Accuphase E-650: Unleashing Audiophile Excellence


In the world of audio enthusiasts, high-quality sound amplification is paramount. Whether it’s for enjoying music, watching movies, or immersing oneself in the intricacies of a live concert recording, a powerful and precise amplifier is essential. Today, we delve into the realm of premium audio equipment with the Accuphase E-650 amplifier.

The Accuphase E-650 is a stereo integrated amplifier that embodies innovative engineering solutions and utilizes top-notch materials and components. It stands out with its exceptional balanced volume control called AAVA (Accuphase Analog Vari-gain Amplifier) and a triple parallel arrangement of power MOS-FET transistors in the output stage. This amplifier boasts a fully balanced configuration from input to output, thanks to its latest precision amplifier design.

With a robust power supply and a low-impedance output circuit, the Accuphase E-650 delivers an impressive 150 watts per channel (at 1 Ohm with musical signals) and a damping factor of 800. These specifications ensure that this amplifier can handle even the most demanding speakers with ease.

The Accuphase E-650 draws upon years of accumulated expertise in engineering and design to achieve an even higher level of performance. The enhanced AAVA volume control, advanced circuit topology, and meticulously selected components elevate this amplifier to the level of their anniversary models.

This integrated amplifier features a beautifully crafted aluminum volume knob that operates smoothly thanks to its high rigidity sensor and massive brass shaft. The implementation of low impedance circuitry enhances the signal-to-noise ratio significantly, taking the performance and build quality to new heights.

The power amplification section utilizes cutting-edge technology to achieve fully balanced signal transmission throughout. The MCS+ topology combined with current feedback amplification ensures an extremely low output impedance and a damping factor exceeding 800. Power MOS-FET transistors arranged in a triple parallel balanced configuration for each channel enhance the amplifier’s ability to drive low-impedance loads, operating in pure Class A. The output stage is supported by a powerful power supply featuring a large toroidal transformer and high-capacity filtering capacitors.

The Accuphase E-650 not only delivers exceptional audio performance but also offers a range of convenient features. It includes tone and balance controls, defeatable loudness compensation, the ability to connect two pairs of speakers, a high-quality adjustable headphone output, and optional modules for digital-to-analog conversion and MM/MC phono equalization. Additionally, it provides a phase switch for the balanced input signal on the rear panel.

With its captivating design and attention to detail, the Accuphase E-650 is more than just an amplifier; it is a work of art that brings music to life. Inside its chassis, massive heat sinks ensure efficient heat dissipation from the transistors operating in pure Class A. This allows the amplifier to operate with precision and maintain its optimal performance over time.

Now that we have introduced the Accuphase E-650, let us delve into its technical specifications, design and construction, functionality, sound characteristics, sound performance, advantages, value for money proposition, and conclude our review with final thoughts on this exceptional amplifier.

Technical Specifications

The Accuphase E-650 is an integrated stereo amplifier that boasts a range of impressive technical specifications. With a power output of 2×30 watts at 8 ohms and 2×60 watts at 4 ohms, this amplifier delivers ample power to drive a variety of speakers. The amplifier operates in Class A, ensuring high-quality sound reproduction with minimal distortion.

When it comes to sound quality, the Accuphase E-650 excels. With a signal-to-noise ratio (SNR) of 117 dB, it offers exceptional clarity and detail in audio playback. Additionally, the total harmonic distortion (THD) is a mere 0.05%, guaranteeing accurate and faithful reproduction of the original recording.

In terms of connectivity, the Accuphase E-650 provides a range of inputs and outputs to accommodate various audio sources. It features two XLR analog inputs and six RCA line inputs, allowing for seamless integration with different components such as CD players, turntables, or streaming devices. The amplifier also includes one XLR analog output and one RCA line output for connecting to external devices or recording equipment.

The frequency response of the Accuphase E-650 ranges from 20 Hz to 20 kHz, ensuring a wide spectrum of sound reproduction. This amplifier is capable of handling both low and high frequencies with precision and accuracy. With an impedance rating of 800, it can easily drive speakers with various impedance levels.

