Niimbus
US 5 Pro
The Niimbus US5 Pro is a flagship solid-state desktop headphone amplifier and preamplifier designed by Fried Reim (Lake People/Violectric), built around a completely symmetrical dual-mono circuit with four discrete amplification stages and 60V internal rail voltage for very high current delivery. It uses a 256-step reed-relay volume control for precise, channel-matched attenuation and offers both single-ended and balanced (4-pin XLR, 4.4mm Pentaconn) headphone outputs capable of driving virtually any headphone load ([Violectric official product page](https://www.violectric.de/en/products/headphone-preamps/niimbus-us-5-pro), [Audio46 listing](https://audio46.com/products/niimbus-us-5-pro-headphone-amplifier)).
MSRP
$6,971
Used market · Mint
$4,500
MSRP to used market
From $6,971 at launch to $4,500 today.
Specifications
- THD
- <0.00005% (Frieve); 0.00063% @ 10V/100Ω, 1W and 0.00071% @ 4V/32Ω, 0.5W (Audio46)
- Gain
- Adjustable pre-gain −18 to +24 dB
- Price
- €5,999
- Inputs
- 2× RCA unbalanced, 1× XLR balanced analog stereo inputs
- Dimensions
- 351mm (W) × 90mm (H) × 275mm (D)
- Line outputs
- 1× RCA unbalanced, 1× XLR balanced (±12dB adjustable)
- Power output
- 7,000 mW max @ 50Ω; 32V RMS @ 600Ω
- Volume control
- 256-step reed-relay attenuator with motorized ALPS RK27 knob
- Headphone outputs
- 1× 4-pin XLR balanced, 1× 4.4mm Pentaconn balanced, 2× 6.3mm single-ended jacks
- Frequency response
- 5Hz–250kHz within −0.5dB
- Signal to noise ratio
- >130 dB (Frieve); >129 dB A-weighted (Audio46); dynamic range 135 dB
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