Интегральные усилители — Yamaha A-S701

The Yamaha A-S701 is a stereo integrated amplifier that pairs a classic analogue layout with a built-in digital input section, so a TV or disc player can be wired straight in. Yamaha describes it as an entry model in its HiFi component range, fronted by an aluminium panel with a silver hairline finish and a button layout borrowed from the brand's higher models.

Key specs that matter

Yamaha rates the minimum RMS power at 100 W per channel into 8 ohms across 20 Hz to 20 kHz at 0.019% THD, and the European maximum rating is 160 W per channel into 4 ohms at 1 kHz. Dynamic power per channel reaches 140, 170, 220 and 290 W into 8, 6, 4 and 2 ohms. Frequency response runs from 10 Hz to 100 kHz within plus or minus 1 dB, the CD input signal-to-noise ratio is 99 dB with the input shorted, and the damping factor is 240. Yamaha lists eight audio inputs and two outputs, one optical and one coaxial digital input, an MM phono terminal and a subwoofer output. The chassis measures 435 x 151 x 387 mm and weighs 11.2 kg, and standby draw is 0.5 W.

Engineering and use context

The circuit follows Yamaha's ToP-ART concept, with an input-to-output direct symmetrical design with left and right channel circuits placed in a straight, mirrored arrangement. An ART base bottom chassis and a solid centre bar add rigidity and damp vibration. Parts include a custom power transformer, custom 12,000 uF block capacitors, two direct signal path speaker relays, one-point grounding and extruded aluminium heat sinks. CD Direct Amplification links the CD input straight to the power stage, while Pure Direct mode bypasses the buffer amplifier along with the tone, loudness and balance controls. A continuously variable loudness control on the front panel works through an electronic volume circuit, separate from the main volume. Speaker terminals and RCA inputs are gold plated, and an auto power standby function is included.

Pairing

The optical input is intended for a TV and the coaxial input for a Blu-ray player, keeping those sources in the digital domain. A DC output on the rear panel can power the optional YBA-11 Bluetooth adapter, which uses aptX coding. Speaker A, B or A+B switching over four sets of terminals allows two separate speaker systems in different rooms, and the subwoofer terminal accepts a powered bass unit. The phono stage is designed for turntables fitted with a moving magnet cartridge.

Alternatives

The Yamaha A-S801 is another integrated amplifier in the same A-S range from the brand.