Усилители мощности стерео — Schiit Audio VIDAR 2F

The VIDAR 2F is a stereo power amplifier from Schiit Audio, the version of the Vidar 2 that adds Forkbeard compatibility. Schiit calls it an exotic-topology, Class-AB, linear-supply, microprocessor-controlled, power-doubling design that drives almost anything, and the list price is USD 799. The chassis, transformers and circuit boards are made in California, with final assembly in San Antonio, Texas.

Key specs that matter

Rated output is 100 W RMS per channel into 8 ohm and 200 W RMS per channel into 4 ohm, and a single unit bridged to mono delivers 400 W RMS into 8 ohm. Frequency response is 20 Hz to 20 kHz within 0.03 dB and 3 Hz to 500 kHz within 3 dB. THD is below 0.004% and CCIR intermodulation below 0.005%, both measured at 100 W RMS into 8 ohm. Signal-to-noise ratio exceeds 123 dB A-weighted, referenced to full output, damping factor is above 100 into 8 ohm across the audio band, and crosstalk is better than 90 dB. Gain is 20 times, or 26 dB, with an input sensitivity of 28 V divided by 20. Input impedance is 22 kohm on the RCA pair and 44 kohm on the XLR, which serves the mono mode. The case measures 229 x 330 x 98 mm and weighs 10 kg. Finishes are black or silver.

Engineering and use context

Schiit's circuit is a current-feedback, fully complementary topology built entirely with 2SC and 2SA bipolar transistors, and Schiit keeps every capacitor out of the DC-coupled audio route. A 600VA transformer feeds dual-mono main rails with 40,000 uF of filter capacitance, 20,000 uF per channel, and there is no Class D stage, no switching supply and no fan. A 32-bit microprocessor watches for overcurrent and thermal faults and opens a relay to protect the speakers. Maximum consumption reaches 700 W, while the front-panel standby switch drops the draw to 1 to 2 W. Through Forkbeard the owner can switch standby remotely, read the output of each channel in real time and receive health alerts. Schiit covers parts and labour with a 5-year limited warranty and offers a 15-day money-back guarantee less a 5% restocking fee.

Pairing

Since output doubles as impedance halves, the amplifier can take on low-impedance loudspeakers, and a second VIDAR 2F turns the pair into mono blocks for larger speakers. Because the input gain is fixed, a preamplifier or a DAC with volume control belongs ahead of it.

Alternatives

The Schiit WOTAN is a stereo speaker amplifier with two 600VA transformers, rated at 200 W RMS per channel into 8 ohm.