Description
The moment you remove the top cover, your eyes are immediately drawn to the massive stainless-steel transformer enclosure. At first glance, you might assume it houses a single transformer powering the amplifier. If so — you would be mistaken.
Inside this custom shielded enclosure are two independent 550W audio-grade transformers, delivering a combined 1100W of total transformer power. Each transformer is specially treated and fully encapsulated to eliminate magnetic leakage, ensuring ultra-low noise and maximum purity of power delivery.
Why 1100W of Transformer Power Matters
A larger transformer means:
Stronger current delivery
Superior control over demanding loudspeakers
Effortless handling of large-scale symphonic dynamics
Deeper, tighter, more authoritative bass response
When a power supply is undersized, voltage sag occurs during dynamic peaks, leading to clipping and harsh high-frequency distortion. The RG4 MK4’s oversized transformer prevents this entirely — preserving smooth highs, natural mids, and powerful, controlled bass even at high listening levels.
Massive Power Supply & Energy Storage
Flanking the transformer are the amplifier’s high-capacity filter boards. Each board carries:
2 × 47,000µF capacitors
Independent ± voltage rail fuses for fine tuning and secondary protection
Each channel is equipped with 4 custom 47,000µF high-capacity reservoir capacitors, delivering extraordinary energy storage.
Benefits of Large-Capacity Power Storage:
Instantaneous current release for demanding speaker loads
Reduced voltage fluctuation and ripple
Improved low-frequency extension and impact
Cleaner background with lower noise floor
Expanded dynamic range
This is why true high-end amplifiers rely on massive capacitor banks — and the RG4 MK4 is no exception.
High-Power Output Stage
Each side of the chassis features a large heatsink mounted with a dedicated amplifier board.
Each board includes:
8 high-power Japanese audio transistors
Total of 16 power transistors
Combined output capability of 1200W**
This massive output stage ensures:
Immense current reserve
Effortless speaker control
Stability into low impedance loads
Authority, speed, and dynamic realism
Power reserve translates directly into sonic confidence.
True Balanced Design
From circuit architecture to physical layout, this amplifier is built with full symmetry.
Front panel:
Power LED
Protection indicator LED
Rear panel:
Centered AC input
Balanced XLR input
Single-ended RCA inputs
Heavy-duty speaker binding posts
The result is a true balanced amplifier design, both electrically and mechanically.
Comprehensive Protection System
The RG4 MK4 includes:
Soft-start circuit protection
Thermal protection
DC offset protection
Overload protection
Output relay speaker protection
Your speakers — and your investment — are fully protected.
GR-1 MK2 Dual Mono Balanced Power Amplifier – Specifications
Output Power:
400W @ 8Ω
700W @ 4Ω
1000W @ 2Ω
Signal-to-Noise Ratio: 110dB
Balanced Gain: 36x (fixed)
Single-Ended Gain: 30x (fixed)
Input Sensitivity: 1.2V
Input Impedance: 22kΩ
Inputs:
1 × Balanced (XLR)
2 × Single-ended (RCA)
Total Harmonic Distortion: 0.005% THD
Frequency Response: <1Hz – 60kHz (±3dB)
Power Consumption (Standby): 50W
Dimensions: 445W × 160H × 200D mm
Weight: 19.5 kg per unit
Designed for Serious Audiophiles
The RG4 MK4 is built for listeners who demand:
Deep, controlled bass
Smooth, non-fatiguing highs
Massive dynamic headroom
Absolute stability under demanding loads
True high-end construction quality
This is not just an amplifier.
It is a statement of power, precision, and musical authority.
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