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Niimbus is a new premium brand created by Lake People in Germany, dedicated to its flagship headphone amplifier and decoding products. US4 and US4+ are its first pure amp products, which are pure amp and preamplifiers designed for the full balance of transistors.
US4+ has a four-core balanced headphone port and two 6.35mm headphone ports.
US4+ has one XLR balanced analog input, two RCA analog inputs, and an input selection button. With one XLR and one RCA preamp output(Controlled by volume).
The US4+ has two sets of input and output gain adjustments, which can be adjusted directly behind the machine by jumpers. There are 4 gains.
The front output and headphone output of US4+ can be turned on or off respectively. If it is connected to a speaker system as a front-end, the amp output can be turned off when listening to the speaker. When using listening headphones as an amp, you can turn off the front output.
Dimensions: width 35 cm, depth 28 cm, height 8 cm
Built-in two 25-watt loops, Nichikon filter capacitors up to 52800 microfarads, all coupling capacitors are PP film capacitors
The signal-to-noise ratio is increased by 12 decibels on the basis of V281, and the output power is further increased on the basis of V281.
Output impedance: < 15 Ohm
Signal-to-noise ratio (SNR): > 129 dB (A-gew.)
Frequency response: 0 - 200 kHz
Maximum output level: 32,4 (600 Ohm) 30,4 dBu (100 Ohm) 27,7 dBu (50 Ohm) 24,8 dBu (32 Ohm) 19,4 dBu (16 Ohm) 13,3 dBu (32 Ohm) 7,3 dBu (16 Ohm)
Crosstalk: -106 dB (1 kHz) -105 dB (15 kHz)
Total harmonic distortion (THD): 0,00063 % (@ 10V/100 Ohm, 1W) 0,00071 % (@ 4V/32 Ohm, 0,5W)
net weight: 7,50 kg