U4PRE Quad Output Audiophile Pre-Amplifier

with integrated Phono Stage

The Ultrafide U4PRE (audiophile quad output pre-amplification system) provides the central core and control of an expandable and “future-proofed” audio system. A perfect partner to the U500DC Power amplifier, this pre/power combo delivers a truly high fidelity sonic signature.

Quad outputs available for use simultaneously, to allow signal distribution for multi-amping of loudspeakers

Class A circuits, minimum signal path, simplicity at its core

DC (and Super Low Frequency) Coupled Systems

Over engineered toroidal power supply

Highly configurable ultra premium phono stage – Suitable for use with a wide range of moving magnet and moving coil cartridges

Ultra premium, super powerful dsicreet class A/B headphone amplifier

OLED screen & Remote control for volume, balance, source select, mute, and standby etc

Expansion port for additional future interfaces (carries dc power and signal)

Pair with the U500DC for the ultimate sound experience

Audio Channels (quantity)	2	Left & Right
Audio Inputs	10	6 RCA (Single Ended)
Audio Inputs	10	4 XLR (Balanced)
Input Impedance RCA	47k
Input Impedance XLR	10k
Input RFI Filtering Capacitance	RCA 100pF	XLR 500pF
Additional Phono Loads (adjustable)	7 steps 80R/500R	7 steps 150pF/470pF
Audio Outputs	10	4 RCA (Single Ended)
		4 XLR (Balanced)
		2 on ¼ inch H/Phone Jack
Output Impedance	Line 75R	Headphones 200mR
Maximum Output	Line 2.5Vrms	Headphones 7Vrms (1.5W)
Voltage Gain	Line nominal	0dB
	H/Phono nominal	+10dB
	Phono nominal	+35dB to +71dB in 3dB steps
Volume Control Range	-95dB to +10dB	1dB steps +-0.05dB
Sensitivity	Line	316mV nominal (2.4v max)
Sensitivity	Phono (1KHz)	0.16mV to 5 mV for 316mV
Dynamic Range (line)	115dB	Un-Weighted 22-22KHz
Phono Johnson Noise	Hi gan 0R source	EIN-146dBu
Distrotion	0.003%
Power Supply Connector	6A IEC
Fuse	1A
Nominal Power Supply Voltage	115Vac (60Hz) or 230Vac (50Hz)
Power Isolation Switch	On Rear Panel
Standby Switch	On Front Panel
Remote Standby	2 x Out	Connectors on Rear Panel
Power Indicator	Green indicates out of standby	Red indicates fault
Power consumption	Operational 20W	Standby 1W
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)

Operator Manual

Specification Sheet

Reverse view of U4PRE amplifier, showing the ports

Close up angled photo of the U4PRE amplifier

Inner workings image of a U4PRE amplifier

where to buy the u4pre amplifier

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