load

THD+N

• <0.05%
• 20Hz–20kHz
• 3dB below rated power

Frequency Response

• 20Hz–20kHz ±0.5dB
• 8Ω load

Protection Circuits

The AMP-4-125 includes advanced protection systems for reliable long-term commercial operation.

Protection Features

• Short circuit protection
• DC protection
• Undervoltage protection
• Temperature protection
• Overload protection

Control & Connectivity

RTI & Third-Party Control

• IP (RJ45)
• GPIO (Phoenix connector)

Power Specifications

Power Supply

• UREC™ universal switch mode power supply
• Power Factor Correction (PFC)
• Standby converter

AC Input Voltage

• 100–240V~
• 50/60Hz

Power Consumption

• 150W

Standby Consumption

• <0.5W

Physical Specifications

Dimensions (W x D x H)

• 12.6” x 8.66” x 1.75”
• 320mm x 220mm x 44.5mm

Rack Size

• 1U half-rack design

Weight

• 6.2 lb (2.8kg)

Installation Options

• Rack mount installation
• Free-standing placement
• Rack-mount kit included
• Adhesive rubber feet included

Environmental Specifications

Operating Temperature

• +32°F to +104°F
• 0°C to +40°C

Warranty

• Three-Year Manufacturer Warranty (Parts & Labour)

Included in the Box

The RTI AMP-4-125 package includes:

• AMP-4-125 DSP Matrix Amplifier
• Power cord
• 6-pin Phoenix input connectors (2)
• 4-pin Phoenix output connectors (2)
• 8-pin Phoenix GPIO socket connector
• Adhesive rubber feet
• Rack-mount kit

Why Choose the RTI AMP-4-125?

Flexible Commercial Audio Deployment

Supports both low-impedance and 70V/100V speaker systems within a compact amplifier platform.

Compact Professional Design

Half-rack 1U chassis is ideal for installations where rack space is limited.

Advanced DSP Processing

Comprehensive DSP tools provide detailed acoustic tuning and system optimisation.

Efficient High-Power Performance

Cool Power® Class D amplification delivers reliable audio performance with low heat output.

Scalable Multi-Zone Audio

Daisy-chain support allows system expansion for larger commercial audio projects.

Ideal Applications

The RTI AMP-4-125 is perfect for:

• Hospitality venues
• Retail environments
• Restaurants and cafés
• Conference rooms
• Commercial offices
• Distributed background music systems
• Paging systems
• Professional AV installations

Request Trade Pricing

For professional installation support, trade pricing, or commercial audio project enquiries:

REQUEST TRADE QUOTE