Accuphase E-800S Integrated Amplifier
Accuphase E-800S Class A Balanced Integrated Stereo Amplifier The flagship of Accuphase's integrated amplifier line, the E-800S represents everything the company has learned across five decades of precision amplifier engineering, distilled into a single chassis. What the E-800S Is and Why It Matters There are integrated amplifiers, and then there is the Accuphase E-800S. Accuphase describes it plainly as simply the world's best integrated amplifier, and after examining its architecture from input stage to output terminals, it is a claim that is difficult to dispute. The E-800S is a fully balanced, pure Class A integrated amplifier rated at 50 watts per channel into 8 ohms, doubling cleanly to 100 watts into 4 ohms and again to 200 watts into 2 ohms. That doubling behavior is not marketing language; it is the signature of a properly designed, robust power supply and a circuit topology that handles real-world loudspeaker loads with complete authority. For listeners with demanding, low-sensitivity, or low-impedance speakers, the E-800S does not merely cope with the load. It commands it. The amplifier sits at the top of the Accuphase integrated amplifier range, above the E-480 and the E-700, and it shares DNA with Accuphase's separate preamplifier and power amplifier designs. Choosing the E-800S means choosing the engineering philosophy that runs through the C-3900 preamplifier and the A-75 power amplifier, unified into a single, beautifully engineered instrument that eliminates interconnect coloration between preamp and power sections entirely. Balanced AAVA: Rethinking the Volume Control Every serious integrated amplifier must solve the same fundamental problem: how do you control volume without degrading the signal? Conventional designs use a variable resistor, a potentiometer, and while that approach works, it introduces contact resistance that changes with position, channel tracking errors at low volumes, and a noise floor that is never quite as low as it could be. The Balanced AAVA (Accuphase Analog Vari-gain Amplifier) circuit in the E-800S abandons the potentiometer entirely. Rather than attenuating the signal with a resistive element, AAVA generates multiple weighted copies of the input signal and selects among them mathematically, changing the combination of those copies to vary gain. The result is a volume control that operates silently at every position, tracks perfectly between channels, and contributes no noise of its own. The E-800S takes this further with a fully balanced implementation of AAVA, reducing overall noise by approximately 10 percent compared to earlier AAVA designs at typical listening volumes. The physical volume control reinforces this engineering discipline. The sensor mechanism is machined from a single block of aluminum, providing the precise, weighted feel that audiophiles associate with the finest Japanese instruments. When the volume is adjusted via the supplied RC-250 remote commander, the mechanism operates so quietly that mechanical noise is effectively inaudible. This is not accidental. It is the product of the same obsessive attention to detail that defines every other aspect of the E-800S. ANCC and the Pursuit of Vanishing Distortion Even the finest amplifier circuits produce some residual noise and distortion during the current-to-voltage conversion stage. Accuphase addresses this with ANCC, the Accuphase Noise and Distortion Canceling Circuit. The principle is elegant: a secondary amplifier, running in parallel with the main amplification stage, monitors the output for noise and distortion and generates a cancellation signal that is fed back into the circuit. The secondary amplifier used in the E-800S employs a low-noise device with a noise density of 1.5 nanovolts per root hertz, chosen specifically because any noise introduced by the cancellation circuit itself would defeat the purpose. The practical benefit is most audible at the transition between low volume settings and typical listening levels, where many amplifiers reveal a floor of low-level noise that obscures fine musical detail. With ANCC engaged, that floor drops measurably. The result is a quieter, blacker background against which the music emerges with greater clarity and dimensionality. The Power Amplification Stage: Instrumentation Amplifier Architecture The power amplification section of the E-800S draws its topology from laboratory instrumentation amplifier design, a circuit configuration chosen in scientific instruments precisely because it rejects common-mode noise with exceptional efficiency. In a standard audio power amplifier, any noise or interference present equally on both the positive and negative signal paths can find its way into the output. The instrumentation amplifier topology used in the E-800S presents equal impedance on both the positive and negative signal paths, which means that any interference common to both paths cancels rather than amplifies. For the listener, this translates to a signal path that is fundamentally more immune to electromagnetic interference and ground noise than a conventional design. Driving this architecture are 12 power MOS-FET devices per channel, arranged in a six-fold parallel push-pull configuration and operated entirely in Class A. Class A operation means that every output device conducts current at all times during the audio cycle, eliminating the crossover distortion that is inherent to Class AB designs at any point where the signal crosses zero. The cost of Class A is heat and power consumption; the