Niimbus US 5

Amplifier for Headphones and Active Loudspeakers

The Niimbus US 5 is the refined successor to the acclaimed US 4 and US 4+ headphone amplifiers. It combines a reference-class headphone amp with a premium preamplifier in a compact high-end unit – perfect for headphones, power amps and active speakers.

Premium Multi-Device

With its advanced preamp section, the US 5 can drive not only headphones but also power amplifiers or active speakers. Headphone and rear line outputs can be toggled individually from the front panel.

Remote Control

The elegant, solid-aluminium remote provides infrared control of the motorised volume, mute, input selection, and headphone/line-out routing.

Technology Highlights

• Lowest noise: very low internal gain keeps self-noise virtually inaudible.
• High output voltage: ±50 V internal supply – ideal for high-impedance headphones.
• High output power: powerful stages with ample reserves – great for low-impedance and magnetostatic headphones.
• High damping factor: extremely low output impedance for full control and a ruler-flat frequency response.

Features & Connections

• Remote for input/output selection, volume, mute
• 3 analogue stereo inputs: 2× RCA (unbalanced), 1× XLR (balanced)
• Pre-gain: –18 … +24 dB for perfect source/headphone matching
• Motorised volume and manual balance control
• 4 amplifier stages: 7000 mW Pmax @50 Ω, 32 V RMS @600 Ω
• DC and overload monitoring on headphone outputs
• Headphone and line outputs selectable independently
• Headphone outs: 1× 4-pin XLR (balanced), 1× 4.4 mm Pentaconn (balanced), 2× 6.3 mm jacks (unbalanced)
• Line-outs: 1× RCA (unbalanced), 1× XLR (balanced), output trim ±12 dB
• 2 toroidal transformers, > 50,000 µF filter capacity