Ultrafide U500DC Power Amplifier
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- Official Hi-Fi Retailer since 1973
- Usually in stock and dispatched in 1-5 working days
We offer free delivery on all orders over £100 to mainland UK. Orders under £100 are subject to a £6.50 shipping charge.
Delivery is available across mainland UK. If you are located outside mainland UK and would like a shipping quote, please get in touch before placing your order.
We aim to dispatch in-stock items as soon as possible provided that we physically have the stock - but please note that sometimes we have to order from our supplier for certain products, in which case delivery should take place within 1-5 working days of the order being placed.
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You can cancel your order within 14 days of receiving your goods, in line with UK distance selling regulations. Once you’ve notified us, you have a further 14 days to return the item. Please contact us by email, phone or in writing before sending anything back.
Items must be returned in original condition and packaging, including all accessories, manuals and any promotional items. The cost of return is your responsibility and we strongly recommend insuring the goods, as refunds cannot be issued for damaged or incomplete returns. If items show excessive handling, are missing components, or cannot be resold as new, a reasonable deduction may be made.
Please note that used headphones (for hygiene reasons) and custom or special-order items cannot be returned. If you need assistance arranging a return, we’re always happy to help.
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.
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