Overall, the technical specifications of the Accuphase E-650 demonstrate its commitment to delivering exceptional sound quality and versatility in audio playback. Whether you are a discerning audiophile or a casual music lover, this amplifier is designed to meet your needs and exceed your expectations.

Design and Construction

The Accuphase E-650 amplifier boasts a sleek and elegant design that exudes sophistication. Its golden color adds a touch of luxury, making it a visually appealing addition to any audio setup. The construction of the amplifier is top-notch, with high-quality materials and components used throughout.

One notable design feature of the E-650 is its efficient cooling system. The amplifier is equipped with massive radiators, which effectively dissipate heat generated by the transistors operating in pure Class A mode. This ensures that the amplifier can maintain its performance and stability over extended listening sessions.

In terms of reducing interference, Accuphase has implemented careful circuit design and shielding techniques to minimize any unwanted noise or distortion. This attention to detail results in a clean and transparent audio reproduction.

The connectors and switches on the E-650 are of exceptional quality. The gold-plated high-quality acoustic terminals allow for secure and reliable connections with speaker cables. The presence of XLR inputs further enhances the amplifier’s versatility, providing compatibility with balanced audio sources. The switches are sturdy and responsive, giving a reassuring feel when adjusting settings.

Overall, the design and construction of the Accuphase E-650 amplifier are impeccable. Its elegant appearance, thoughtful cooling system, high-quality connectors, and switches all contribute to its premium build quality. This amplifier is a testament to Accuphase’s commitment to excellence in both aesthetics and engineering.


The Accuphase E-650 amplifier offers a wide range of functionality, making it a versatile choice for audio enthusiasts. With its comprehensive connectivity options, this amplifier allows you to easily connect various audio sources such as CD players, computers, smartphones, and more. Whether you want to enjoy your favorite music from a traditional CD or stream songs from your smartphone, the E-650 has got you covered.

In terms of controls, this amplifier provides balance controls and tone adjustments, allowing you to fine-tune the sound according to your preferences. The balance controls ensure that the audio is evenly distributed between the left and right channels, resulting in a balanced and immersive listening experience. Additionally, the tone adjustments enable you to customize the sound by adjusting the bass, treble, and midrange frequencies.

The E-650 also offers other operating modes that enhance its functionality. It features a headphone output on the front panel, allowing you to enjoy your music privately without disturbing others. This is particularly useful when you want to have an intimate listening session or when you don’t have access to speakers.

Moreover, this amplifier includes multiple analog inputs, both XLR and RCA, providing flexibility in connecting different audio devices. Whether you prefer using professional-grade XLR cables or standard RCA cables, the E-650 accommodates both options. Additionally, it features analog outputs for connecting external devices such as power amplifiers or subwoofers.

Overall, the functionality of the Accuphase E-650 amplifier is impressive. It offers a wide range of connectivity options and various operating modes that cater to different audio sources and user preferences. Whether you want to connect your favorite CD player or fine-tune the sound with balance controls and tone adjustments, this amplifier delivers on all fronts.

Sound Characteristics

The Accuphase E-650 amplifier delivers an exceptional sound quality that will captivate any audiophile. The attention to detail in its design and construction translates into a truly immersive audio experience.

One of the standout features of the E-650 is its ability to reproduce intricate details with precision. The amplifier excels at capturing the subtle nuances and textures of instruments, allowing listeners to truly appreciate the depth and complexity of their favorite music. Whether it’s the delicate plucking of guitar strings or the soft breathiness of a vocalist, the E-650 ensures that every note is reproduced with clarity and accuracy.

Instrument separation is another area where the E-650 truly shines. Each instrument is given its own space within the soundstage, creating a sense of depth and dimensionality that enhances the overall listening experience. This level of separation allows listeners to easily distinguish between different instruments, making it feel as though they are sitting in the middle of a live performance.

The bass response of the E-650 is powerful and impactful without overpowering the rest of the audio spectrum. It provides a solid foundation to the music, adding depth and richness to lower frequencies without sacrificing control or accuracy. Whether it’s a deep bassline or thunderous drum beats, the E-650 reproduces them with authority and precision.

