U500DC

Ultra Fidelity Audiophile stereo Power Amplifier

A total start again process allowing freedom to over engineer.Reinventing the Amplifier utilising years of experience, taking things into the future in terms of energy efficiency, whilst giving a classic British ethos.

2 channels of 500W @ 4 Ohms | 250W @ 8 Ohms, Ultra high fidelity amplification

Massive 500VA toroidal transformer for linear PSU

Brand New “ground up” design featuring our own in-house class D “Ultra Sigma” topology utilising Delta-Sigma modulation

Dual mono design with separate bridge rectifiers per channel

Fully DC Coupled input to output, Class A driver stage

Pure Timbre for uncoloured/reference sound signature, or Vintage, to engage classic warmth – activated by a rear panel high quality switch

Pair with the U4PRE for the ultimate sound experience

Audio Channels (quantity)	2	2 RCA (Single Ended)
Audio Inputs	4	2 XLR (Balanced)
NOTE: Both input types are always active; thus 2 sources can be summed if desired
Input Impedance	10k	RCA and XLR
Input RFI Filtering Capacitance	550pF	RCA and XLR
Audio Outputs	4 pairs	Binding Post
NOTE: Double channel connectors allow separate Tweeter and Woofer cables if desired
Output Impedance	25mR
Maximum Voltage	70V
Maximum Current	30A	(pulsed testing)
Voltage Gain	26dB (standard factory setting)	29dB
Current Gain	50,000	94dB
Sensitivity	2.2 Volts
Dynamic Range	115dB	Un-Weighted 22-22kHz
Inter-stage Coupling	DC Coupled
Frequency Response	5 to 20kHz	+-0.3dB
Distortion	0.003% at 5W	+-0.3dB
Rise/Fall Time	10uS
Stability	Unconditional
RMS Power into 4R	500W	600W at high gain setting
RMS Power into 6R	333W	400W at high gain setting
RMS Power into 8R	250W	300W at high gain setting
RMS Power into 12R	166W	200W at high gain setting
NOTE: Amplifier is stable into 2 ohm loads but with no increased power.**
Power Supply Connector	10A Furutech C13 IEC
Fuse	10A
Nominal Power Supply Voltage	230Vac (50Hz)	or 120Vac (60Hz)
Power Voltage Selector	Internal
Power Isolation Switch	On Rear Panel
Standby Switch	On Front Panel
Remote Standby	Connector on Rear Panel
Power Consumption operational	200W average	1,000W max
Power Consumption Idle	15W
Power Consumption Standby	1W
Current Consumption	230v – 1A nominal (5A max)	120v – 2A nominal (10A max)
Power Indicator	Green for Out of Standby
Fault Indicator	Red Led illuminates if clipping or protection is active
Product size / weight (packed)	590(L) x 405(W) x 152(H)mm	14.65kg (GROSS)
Product size / weight (unpacked)	382(L) x 325(W) x 97(H)mm	13.05kg (NET)

Front cover of the U500DC Operators Manual

Operator Manual

Specification Sheet

Quick Start Guide

Ultrafide U500DC on white surface next to plantside angled

where to buy the U500DC

What the press are saying

“How does the U4PRE stack up to a well-thought-out valve preamplifier…? Exceedingly well and is, in fact, preferable in comparison. This is by far the best solid-state internal preamplifier I’ve heard yet. Putting both the U4PRE and U500DC together, you get the very essence of a phenomenally explosive and powerful sounding combo of sonic magnitude.”

Tannoyista

“Both Ultra Sigma models have clearly been developed over time in a considered way, meaning what you get is a well thought out and finely executed package. Given the quality of these products, I expect we’ll be seeing and hearing a lot more from Ultrafide Audio in the future.”

Audiograde (Audiograde Recommended)

“We can see the Ultrafide U4PRE and U500DC amplifiers winning many fans for build, design and sound quality. This combination could be the one that puts Devon firmly on the map for hi-fi and music lovers.”

The Ear