If you are new to home audio, walking into the world of separate components can feel like learning a new language. Terms fly around, numbers get thrown at you, and it is easy to feel lost. This guide is here to fix that. We are going to walk through the Yamaha A-S801 in plain English, so by the end you will understand exactly what it does, why it might belong in your home, and whether it is right for you.
What is the Yamaha A-S801?
The Yamaha A-S801 is an integrated amplifier, which means it is the central brain and muscle of a music system. An integrated amplifier combines two jobs into one box. The first job is a preamplifier, which selects what you want to listen to and controls the volume. The second job is a power amplifier, which takes that signal and boosts it enough to drive your speakers and fill a room with sound. Buying these as one unit keeps things simple and saves space compared to buying separate boxes.
Where does it fit in my system?
The A-S801 sits in the middle of your system, connecting your sources to your speakers. On one side you plug in things that make sound, like a turntable, a CD player, or your computer. On the other side you connect a pair of speakers. The amplifier is the traffic controller and the engine all in one, taking whatever you want to play and delivering it to your speakers with enough energy to sound alive.
The Sound and Power
How much power does it have, and what does that mean for me?
The A-S801 delivers 100 watts per channel into 8 ohm speakers across the full range of human hearing (20 Hz to 20 kHz) at very low distortion. In everyday terms, that is plenty of power for the vast majority of living rooms and speakers. Watts describe how much energy the amplifier can push into your speakers, and "per channel" means each of your two stereo speakers gets its own 100 watts. If your speakers are a more demanding 4 ohm design, the amplifier steps up to 120 watts per channel. It also has 130 watts of dynamic power per channel into 8 ohms, which is a short burst of extra muscle for sudden loud moments in music, like a drum hit or a crescendo.
What does THD and distortion mean in real listening?
THD stands for Total Harmonic Distortion, and the A-S801 measures a very low 0.019 percent (measured across 20 Hz to 20 kHz at 50 watts into 8 ohms). Distortion is any unwanted change the amplifier adds to the music that was not in the original recording. A lower number means the sound coming out is cleaner and truer to what the artist intended. A figure this low means the amplifier is doing its job faithfully without muddying the music.
What is signal-to-noise ratio and why should I care?
The signal-to-noise ratio is 99 dB, which tells you how quiet the amplifier is when no music is playing. Every electronic device produces a small amount of background hiss or hum. A higher number here means the music stands out clearly above any faint electronic noise. In practice, a rating of 99 dB means you get quiet, black backgrounds so the details and soft passages in your music come through cleanly.
What does frequency response tell me?
The frequency response is 10 Hz to 100 kHz (measured from the CD input, +0/-3.0 dB). This describes the range of tones the amplifier can reproduce, from the very lowest bass notes to the highest treble. Human hearing generally tops out around 20 kHz, so a range that reaches all the way to 100 kHz means the amplifier handles everything you can hear with room to spare. The result is full bass and clear highs without the amplifier running out of range.
What is damping factor?
The damping factor is 240 or greater (measured at 8 ohms, 1 kHz). This is a measure of how firmly the amplifier controls the movement of your speaker cones, especially the bass driver. A higher damping factor means the amplifier keeps a tighter grip, so bass sounds punchy and controlled rather than loose or boomy. A figure of 240 or more indicates strong control for tight, articulate low end.
Connections and Digital Features
Does it have a built-in DAC, and what is that?
Yes, the A-S801 includes a high quality digital-to-analog converter, or DAC, built around the ESS SABRE ES9010K2M chip. A DAC translates digital audio, like the files on your computer or a streaming service, into the analog signal your speakers need. Because it is built in, you can connect a computer directly and skip buying a separate converter. It handles PCM audio up to 384 kHz and 32-bit, and DSD up to 11.2 MHz over USB, which means it can play even very high resolution music files with ease.
What can I plug into the digital inputs?
The A-S801 offers a USB Type B input, one optical input, and one coaxial input. The USB input connects to a computer for playing your digital music library. The optical and coaxial inputs accept digital signals from devices like a TV, a CD transport, or a streamer. Each of these feeds into the built-in DAC, so anything digital you connect gets the same high quality conversion.
Can I connect a turntable or other analog sources?
Yes, the A-S801 has five line inputs plus a dedicated moving magnet phono input. The five line inputs are for standard analog devices like a CD player or a cassette deck. The phono input is special because turntables produce a very weak signal that needs extra amplification and correction. This built-in phono stage means you can plug most turntables (those with a moving magnet cartridge) straight in without buying a separate phono preamp.
What outputs and controls does it have?
The A-S801 provides two sets of speaker terminals labeled A and B, plus a headphone jack. The A and B speaker outputs let you connect two pairs of speakers, useful if you want sound in another room or a second listening position. The headphone jack lets you enjoy private listening without disturbing anyone. Note that there is no dedicated subwoofer output, so this is designed primarily as a full stereo speaker system.
Build Quality and Who It Suits
Why does Yamaha build quality matter?
Yamaha has been making musical instruments and audio equipment for well over a century, and that heritage shows in how their components are built. The A-S801 measures 435 by 157 by 396 mm and weighs 13.1 kg. That weight is a good sign, because a heavier amplifier usually means a substantial power supply and solid internal parts, which contribute to steady, confident sound. Yamaha components are known for clean, timeless design with clear controls and a reassuring solidity that suggests they are made to last for years.
Who is the Yamaha A-S801 for?
The A-S801 is ideal for someone building a quality stereo system for the first time who wants one capable box that does nearly everything. It suits music lovers who mix formats, since it welcomes vinyl through its phono input, digital files through its DAC, and standard sources through its line inputs. If you want a straightforward, well built amplifier that connects to a turntable, a computer, and a pair of speakers without a pile of extra equipment, the A-S801 is a genuinely welcoming place to start.