E-800S draws 190 watts at idle. The benefit is a particular linearity and smoothness in the midrange and treble that experienced listeners identify immediately and that measurements confirm. The damping factor, a measure of the amplifier's ability to control speaker cone motion, is rated at 1,000, a figure that ensures the E-800S imposes its will on the speaker rather than the other way around. This is particularly relevant with large, multi-driver loudspeakers whose bass performance is highly sensitive to the output impedance of the driving amplifier. Power Supply: The Foundation of Everything No amplifier circuit performs better than the power supply feeding it allows. Accuphase understands this at an engineering level that goes well beyond the selection of a large transformer. The E-800S is built around a massive high-efficiency toroidal transformer, chosen because toroidal geometry concentrates the magnetic field within the core, drastically reducing the electromagnetic interference that a conventional EI-core transformer radiates into the surrounding circuitry. The transformer feeds a bank of filter capacitors totaling 63,000 microfarads at 63 volts per side, providing a reservoir of energy deep enough to supply instantaneous current demands far in excess of the amplifier's rated output. This is why the E-800S can deliver 300 watts per channel into a 1-ohm load on music signal peaks. The speaker sees what the music demands of it, not what the power supply is capable of providing at that moment. Protection for the output stage and the connected loudspeakers is handled by MOS-FET switches rather than conventional relays. MOS-FET switches respond faster, introduce no mechanical contact resistance, and do not wear over time the way relay contacts do, providing protection that is both more reliable and more transparent. Expandability: Building the System You Want The E-800S is designed to grow with its owner's system. The rear panel features two expansion slots that accept Accuphase option boards, allowing the amplifier to be configured precisely for each listener's source components. The DAC-60 digital-to-analog converter board accommodates USB, optical, and coaxial digital inputs, supporting PCM up to 384 kHz via USB and DSD at up to 11.2 MHz via USB in ASIO mode, using a pair of ES9016K2M converters from ESS Technology operated in parallel for enhanced performance. The AD-60 phono equalizer board supports both MC and MM cartridges, with four selectable MC loading impedances of 30, 100, 200, and 300 ohms, a subsonic filter, and 66 dB of gain for the most demanding low-output MC cartridges. A LINE-10 board adds an additional set of unbalanced line inputs for those with expanded source libraries. With two slots available, a listener might pair the AD-60 for vinyl playback with the DAC-60 for digital sources, creating a system of extraordinary versatility within a single chassis. The front panel offers a level of operational sophistication to match the internal engineering. Tone controls using summing active filter topology provide bass adjustment at 300 Hz and treble adjustment at 3 kHz, each with a range of plus or minus 10 dB. A loudness compensator adds 6 dB at 100 Hz for low-volume listening. Individual polarity inversion per input allows the listener to correct for recordings made with inverted absolute phase. A mono switch, a recorder selector, a 20 dB attenuator for instant level reduction, and a speaker A/B output selector round out a feature set that is genuinely comprehensive without ever feeling crowded or confusing in use. How the E-800S Differs from the E-700 Listeners comparing the E-800S to the E-700, Accuphase's previous flagship integrated amplifier, will find that the E-800S advances the design in several meaningful ways. The E-800S implements the fully balanced AAVA volume control, extending the balanced architecture from input to output in a way that reduces noise by approximately 10 percent at typical listening volumes compared to earlier implementations. The ANCC noise and distortion canceling circuit is present in the E-800S and provides measurably improved performance at the I-V conversion stage. The power output of the E-800S is higher, and its rated damping factor of 1,000 represents an extraordinary degree of loudspeaker control. Both amplifiers share the core Accuphase philosophy of Class A operation, MOS-FET output devices, and premium Japanese construction, but the E-800S represents the current state of the art in what Accuphase believes an integrated amplifier can achieve. Construction and Presentation The E-800S arrives in the visual language that has defined Accuphase instruments for decades: a champagne gold faceplate of exceptional quality, bar graph power meters capable of displaying output levels down to negative 50 dB, and a front panel layout that places every control precisely where a listener expects to find it. The chassis is supported on high-carbon cast iron insulators, a material chosen for its exceptional internal damping of vibration. At 35.7 kilograms net weight and 465 by 239 by 502 millimeters, the E-800S commands a dedicated equipment rack position. It is not a component that will be overlooked in any system. Key Specifications Rated Output Power (both channels driven, 20 to 20,000 Hz)8-ohm load: 50 W/ch4-ohm load: 100 W/ch2-ohm load: 200 W/ch1-ohm load (music signals): 300 W/ch Total Harmonic Distortion (rated output, 20 to 20,000 Hz)4 to 16-ohm load: 0.03%2-ohm load: 0.05% Intermodulation Distortion: 0.01% Frequency Response at Rated