Description
The RG4 MK4 is inspired by the legendary German RG-series power amplifier, but this is far more than a simple reproduction.
It carries the same iconic spirit — yet with upgraded engineering, superior craftsmanship, and performance that not only matches but confidently surpasses the original in control, drive capability, and transient response.
From the finely detailed chassis finishing to the internal architecture, every aspect has been elevated. This is a high-current, high-control, high-quality power amplifier built for serious music lovers.
True Dual-Mono Architecture Inside
Lift the top cover and you are immediately greeted by a massive stainless-steel transformer enclosure. It may appear to house a single transformer — but inside are two independent 500W audio-grade transformers.
Each channel has:
- Its own dedicated transformer
- Completely separate primary and secondary windings
- Fully independent power supply structure
This means the left and right channels operate as two completely independent amplifiers within one chassis — a rare feature at this level.
Each transformer is specially treated and fully encapsulated in a custom shielding enclosure to eliminate magnetic leakage, ensuring ultra-clean power delivery and low noise performance.
Massive Power Reserve & Output Stage
Mounted to the large side heatsinks are two dedicated amplifier boards.
Each channel features:
- 8 high-power Japanese audio transistors
- 4 pairs rated at 150W each
- Total device capability of 600W per channel — for a 150W output amplifier
This enormous power reserve means:
- Effortless speaker control
- Strong grip over large voice-coil drivers
- Outstanding transient attack
- High dynamic stability
- Authority even at demanding listening levels
This is not just about wattage — it is about current capability and control.
Custom 47,000µF Capacitor Banks
To achieve superior drive and musical performance, no expense was spared.
Each channel uses:
- 2 × 47,000µF custom high-capacity reservoir capacitors
These oversized capacitors provide massive energy storage, delivering instantaneous current when the music demands it.
Why Large-Capacity Capacitors Matter:
Stable Operation at High Volume
They store and release energy rapidly to meet sudden current demands from loudspeakers, reducing voltage fluctuation and ripple.
Enhanced Bass Performance
By stabilizing the power supply, low-frequency reproduction becomes deeper, tighter, and more controlled — with improved clarity and impact.
Lower Noise Floor
Large capacitors effectively filter high-frequency power noise, resulting in a cleaner, purer audio signal.
Expanded Dynamic Range
When playing high-dynamic recordings, the amplifier maintains authority without compression or signal collapse.
This is why true high-end amplifiers rely on substantial capacitor banks — and the RG4 MK4 proudly follows that philosophy.
Comprehensive Protection System
The RG4 MK4 includes full protection circuitry for long-term reliability:
- Soft-start protection
- Thermal protection
- DC offset protection
- Overload protection
- Output relay speaker protection
Your speakers — and your investment — are fully safeguarded.
Power Output & Specifications
Output Power:
- 150W + 150W @ 8Ω
- 250W + 250W @ 4Ω
- 400W + 400W @ 2Ω
Signal-to-Noise Ratio: 110dB
Gain (Single-ended): 30x (fixed)
Input Sensitivity: 1.2V
Input Impedance: 22kΩ
Input: 1 × RCA (single-ended)
Total Harmonic Distortion: 0.005% THD
Frequency Response: <1Hz – 60kHz (±3dB)
Standby Power Consumption: 35W
Dimensions: 445W × 160H × 200D mm
Weight: 17.5kg (Shipping weight: 19.5kg)
Designed for High-Current Drive
The RG4 MK4 is engineered with a unique high-current circuit topology specifically optimized to drive large voice-coil speaker units.
It delivers:
- Strong, authoritative bass
- Clean, natural midrange
- Smooth, extended highs
- Excellent control over difficult speaker loads
The Result
The RG4 MK4 is not merely a replica.
It is a refined evolution — combining classic German amplifier DNA with upgraded engineering, superior component selection, and modern execution.
For listeners who demand control, dynamics, stability, and musical realism —
this amplifier delivers with confidence and authority.
