RTI-AMP-4-125D - 4 Channel 125W 8Ω, 2 Channel 70/100V 250W DSP Matrix Amplifier with Dante
- VendorRTI

RTI-AMP-4-125D - 4 Channel 125W 8Ω, 2 Channel 70/100V 250W DSP Matrix Amplifier with Dante
- VendorRTI

UMAC™ Class D Amplification
Delivers ultra-low distortion, full-bandwidth <0.05% THD+N and >106dB SNR. Professional audio quality at commercial scale, with high efficiency that reduces heat load and operating cost.
PowerShare Technology
Unused headroom from idle channels is redistributed to active channels in real time, maximizing amplifier utilization without upsizing the unit or adding hardware.
Browser-Based Control Web App
Installers configure inputs, zones, EQ, speaker presets, and GPIO via any web browser over Ethernet or Wi-Fi, no proprietary software, no dedicated laptop, no return trips.
Dual-Mode Lo-Z and Hi-Z Output
One unit drives both 4Ω/8Ω speakers and 70V/100V distributed systems, eliminating the need for external transformers or separate product SKUs across mixed-topology projects. 125W per channel Lo-Z (4Ω/8Ω) and Hi-Z (70V/100V) - no external transformer required.
Dante® / AES67 Networking
Dante-enabled variants integrate into existing professional IP audio networks with AES67 interoperability, enabling long-distance routing and daisy-chaining without dedicated audio cabling.
Per-Output Speaker Presets
FIR, parametric EQ, crossover, delay, limiter, polarity. Eliminates external speaker processors for most installs. Presets can be locked, exported, and shared across projects, reducing commissioning time and ensuring consistent tuning.
GPIO Interface
Physical volume, standby, mute, and 12V trigger. Enables wall-volume controls and building-automation integration without a full control system, expanding deployment options for budget-conscious commercial installations.
| Power | |
| Total System Power | 500 W |
| Output Power — Lo-Z (4Ω/8Ω) | 4 x 125 W (4Ω / 8Ω) |
| Output Power — Hi-Z (70V/100V) | 2 x 250 W (70V / 100V*) |
| PowerShare (up to) | 2 x 250 W (across Ch1-2 and Ch3-4) |
| Power Consumption (full load) | 150 W |
| Power Ratings | 1% THD @ 120 Vac and 230 Vac |
| Power Supply | UREC™ universal switch-mode PSU with PFC and standby converter |
| Operating Voltage / Frequency | Universal Mains — 100–240 VAC ~ 50/60 Hz |
| Standby Consumption | < 0.6 W |
| Audio | |
| Amplifier Class / Output Circuitry | UMAC™ Class D — full bandwidth PWM modulator with ultra-low distortion |
| Output Voltage | 70Vp / 140Vpp unloaded | Bridged: 140Vp / 280Vpp unloaded |
| Signal-to-Noise Ratio | > 106 dB (A-weighted, 20 Hz–20 kHz, 8Ω load) |
| THD+N (typical) | < 0.05% (20 Hz–20 kHz, 8Ω load, 3 dB below rated power) |
| Frequency Response | 20 Hz–20 kHz (+0 / −0.8 dB, 8Ω load, 3 dB below rated power) |
| Protection Circuits | Short Circuit, DC, Undervoltage, Temperature, Overload |
| Network Audio Protocol | Dante® / AES67 (Audinate®) |
| Dante® Audio Channels | Up to 4 in x 4 out audio channels over standard IP network |
| Ports | |
| Analog Input | 4x RCA (Unbalanced Stereo) 4x 6-pin Phoenix Connectors (Balanced Stereo) |
| Digital Input | 1x Coax |
| Digital Output | 1x Coax |
| Analog Output | 2x 4-pin Phoenix Connector |
| Dante® Audio | 1x RJ45 |
| Control | |
| IP | 1x RJ45 |
| GPIO | 1x 8-pin Phoenix Connector |
| Physical / Dimensions | |
| Dimensions (H × W × D) | mm: 44 x 220 x 319 inches: 1.7 x 8.7 x 12.6 |
| Weight | 2.8 kg (6.2 lbs) |
| Rack Format | ½ Rack, 1U |
| Operating Temperature | 0 – 40 °C (32 – 104 °F) |
| * 100V line mode is rated at –1 dB (≈ 90 V). ** PowerShare operates independently across Ch1-2 and Ch3-4. | |
| Specifications subject to change without notice. Mass & dimensions are approximate | |

Included in the box: