If you are new to high-end audio, the Accuphase E-700 is one of the friendliest ways to fall in love with music all over again. It looks like a serious piece of equipment, and it is, but the ideas behind it are surprisingly easy to understand once someone explains them in plain language. That is exactly what this guide is here to do. No jargon left unexplained, no assumed knowledge, just a clear tour of what this amplifier does and why people treasure it.
What Is the Accuphase E-700 and Where Does It Fit?
What is an integrated amplifier, and what does the E-700 do?
An integrated amplifier is the heart of a hi-fi system that combines two jobs in one box: choosing and controlling your sources, and powering your loudspeakers. In practice this means you connect your music sources (a CD player, a turntable, a streamer) to the E-700, and it in turn connects to your speakers. It selects which source you are listening to, sets the volume, and provides the muscle that actually drives the speakers to make sound. Because it does all of this in a single unit, you do not need to buy separate boxes for the preamplifier (the control part) and the power amplifier (the muscle part).
What kind of amplifier is the E-700 within Accuphase's range?
The E-700 is a Pure Class-A integrated amplifier, which places it among the most refined models Accuphase makes. Accuphase offers both Class-AB integrateds (efficient and higher in wattage) and Class-A integrateds like this one (which prize linearity and smoothness above raw power). The E-700 sits in the Class-A family, so it is built for listeners who care most about tonal purity and effortless musical detail.
The Volume and Signal Path
What is the AAVA volume control, and how does it work?
AAVA (Accuphase Analog Vari-gain Amplifier) is Accuphase's special volume control that changes loudness without using a traditional volume knob's wearing parts. A normal amplifier uses a variable resistor (a component that rubs against a track as you turn the knob) to reduce the signal, and these wear out and can cause imbalance between left and right channels over time. AAVA instead converts your music into 16 weighted current sources and adjusts volume by switching combinations of them on and off, giving 65,536 fine steps. Because there is no wearing resistor in the signal path, the sound stays clean at every volume level, the two channels stay perfectly balanced, and the background silence (the signal-to-noise ratio) barely changes whether you listen quietly or loudly.
Why does the signal-to-noise ratio staying constant matter?
Signal-to-noise ratio describes how much louder your music is than the amplifier's own faint background hiss, and a higher number means cleaner, quieter backgrounds. The E-700 reaches 121 dB on its high level input, which is exceptionally quiet. In everyday listening this means silence sounds truly silent, and quiet passages of music emerge from a black background rather than a faint haze. Thanks to AAVA, this quietness holds up even at low volumes, which is where lesser designs tend to get noisier.
Power and Speaker Control
What does Pure Class-A operation actually mean for the listener?
Pure Class-A means the amplifier's output transistors (the parts that do the heavy lifting) stay fully switched on at all times, which removes a type of distortion that happens when transistors turn on and off. Many amplifiers let their transistors rest between waves of the signal, and the moment of switching can add a small roughness called crossover distortion. Class-A avoids this entirely, giving very smooth, linear sound. The trade-off is that it runs warm and uses more energy, which is why Class-A amplifiers publish lower wattage figures than efficient designs. That is a feature, not a shortfall: it is the price of maximum purity.
Is 35 watts per channel enough power?
Yes, for most speakers in most rooms, 35 watts of Pure Class-A power is plenty, and the way it doubles as the load gets harder tells the real story. The E-700 delivers 35 watts per channel into 8 ohms, 70 watts into 4 ohms, and 140 watts into 2 ohms. Ohms measure how hard a speaker is to drive, and lower numbers are more demanding. The fact that the power neatly doubles each time the load halves shows the amplifier has strong, stable current delivery, which means it stays composed even with challenging speakers. Class-A watts also tend to sound fuller and more effortless than the same number from a less refined design.
How does current feedback improve the sound?
Current feedback is Accuphase's power-amplifier design that monitors the signal as a current rather than a voltage, which keeps the amplifier fast and stable across a very wide range of frequencies. Feedback is a technique where the amplifier checks its own output and corrects errors on the fly. Doing this with current keeps timing errors (phase shift) very low, so the amplifier behaves consistently and confidently even into difficult speaker loads. In listening terms, you get wide bandwidth, clarity, and stability.
What does a damping factor of 1000 mean in practice?
