At a glance
- Device type
- Headphone amplifier
- Amplifier technology
- Solid-state
- Headphone outputs
- 4-Pin XLR, 4.4 mm, 2× 6.3 mm
- Built-in DAC
- No
- Power
- 7 W @ 50 Ω · 3.4 W @ 300 Ω (from 32 V)
NiiMBUS US5 Pro
€6,499.00
Tax included
Reference-class headphone amplifier with huge output power, ultra-low noise and uncompromising sonic fidelity.
- ✓ Authorized Dealer · Original Warranty
- ✓ 30-day returns · Free return shipping
- ✓ Shipping: free to Italy · EU €19, free from €400
- ✓ Installment Payment Available
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At a glance
- Device type
- Headphone amplifier
- Amplifier technology
- Solid-state
- Headphone outputs
- 4-Pin XLR, 4.4 mm, 2× 6.3 mm
- Built-in DAC
- No
- Power
- 7 W @ 50 Ω · 3.4 W @ 300 Ω (from 32 V)
Niimbus US 5 PRO
Reference headphone & active-speaker amplifier with 256-step relay volume control
The Niimbus US 5 PRO is the refined successor to the acclaimed US 4 and US 4+ headphone amplifiers. It shares the core engineering of the US 5, while adding an ultra-precise 256-step volume control implemented via reed relays.
Enjoy a compact, outstanding-sounding headphone amplifier and a high-grade preamplifier in one unit. The sophisticated preamp function allows direct connection to power amplifiers or active speakers. Headphone and line outputs can be enabled/disabled separately from the front panel.
Premium multi-purpose design
A reference-class headphone amplifier plus a fully capable preamp stage: ideal for headphone rigs, power amps, or active speakers. Headphone and line outputs can be switched independently from the front.
Remote control
A beautifully machined, solid remote lets you control volume (256 steps), mute, input selection, plus headphone and line-out via infrared.
Technology highlights
- Perfect volume control: 256 precise steps via reed relays.
- Ultra-low noise: very low internal gain – self-noise is practically inaudible.
- High output voltage: ±50 V internal rails – ideal for high-impedance headphones.
- High output power: massive headroom – perfect for low-impedance and planar/magnetostatic headphones.
- High damping factor: extremely low output impedance for a strictly linear frequency response.
Features & connections
- 3 analog stereo inputs: 2× RCA (unbalanced), 1× XLR (balanced)
- Pre-Gain: –18 … +24 dB for perfect matching between source and headphones
- Motorized volume control and manual balance knob
- 4 amplifier stages: 7000 mW Pmax @50 Ω, 32 V RMS @600 Ω
- Headphone output monitoring (DC & clipping)
- Headphone and line outputs individually switchable
- Headphone outputs: 1× 4-pin XLR (bal.), 1× 4.4 mm Pentaconn (bal.), 2× 6.3 mm (1/4") (unbal.)
- Line-out: 1× RCA (unbal.), 1× XLR (bal.), adjustable level ±12 dB
- 2 toroidal transformers, > 50,000 µF filter capacitance
Package contents
- 1× Niimbus US 5 PRO
- 1× User Manual
- 1× Remote Control
Technical Data
| Item No. | 1008071 |
| Amplifier Type | ALPS RK27 |
| Volume Potentiometer Type | ALPS RK27 |
| Volume Knob | ALPS RK27 |
| Colour | black |
Data sheet
- Device type
- Headphone amplifier
- Amplifier technology
- Solid-state
- Built-in DAC
- No
- Power into 32 Ω
- 7 W @ 50 Ω
- Power into 300 Ω
- 3.4 W @ 300 Ω (from 32 V)
- Headphone outputs
- 4-Pin XLR, 4.4 mm, 2× 6.3 mm
- Balanced output
- Yes
- Inputs
- 2× RCA, XLR
- Pre-amp output
- Yes
