Ultrafide U500DC Power Amplifier - Ex-Demonstration
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Product Summary
The Ultrafide U500DC is a high-performance stereo power amplifier designed to bring professional-grade amplifier engineering into a serious home hi-fi system. Handmade in Devon, it draws on decades of experience from MC² Audio’s work in studios, theatres, festivals and live sound, but is built specifically for demanding domestic listening.
Delivering 500 W per channel into 4 Ohms and 250 W per channel into 8 Ohms, the U500DC has the power and control needed to drive a wide range of loudspeakers with confidence. Its dual mono design, oversized 500 VA toroidal transformer and separate power supply architecture help provide strong stereo separation, stable dynamics and controlled low-frequency performance.
Ultrafide’s in-house Ultra Sigma topology uses a modern Class D output stage based on Sigma-Delta modulation, partnered with a Class A input driver stage. The amplifier is fully DC coupled from input to output, helping preserve transient accuracy and keep bass response tight, focused and immediate.
A rear-panel sound character switch lets you choose between Pure Timbre for a cleaner reference-style presentation or Vintage for a warmer tonal balance. With RCA and balanced XLR inputs, dual binding posts per channel and passive cooling, the U500DC is a powerful, flexible and refined power amplifier for high-quality stereo systems.
This is an ex-demonstration model that has been very well cared for. It comes supplied with original boxing and accessories.
Key Benefits
- Delivers effortless speaker control with 500 W per channel into 4 Ohms and 250 W per channel into 8 Ohms
- Brings professional audio amplifier expertise into a high-quality home hi-fi system
- Dual mono design helps improve stereo separation, focus and dynamic stability
- Class A input driver stage and fully DC-coupled signal path support fast, accurate transient response
- Ultra Sigma Class D topology offers high power, low distortion and efficient operation
- Massive 500 VA toroidal transformer and linear power supply help maintain strong, stable delivery
- Pure Timbre and Vintage modes let you choose between a reference sound or a warmer presentation
- Balanced XLR and RCA inputs make it easy to integrate with a wide range of pre-amplifiers
- Passive cooling keeps operation quiet with no fan noise in the listening room
- 5 years manufacturer's warranty
Technical Specifications
Amplifier Type
- Type: Stereo power amplifier
- Channels: 2
- Design Topology: Ultrafide Ultra Sigma Class D topology with Sigma-Delta modulation
- Input Driver Stage: Class A
- Inter-stage Coupling: Fully DC coupled
- Power Supply: Oversized linear/toroidal power supply with 500 VA transformer
- Cooling: Passive cooling
- Made In: Devon, United Kingdom
Power Output
- RMS Power into 4 Ohms: 500 W per channel
- RMS Power into 6 Ohms: 333 W per channel
- RMS Power into 8 Ohms: 250 W per channel
- RMS Power into 12 Ohms: 166 W per channel
- Maximum Voltage: 70 V
- Maximum Current: 30 A, pulsed testing
Audio Performance
- Frequency Response: 5 Hz – 20 kHz, ±0.3 dB
- Distortion: 0.003% at 5 W
- Dynamic Range: 115 dB, unweighted, 22 Hz – 22 kHz
- Output Impedance: 25 mOhms
- Input Impedance: 10 kOhms, RCA and XLR
- Sensitivity: 2.2 V
- Voltage Gain: 26 dB standard factory setting, 29 dB optional high gain setting
Connections & Controls
- Audio Inputs: 2 × RCA single-ended and 2 × XLR balanced
- Audio Outputs: 4 pairs of binding posts
- Sound Modes: Pure Timbre and Vintage, selected by rear-panel switch
- Power Supply Connector: 10 A Furutech C13 IEC
- Power Isolation Switch: Rear panel
- Standby Switch: Front panel
- Remote Standby Connector: Rear panel
Power Consumption
- Operational Power Consumption: 200 W average, 1000 W maximum
- Idle Power Consumption: 15 W
- Standby Power Consumption: 1 W
- Nominal Supply Voltage: 230 V AC 50 Hz or 120 V AC 60 Hz
Physical
- Dimensions (L × W × H): 382 × 325 × 97 mm
- Weight: 13.05 kg
- Packed Dimensions (L × W × H): 590 × 405 × 152 mm
- Packed Weight: 14.65 kg
What’s in the Box
- Ultrafide U500DC stereo power amplifier
- Mains power cable
- Product documentation