On the other end of the spectrum, the treble clarity of the E-650 is remarkable. High-frequency details are rendered with exceptional clarity and transparency, ensuring that no subtlety is lost in the mix. The amplifier maintains a perfect balance between smoothness and detail, resulting in a treble response that is both engaging and fatigue-free.

When it comes to different music genres, the E-650 showcases its versatility by adapting to each genre’s unique characteristics. Whether you’re listening to classical music with its delicate orchestral arrangements, rock music with its energetic guitar riffs, or jazz music with its intricate improvisations, the E-650 faithfully reproduces the essence of each genre. It effortlessly brings out the emotion and dynamics of the music, allowing listeners to fully immerse themselves in the artist’s intended sound.

In summary, the Accuphase E-650 amplifier offers a sound quality that is truly exceptional. Its ability to reproduce intricate details, provide instrument separation, deliver impactful bass, and maintain treble clarity makes it a standout choice for any discerning audiophile. Regardless of the music genre, the E-650 ensures an immersive and engaging listening experience that will leave you wanting more.

Sound Performance

The Accuphase E-650 amplifier delivers a sound performance that is truly captivating and immersive. It has the ability to transport the listener into a world of rich and detailed audio, where every note and nuance is faithfully reproduced.

One of the standout qualities of the E-650 is its exceptional clarity. The amplifier has a remarkable ability to unveil even the subtlest details in the music, allowing the listener to hear every instrument and vocal with incredible precision. The clarity extends across the entire frequency range, from the delicate highs to the powerful lows, ensuring that no aspect of the music is lost or overshadowed.

In terms of dynamics, the E-650 truly shines. It effortlessly handles both soft and loud passages, providing a wide dynamic range that adds depth and excitement to the listening experience. Whether it’s a gentle piano melody or a thunderous drum solo, this amplifier captures every dynamic shift with finesse and accuracy.

Tonal balance is another area where the E-650 excels. The amplifier maintains a perfect equilibrium between different frequencies, ensuring that no part of the audio spectrum overpowers or dominates. The bass is tight and controlled, without being overpowering, while the midrange is warm and natural, allowing vocals to shine through with remarkable clarity. The highs are crisp and well-defined, adding sparkle and airiness to the overall sound.

Furthermore, the E-650’s soundstage is expansive and three-dimensional. It creates a sense of space and depth that makes you feel as if you’re sitting in a live concert hall or studio recording session. Instruments are precisely placed within this soundstage, allowing for an immersive listening experience where you can almost visualize each musician’s position on stage.

Overall, the sound performance of the Accuphase E-650 is nothing short of extraordinary. Its ability to faithfully reproduce audio signals with exceptional clarity, dynamics, and tonal balance makes it a true standout in its class. Whether you’re a casual listener or a dedicated audiophile, this amplifier will elevate your music listening experience to new heights.


The Accuphase E-650 amplifier offers several distinct advantages that set it apart from its competitors in the market. Firstly, its innovative engineering solutions and high-quality materials make it a standout product in terms of build and construction. The use of a superior AAVA volume control and a triple parallel arrangement of power MOS-FET transistors in the output stage ensures exceptional performance and balanced sound reproduction.

In comparison to other models in its price range, the Accuphase E-650 excels in its fully balanced configuration from input to outputs, providing a more immersive and detailed audio experience. The inclusion of the Accuphase Analog Vari-gain Amplifier (AAVA) with a high-stiffness sensor and a smooth-operating control knob further enhances the signal-to-noise ratio, elevating the overall performance and precision.

Furthermore, the amplifier’s power section employs advanced technology and circuitry, resulting in an impressively low output impedance and a damping factor of 800. This allows for better control over low-impedance loads, ensuring accurate sound reproduction across all frequencies.

Another advantage of the Accuphase E-650 is its versatility. With features such as tone and balance controls, switchable fine compensation, dual speaker outputs, a high-quality adjustable headphone output, and optional modules for digital-to-analog conversion and MM/MC phono equalization, this amplifier caters to various audio setups and preferences.

When compared to competing models within its price range, the Accuphase E-650 stands out due to its exceptional build quality, precise sound reproduction capabilities, and extensive functionality. It offers a level of performance that is often found in amplifiers at higher price points, making it an excellent value for money.