Damping factor describes how firmly the amplifier grips and controls the speaker's woofer, and 1000 is a very high, very confident figure. When a woofer cone moves to make bass, it tends to keep vibrating slightly after the note should stop. A high damping factor means the amplifier reins in that motion tightly, so bass sounds taut, tuneful, and controlled rather than loose or boomy. Accuphase achieves this by using several output devices in parallel per channel to lower impedance and raise this grip.
Sound Quality and Measurements
What does the low total harmonic distortion tell me?
Total harmonic distortion measures how much the amplifier adds or changes the original signal, and lower is better, so the E-700's figures are excellent. It measures 0.03 percent into 8 ohms and 0.05 percent into 2 to 4 ohms. These tiny numbers mean the amplifier passes the music through with very little of its own coloration, so what you hear is close to the recording rather than the amplifier's fingerprint.
What does the frequency response figure mean?
Frequency response describes how evenly the amplifier treats low, middle, and high sounds, and the E-700 is remarkably even across the whole audible range. Its response runs from 20 Hz (deep bass) to 20 kHz (high treble) with a variation of only +0 to -0.2 dB. That vanishingly small variation means no part of the music is exaggerated or held back, giving a natural, balanced tonal character.
Features, Controls, and Connections
What do the analog power meters show?
The two needle meters on the front panel show how much power the amplifier is delivering to your speakers in real time. They read on a logarithmic scale, which simply means they can show both very small and very large amounts of power in a readable way. Beyond being genuinely useful for seeing how hard the amplifier is working, they are a beloved Accuphase signature that many owners find calming and beautiful to watch as they listen.
What convenience controls does the E-700 offer?
The E-700 includes tone controls, loudness compensation, and input level matching, all handled cleanly so they do not compromise the sound when switched out. Tone controls let you gently adjust bass and treble to taste or to suit your room. Loudness compensation helps music sound full and balanced when you listen at low volumes, where our ears naturally hear less bass. Input level matching lets you balance the loudness of different sources so switching between them does not cause a jarring jump in volume.
What are balanced inputs and why do they matter?
Balanced inputs are a type of connection (using XLR plugs) designed to reject noise that a cable might pick up along the way. The E-700 uses an instrumentation-amplifier arrangement on these inputs, which is a clever circuit that cancels out interference common to both wires in the cable. This is especially helpful with longer cable runs or in electrically noisy environments, keeping your music clean.
Can the E-700 be upgraded later with option boards?
Yes, the E-700 has option slots that accept plug-in boards, so you can add capabilities when you need them. For example, you can fit a DAC board to add digital inputs (a DAC, or digital-to-analog converter, turns computer or streamer data into music), or an analog board, or a phono board to connect a turntable. This modular approach means the amplifier can grow with your system rather than being fixed at the moment you buy it.
Build Quality and Who It Suits
Why does Accuphase build quality matter?
Accuphase build quality matters because the amplifier's physical solidity directly protects the delicate music signal from vibration and electrical noise. The E-700 uses a thick machined-aluminum front panel with the signature hairline finish, a heavy high-rigidity chassis, large low-noise power transformers, big filter capacitors, and gold-plated connectors. At 24.9 kg (with dimensions of 465 x 191 x 428 mm), it feels reassuringly substantial. That mass and careful internal layout fight the vibration and noise that blur sound, which is why these amplifiers measure so well, feel so satisfying to use, and reliably last for decades.
How much electricity does the E-700 use?
Because it is a Pure Class-A design, the E-700 draws 178 W at idle and up to 290 W at maximum, meaning it uses meaningful power even when playing quietly. This is normal and expected for Class-A, where the transistors stay fully active at all times to deliver that smooth sound. It simply means the amplifier runs warm, so it appreciates a little breathing room for air to circulate around it.
Who is the Accuphase E-700 for?
The E-700 is for the listener who wants the smoothness and purity of Pure Class-A sound in a single, beautifully made, upgradeable box. It suits someone building a serious system who values tonal refinement, quiet backgrounds, and firm bass control over sheer wattage, and who appreciates equipment that will serve faithfully for many years. If you are new to high-end audio and want one component that gets so much right, controls your sources, drives your speakers, and can grow with you, the E-700 is a wonderfully welcoming place to begin.