Audio System R-125.4

With the R-125.4, Audio System presents a high-performance 4-channel power amplifier from the popular RADION series. Built using Class A/B technology, this power amplifier impresses with its high sound quality, impressive power reserves, and extensive adjustment options for custom sound setups. Thanks to fully active operation, variable crossovers, and high-quality SMD technology, the R-125.4 is suitable for both demanding front-end systems and high-performance active or subwoofer applications. The sophisticated cooling design ensures reliable operation even under heavy loads. The amplifier was developed by Audio System Germany for audio enthusiasts who value dynamics, control, and musical precision.

Technical Specifications:

• 4-Channel Class A/B Hi-Fi Amplifier
• SMD Technology
• Power at 4 ohms: 4 × 125 watts RMS
• Power at 2 ohms: 4 × 220 watts RMS
• Bridged at 4 ohms: 2 × 440 watts RMS
• Full-active operation possible
• Variable and switchable high-pass, low-pass, and band-pass filters
• Built-in subsonic filter
• High-level and RCA inputs
• Automatic Power-On Function (Auto Turn-On)
• Adjustable Signal Detection
• FSA (Front Stage Adjuster) compatible
• RTC cable remote control available as an option
• Efficient multi-stage cooling system with actively controlled cooling
• Frequency response: 10 Hz – 60 kHz
• Total harmonic distortion: < 0.03%
• Signal-to-noise ratio: > 90 dB
• Input sensitivity: 0.3 – 10 volts
• Fuse: 3 × 25 A
• Dimensions (L × W × H): approx. 325 × 185 × 50 mm
  
  
  

Highlights:

• High-performance Class A/B technology for audiophile-quality sound
• Flexible active and multi-path systems are feasible
• Comprehensive filter section for precise sound tuning
• High-quality aluminum housing with optimized heat dissipation
• Ideal for front systems, rear systems, or subwoofer applications
• Developed and tuned by Audio System Germany