Усилители мощности стерео — Venture Audio V120S

Of the two power amplifiers Venture Audio lists on its own site, the V120S is the lighter one, a two-channel unit built around MOSFET output devices working in class AB. Venture was started in 1986 by the physicist Njoo Hoo Kong and is known first of all for loudspeakers in its Quantum and Ultimate ranges, while the electronics catalogue is short - the V120S, the class A V200A+, the VP 100P phono stage and the VP 200DT preamplifier with a built-in DAC.

Key specs that matter

Venture rates the V120S at 240 W of nominal power into 4 ohm. Voltage gain is 30 dB. Both the RCA and XLR inputs present an impedance of 22 kOhm. The maker states a rise time under 1.8 μs and a power bandwidth running from 10 Hz up to 180 kHz. Total harmonic distortion is listed as 0.055 percent. The chassis measures 49 cm long, 43 cm wide and 17 cm high, and the amplifier weighs 25 kg.

Engineering and use context

The distortion value is specified with no total feedback, meaning the circuit does not rely on an overall loop from output to input to bring that figure down. Class AB operation lets the output MOSFETs idle at a lower current than a full class A stage, which is one reason the V120S weighs well under the 40 kg of its class A sibling and needs a far smaller case. The power bandwidth sits many times above the audio band, and the sub-2 μs rise time describes how fast the output can follow a steep input step. Both input types are offered, so the amplifier can take a balanced line from a professional or high-end preamplifier or a plain unbalanced link over a short run.

Pairing

With its high gain the V120S reaches full output from a modest drive level, and the input impedance places little demand on solid-state and valve preamplifiers alike. The house partner is the VP 200DT, which offers three XLR and four RCA analogue inputs plus two S/PDIF and one USB digital input, with a volume range from minus 66 dB to 0 dB. The power rating points to low-impedance loudspeakers as a normal load, including the passive models in Venture's own ranges.

Alternatives

The Venture V200A+ is the class A MOSFET power amplifier in the same catalogue, rated at 200 W into 8 ohm.