OutputBalanced/Line Input: 20 to 20,000 Hz (+0, -0.5 dB)Main In Balanced/Line: 20 to 20,000 Hz (+0, -0.2 dB) Frequency Response at 1 W OutputMain In Balanced/Line: 3 to 150,000 Hz (+0, -3.0 dB) Damping Factor: 1,000 (guaranteed) Input Sensitivity at Rated OutputInput Balanced/Line: 100 mVMain In Balanced/Line: 796 mV Input ImpedanceInput Balanced: 40 kilohmsInput Line: 20 kilohmsMain In Balanced: 40 kilohmsMain In Line: 20 kilohms Maximum Input Voltage: 5.0 V Output Impedance (Preamplifier Output): 50 ohms GainInput to Pre Output: 18 dBMain In to Speaker Output: 28 dB S/N Ratio at Rated Output (A-weighted)Input Balanced/Line: 105 dBMain In Balanced/Line: 120 dB Tone ControlsBass: 300 Hz, plus or minus 10 dBTreble: 3 kHz, plus or minus 10 dB Loudness Compensator: +6 dB at 100 Hz Attenuator: -20 dB Headphone Output: Compatible with 8 ohms or higher impedance Power Meters: 30-point bar graph, displays to -50 dB, with on/off switch Power Requirements: 120 V / 220 V / 230 V AC, 50/60 Hz Power ConsumptionIdle: 190 WPer IEC 62368-1: 260 WStandby: 0.3 W Dimensions: 465 mm W x 239 mm H x 502 mm D (18.3" x 9.4" x 19.8") Weight: 35.7 kg net (78.7 lbs); 45 kg shipping (100 lbs) Inputs: 5 unbalanced line inputs, 3 balanced inputs, 2 option board slots (DAC-60, AD-60, or LINE-10 sold separately) Outputs: 2 sets of speaker terminals (A/B), balanced preamplifier output, unbalanced preamplifier output, headphone jack, recorder output Included Accessories: RC-250 remote commander, 2-meter AC power cord Warranty: Contact All Elite Audio for current Accuphase warranty terms Price: Contact All Elite Audio for current pricing Why Buy From All Elite Audio All Elite Audio is an authorized Accuphase dealer, which means every E-800S we sell comes with full factory warranty coverage, legitimate serial number registration, and the assurance that you are receiving a genuine product supported by Accuphase's standards. We carry the full Accuphase integrated amplifier lineup and can help you evaluate the E-800S in the context of your specific speakers, source components, and room. We invite you to call, text, or visit us to discuss the E-800S and hear what it does in a properly assembled system. Call: 443-402-5055Text: 443-402-5064Visit: 1921 York Rd, Timonium, MD 21093 Frequently Asked Questions Does the Accuphase E-800S have a built-in phono stage for playing vinyl records? The E-800S does not include a phono stage as standard equipment, but Accuphase has designed the amplifier specifically to accept one. The rear panel features two option board expansion slots, and one of the available boards is the AD-60 analog record input board, which provides a full-featured phono equalizer supporting both MC and MM cartridges. For MC cartridges, the AD-60 offers four selectable loading impedances of 30, 100, 200, and 300 ohms and 66 dB of gain, making it compatible with even the lowest-output MC designs on the market. It also includes a subsonic filter to attenuate low-frequency rumble from turntable bearings. The AD-60 is a premium add-on and is available separately; we at All Elite Audio can advise you on whether the AD-60 is the right choice for your cartridge and turntable combination. Does the E-800S include a DAC for digital sources such as streaming or CD players? The E-800S does not include a built-in DAC as part of its standard configuration, but like the phono stage, digital conversion is available as an option board upgrade. The DAC-60 board installs in one of the two rear-panel expansion slots and accepts USB, optical, and coaxial digital inputs. Via USB, it supports PCM at sampling rates from 32 kHz up to 384 kHz and DSD at up to 11.2 MHz when used with ASIO drivers. The DAC-60 uses two ESS Technology ES9016K2M converters operated in parallel, a configuration that improves noise performance compared to a single-chip implementation. If you are building a system around a streamer, computer audio source, or CD transport, the DAC-60 transforms the E-800S into a complete digital-ready integrated amplifier of exceptional quality. How does the E-800S compare to the Accuphase E-700? The E-800S is the current flagship of the Accuphase integrated amplifier line and supersedes the E-700 as the definitive statement of what Accuphase believes an integrated amplifier can accomplish. The most significant architectural advancement in the E-800S is the fully balanced implementation of the AAVA volume control, which reduces noise by approximately 10 percent compared to earlier AAVA designs at typical listening volumes by extending the balanced signal path through the volume stage itself. The E-800S also incorporates the ANCC noise and distortion canceling circuit at the I-V conversion stage, a technology that actively reduces residual noise and distortion through cancellation rather than passive filtering. Power output is higher in the E-800S, and its damping factor of 1,000 exceeds that of the E-700. Both amplifiers are Class A designs built to Accuphase's exacting standards, but the E-800S represents a meaningful step forward in measured performance and listening experience. What does Class A operation actually mean, and why does it matter? In a Class A amplifier, the output transistors or tubes are biased so that they conduct current continuously throughout the entire audio cycle, including the portion where the signal crosses zero volts. In a Class AB amplifier, which describes the vast majority of integrated amplifiers on the market, the output devices share responsibility for the positive and negative portions of the signal, and there