B-Stock: Violectric NIIMBUS-US5-PRO Headphone Amplifier

The Niimbus US 5 PRO is the improved successor to the famous Niimbus US 4 and US 4+ headphone amplifiers. The US 5 and US 5 PRO versions have the same brilliant technology, the US 5 PRO also offers a finely graduated volume control in 256 precise steps. Premium multi-device - Versatile high-end amplifier Enjoy a compact and fantastic sounding headphone amplifier and a premium preamp. The Niimbus US 5 PRO has a sophisticated preamp function to drive direct power amplifiers or active speakers in addition to your headphones. This gives you two high-end devices in one! The US 5 series has powerful, noise-free and perfect-sounding circuits to drive any dynamic and magnetostatics headphone in the best possible way. The headphone outputs and the rear line outputs can be activated/deactivated using a switch on the front. Versatile remote control: For undisturbed listening pleasure, almost all functions can be controlled via the elegantly designed remote control milled from one piece. Infrared gives you access to the motorized volume control, mute, input selection, headphone and line-out control. Overview: Thanks to its incomparable technology, the Niimbus US 5 PRO is one of the most powerful headphone amplifiers on the market. It is characterized by: Lowest noise - due to a very small internal gain. As a result, the inherent noise of the amplifiers is inaudible. High output voltage - due to 50-volt internal operating voltage. Therefore, ideally suited for high-impedance headphones. High output power - through powerful amplifiers that can deliver far more power than even the most demanding headphone can need. Therefore, ideally suited for headphones with low impedances and also magnetostatics. High damping factor - due to the lowest output impedance. Therefore, ideally suited to control even the most difficult headphones without influencing them with a guarantee for an uncompromising frequency response.

Nearly all functions can be conveniently controlled using a stylish remote.

With its incomparable technology, Niimbus US 5 not only offer one of the most powerful headphone amplifiers in the market, but also:

Lowest Noise - through a very small amount of internal gain. This makes the amplifier's self-generated noise inaudible.

High Output Voltage - through 60 V internal operating voltage. Therefor ideally suited for high-impedance headphones deserving high output voltage swing.

High Output Power - thanks to powerful amplifiers that offer far more power even the most demanding headphones would need. So, best suited for headphones with low impedances as well as planar (magnetostatic) headphones!!

High Damping Factor - due to lowest output impedance. Therefor the ideal match for difficult to drive headphones without negative side effects and with the guarantee for a uncompromising frequency response

The Niimbus US 5 PRO offers

Remote control for input selection, output selection, volume, mute

3 analogue stereo inputs, 2 x unbalanced via RCA, 1 x balanced via XLR

- 18 … +24 dB Pre-Gain to perfectly adapt the US 5 / 5 PRO between source and headphones

A motorized volume control and a balance control

4 powerful amps offering 7000 mW Pmax into 50 Ohm and 32 V RMS into 600 Ohm

Monitoring of the headphone output in terms of DC and overload

Headphone path and line-out path individually selectable

1 balanced headphone output with 4-pin XLR

1 balanced headphone output with 4,4 mm Pentaconn

2 single ended outputs with 6,3 mm jack

2 x Line-outputs, 1 x unbalanced via RCA, 1 x balanced via XLR

Adaptation of the line-out signal to the following devices in the range of +/- 12 dB

2 toroidal transformers, > 50,000 uF filter capacity.

B-stock may have minor cosmetic scratches or dents and furthermore B-Stock is not covered by full manufacturer warranty.  Please call for details.

Product Specifications:

Number of Headphone Channels: 2-Channel

Recommended Headphone Impedance: 4 to 600 Ohms

Headphone Output Power: 7000 mW into 50 Ohms (0.01% THD, 1 kHz)

EQ: No

Display: No

Connectivity:

Analog Audio I/O: 4x RCA Coaxial Unbalanced Line Input (2 Stereo Pair, Rear Panel)

2x XLR 3-Pin Balanced Line Input (1 Stereo Pair, Rear Panel)

2x RCA Coaxial Unbalanced Line Output (1 Stereo Pair, Rear Panel)

1x 4.4 mm TRS Balanced Stereo Headphone Output (Front Panel)

2x 1/4"" TRS Unbalanced Stereo Headphone Output (Front Panel)

2x XLR 3-Pin Balanced Line Output (1 Stereo Pair, Rear Panel)

1x XLR 4-Pin Balanced Stereo Headphone Output (Front Panel)

Digital Audio I/O: No

Network I/O: No

USB I/O: No

Performance:

Frequency Response: 5 Hz to 250 kHz ±0.5 dB

Maximum Input Level:

Line: +21 dBu (10 Kilohm Input Impedance)

Dynamic Range: > 135 dB (A-Weighted)

Impedance:

Outputs:

0.1 Ohm (Unbalanced)

0.2 Ohm (Balanced)

THD+N:

< -104 dB / < 0.00063% (At 1 kHz/2 x 10V/100R = 1W)

< -103 dB / < 0.00071% (At 1 kHz/2 x 4V/32R = 0.5W)

SNR: > 129 dB (A-Weighted)

Noise: < -104 dBu (A-Weighted)

Crosstalk:

-105 dB (1 kHz)

-103 dB (15 kHz)

Damping Factor:

500 at 50 Ohms (Unbalanced)

250 at 50 Ohms (Balanced)

Power:

Power Requirements: AC Input

AC Input Power: 115 to 230 VAC, 50 / 60 Hz (T 1 A)

AC/DC Power Adapter: No

Power Consumption: 50 VA (Maximum)

Dimensions: 13.8 x 9.8 x 2.3" / 35.1 x 24.8 x 5.9 cm (Chassis Only)

Shipping Weight: 17.515 lbs.

Shipping Dimensions (LxWxH): 18.7 x 15 x 6"