Overall, the Accuphase E-650 amplifier offers significant advantages over its competitors. Its superior engineering, balanced design, versatile features, and impressive sound performance make it a top choice for audiophiles seeking a high-end amplifier that delivers exceptional value.

Value for Money

The Accuphase E-650 amplifier offers exceptional value for money, combining top-notch performance, extensive features, and a reasonable price. With its innovative engineering solutions and high-quality materials, this amplifier delivers outstanding audio performance that rivals more expensive options on the market.

In terms of performance, the E-650 boasts a clean and powerful sound with a wide frequency range of 20Hz to 20kHz. The amplifier’s low signal-to-noise ratio of 117dB ensures that the music is reproduced with utmost clarity and detail, allowing you to hear even the subtlest nuances in your favorite tracks. Additionally, the low distortion rate of 0.05% guarantees accurate and faithful sound reproduction.

The E-650 also excels in terms of features. It comes equipped with a comprehensive set of inputs and outputs, including two XLR analog inputs, six RCA line inputs, one balanced input, one XLR analog output, one Jack (6.3) output, and a headphone output. This versatility allows you to connect various audio sources and tailor your listening experience according to your preferences.

Considering its performance capabilities and extensive feature set, the Accuphase E-650 offers excellent value for its price. While it may not be the most affordable amplifier on the market, it provides a level of audio quality that is typically found in higher-priced models. Moreover, its durable construction and reliable components ensure long-term reliability and longevity.

Whether you are an audiophile seeking uncompromising sound quality or a music lover looking for an amplifier that offers both performance and versatility, the Accuphase E-650 delivers exceptional value for money. Its combination of advanced engineering, premium materials, and competitive pricing make it a worthy investment for anyone seeking high-quality audio reproduction.

In conclusion, the Accuphase E-650 amplifier offers outstanding value for money with its impressive performance capabilities, extensive features, and reasonable price point. It is a reliable and versatile choice that will satisfy even the most discerning audiophiles, making it a worthwhile investment for any music enthusiast.


In conclusion, the Accuphase E-650 amplifier is an exceptional piece of audio equipment that delivers outstanding performance and quality. From its innovative engineering solutions to its high-quality materials and components, this amplifier truly stands out in the market.

The E-650 boasts a balanced volume control system called AAVA (Accuphase Analog Vari-gain Amplifier), which enhances the signal-to-noise ratio and provides smooth operation. The power amplifier section utilizes a state-of-the-art configuration, ensuring fully balanced signal transmission throughout. The use of triple parallel power MOS-FET transistors in the output stage further enhances the amplifier’s ability to handle low-impedance loads.

One of the standout features of the E-650 is its sound characteristics. It offers a captivating and immersive listening experience, faithfully reproducing even the most subtle nuances in music. The amplifier’s ability to create a wide soundstage and maintain precise instrument separation adds depth and realism to any audio content.

In terms of sound performance, the Accuphase E-650 delivers impressive power with 150 watts per channel (at 1 Ohm with musical signals) and an impressive damping factor of 800. This ensures tight control over the speakers, resulting in accurate and dynamic sound reproduction across all frequencies.

The E-650 also offers a range of advantages, including its versatile functionality with options for tone and balance control, headphone output, built-in MM/MC phono equalizer module, and digital-analog converter module (optional). The amplifier’s solid construction with massive heat sinks ensures optimal performance and longevity.

Considering its technical specifications, design, functionality, sound characteristics, and overall performance, the Accuphase E-650 offers excellent value for money. While it may be a significant investment for some buyers, it is undoubtedly worth every penny for those seeking uncompromising audio quality and performance.

In conclusion, the Accuphase E-650 amplifier is a top-tier integrated amplifier that combines innovation, precision engineering, and high-quality components to deliver an exceptional audio experience. Whether you are an audiophile or a music enthusiast, this amplifier will elevate your listening sessions to new heights. If you value unparalleled sound quality and are willing to invest in a premium audio system, the Accuphase E-650 is undoubtedly a worthy choice.

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