is a brief transition period at the zero-crossing point where one device hands off to the other. This handoff introduces a type of distortion called crossover distortion, which occurs at low signal levels and is one of the reasons that some Class AB amplifiers can sound slightly grainy or harsh on fine musical details. Class A operation eliminates crossover distortion entirely because there is no handoff. The cost of this design philosophy is significant power consumption at idle, the E-800S draws 190 watts even with no signal present, because the output devices are always conducting. The sonic benefit is a particular smoothness, coherence, and naturalness that experienced listeners associate with the finest amplifier designs regardless of topology. What is the Balanced AAVA volume control and why is it superior to a conventional potentiometer? A conventional volume control is a potentiometer, essentially a variable resistor that reduces the signal by routing a portion of it to ground. Potentiometers wear over time, introduce channel-tracking errors at low volume settings, and add a noise contribution that varies with the wiper position. The AAVA system used in the E-800S works on an entirely different principle. The input signal is converted into multiple weighted copies of itself, and the volume level is set by selecting and summing the appropriate combination of those copies. There is no variable resistor in the signal path, no wiper contact, and no mechanism for noise to be introduced by the volume control itself. The fully balanced implementation in the E-800S extends this concept across a fully differential signal path, reducing the noise floor further at typical listening volumes. The practical result is a volume control that contributes essentially nothing to the noise floor and tracks with perfect channel balance at any setting, from the quietest late-night listening level to full volume. What is the damping factor of 1,000, and what does that mean for my speakers? The damping factor of an amplifier describes how effectively it can control the motion of a loudspeaker's driver cone after the electrical signal that drove it has ended. A speaker driver is essentially a mass on a spring, and when current stops flowing through the voice coil, the driver continues to move due to inertia. The amplifier damps this residual motion by presenting a very low output impedance relative to the speaker's own impedance. A damping factor of 1,000 means that the amplifier's output impedance is 1,000 times lower than the nominal speaker impedance, an extremely high figure that gives the E-800S an extraordinary degree of control over speaker motion. The audible benefit is most obvious in the bass, where tight, well-controlled driver behavior translates directly into better defined, more articulate low frequencies. With bass-heavy program material and demanding loudspeakers, the difference between an amplifier with a damping factor of 100 and one with a damping factor of 1,000 is not subtle. Can the E-800S be used as a preamplifier only, or as a power amplifier only? Yes, the E-800S supports both configurations. The rear panel provides separate preamplifier output connectors, both balanced and unbalanced, allowing the preamp section to drive an external power amplifier directly. Similarly, the MAIN IN inputs, available in both balanced and unbalanced configurations, allow the power amplifier section to be driven by an external preamplifier while bypassing the E-800S's own preamp section. This flexibility makes the E-800S a versatile component in complex systems, and it also supports bi-amping configurations when paired with an additional Accuphase power amplifier, allowing the high-frequency and low-frequency sections of compatible loudspeakers to be driven by separate amplifier channels for potentially improved performance. How difficult is it to install option boards in the E-800S? Accuphase has designed the option board system to be owner-installable with basic care and attention. The rear panel features clearly marked expansion slots that accept the DAC-60, AD-60, and LINE-10 boards, and the installation process involves removing the slot covers and carefully seating the board in the connector. We recommend allowing us at All Elite Audio to assist with option board installation if you are not comfortable working with sensitive electronics, particularly because the E-800S is a significant investment and the interior should be treated accordingly. We can install option boards at the time of purchase or at any later point during a service visit, and we can ensure that the boards are properly configured for your specific source components and cartridge. Where is the best place to buy the Accuphase E-800S? The best place to purchase the Accuphase E-800S is from an authorized Accuphase dealer, and All Elite Audio is proud to carry that authorization. Purchasing from an authorized dealer is essential with an amplifier of this caliber because it ensures that your unit is covered by the full manufacturer warranty, that it is a genuine product properly configured for your region's voltage, and that you have access to knowledgeable support from people who understand the product and the broader system context it will live in. We can discuss pricing, answer any remaining technical questions, and work with you to configure the E-800S with the appropriate option boards for your system. Visit us at 1921 York Rd in Timonium, Maryland, call us at 443-402-5055, or text us at 443-402-5064. We welcome the conversation.
