Onkyo TX-8555: Elevating Audio Excellence


In today’s world of advanced technology and digital audio, the importance of high-quality sound amplification cannot be overstated. Whether you are an avid music lover, a movie enthusiast, or a gamer seeking immersive audio experiences, having a reliable and powerful amplifier is essential. In this review, we will delve into the world of hifi sound amplification and explore the features and performance of the Onkyo TX-8555 amplifier.

The Onkyo TX-8555 is a stereo receiver designed for those who appreciate the benefits of time-tested amplifier constructions. It combines Onkyo’s key technologies with a set of essential features to deliver an uncompromising stereo receiver that offers audio and radio with remarkable quality. With its robust power supply and isolated input circuits, this amplifier ensures that the signal is amplified without compromising its quality. The power to drive speakers is drawn from the power supply through powerful output stages.

While advancements in flat-panel televisions and high-definition video have revolutionized the visual experience, stereo sound still plays a significant role in our lives. The Onkyo TX-8555 allows you to focus on the sound quality in music, movies, and even games. It is equipped with unique Onkyo technology and housed in a reinforced chassis that eliminates possible vibrations. Whether you are listening to your iPod, satellite radio, CD discs, or other traditional audio sources, the TX-8555 faithfully reproduces music with detailed precision and impressive sound pressure.

Furthermore, this amplifier offers the convenience of Zone 2 functionality, allowing you to listen to music in another room. With 125 watts per channel at 4 ohms and Wide Range Amplifier Technology (WRAT), it delivers high output currents for low impedance loads. The discrete output stages ensure optimal performance while the massive power transformer ensures stable power supply. Additionally, it features multiple audio and A/V inputs and outputs, including a phono input for turntables, a preamp output for Zone 2, and an IR input and output for remote control convenience.

In the next sections of this review, we will explore the technical specifications, design and construction, functionality, sound characteristics, sound performance, advantages, value for money, and conclude with our final thoughts on the Onkyo TX-8555 amplifier. So let’s dive in and discover what this amplifier has to offer in terms of audio excellence.

Technical Specifications

The Onkyo TX-8555 amplifier is a stereo receiver designed to deliver high-quality audio performance. With its impressive technical specifications, this amplifier is sure to meet the needs of discerning audio enthusiasts.

Featuring a power output of 125 watts per channel at 4 ohms and a frequency response that spans from 10 Hz to 100 kHz, the TX-8555 is capable of delivering robust and detailed sound reproduction across a wide range of frequencies. This amplifier utilizes the Wide Range Amplifier Technology (WRAT), ensuring accurate and dynamic amplification for an immersive listening experience.

When it comes to sound quality, the TX-8555 excels with its impressive signal-to-noise ratio (SNR) of 100 dB. This means that the amplifier produces minimal background noise, allowing your music to shine through with clarity and precision. Additionally, the total harmonic distortion (THD) is kept at a low 0.08%, ensuring faithful reproduction of audio without any audible distortions.

In terms of connectivity options, the TX-8555 offers versatile input and output capabilities. It features two audio inputs and four A/V inputs, allowing you to connect multiple audio sources such as CD players, media players, or gaming consoles. The inclusion of a phono input also enables you to connect a turntable directly to the amplifier. For output flexibility, there is an audio output along with a preamp output for Zone 2 and a subwoofer output for enhanced bass performance.

The amplifier supports a variety of audio formats, making it compatible with different types of media players or streaming devices. Whether you prefer listening to traditional CDs or streaming music from your iPod via the RI dock compatibility, the TX-8555 has got you covered.

With its solid construction and attention to detail, the TX-8555 is built to last. Its robust design includes a massive power transformer and discrete output stages that ensure stable and reliable performance. The front panel, made from brushed aluminum, adds a touch of elegance to the overall aesthetic.

In summary, the Onkyo TX-8555 amplifier offers impressive technical specifications that contribute to its outstanding audio performance. With its powerful output, low distortion, and versatile connectivity options, this amplifier is a solid choice for audiophiles seeking a high-quality stereo receiver.

Design and Construction

The Onkyo TX-8555 amplifier boasts a sleek and stylish design that will complement any audio setup. Its exterior features a clean and minimalist aesthetic, with a front panel made of brushed aluminum that exudes a sense of sophistication. The use of high-quality materials not only enhances its visual appeal but also ensures durability and longevity.

In terms of construction, Onkyo has paid great attention to detail. The amplifier is built with precision and craftsmanship, resulting in a solid and robust unit. This sturdy construction helps to minimize vibrations and unwanted resonance, allowing for a cleaner and more accurate sound reproduction.

One notable design feature of the TX-8555 is its efficient cooling system. The amplifier is equipped with strategically placed ventilation slots and a well-designed heat sink, which effectively dissipates heat generated during operation. This ensures that the amplifier remains cool even during prolonged use, preventing overheating and potential damage to the internal components.

Furthermore, Onkyo has taken measures to reduce interference and maintain signal integrity. The connectors and switches on the amplifier are of high quality, providing a secure and reliable connection. These components are designed to minimize signal loss and maximize conductivity, resulting in optimal audio performance.

Overall, the design and construction of the Onkyo TX-8555 amplifier showcase both form and function. Its sleek appearance, durable build quality, efficient cooling system, and high-quality connectors contribute to an exceptional user experience. Whether it’s for casual listening or professional use, this amplifier is sure to impress with its attention to detail and commitment to delivering superior audio performance.


The Onkyo TX-8555 amplifier offers a wide range of functionality, making it a versatile option for audio enthusiasts. It provides various connectivity options, allowing you to connect different audio sources such as CD players, computers, smartphones, and more. With its multiple audio and A/V inputs, you can easily switch between different devices and enjoy your favorite music from various sources.

One notable feature of the TX-8555 is the availability of balance controls and tone adjustments. This allows you to fine-tune the sound according to your preferences, ensuring an optimal listening experience. Whether you prefer a more bass-heavy sound or a brighter tone, the amplifier gives you the flexibility to adjust the audio output to suit your personal taste.

Additionally, this amplifier offers different operating modes that enhance its functionality. The Pure Audio mode is particularly noteworthy as it allows for a purer and cleaner audio playback by disabling unnecessary circuitry that may introduce interference or distortion. This mode is perfect for audiophiles who prioritize high-fidelity sound reproduction.

Furthermore, the TX-8555 also features a headphone output, allowing you to enjoy your music privately without disturbing others. This is especially convenient when you want to immerse yourself in your favorite tracks without any distractions.

Overall, the functionality of the Onkyo TX-8555 amplifier is impressive. It provides a wide range of connectivity options for various audio sources and offers convenient controls and operating modes for personalized sound adjustments. Whether you are using it with traditional audio devices or modern digital sources, this amplifier ensures a seamless and enjoyable listening experience.

Sound Characteristics

The Onkyo TX-8555 amplifier offers exceptional sound characteristics that will impress even the most discerning audiophiles. This amplifier delivers a rich and detailed sound quality, allowing you to fully immerse yourself in your favorite music.

One notable aspect of the sound quality is the impressive instrument separation. Each instrument in the audio mix is distinct and well-defined, creating a truly immersive listening experience. Whether you’re listening to a symphony orchestra or a rock band, you’ll be able to hear every instrument with clarity and precision.

The bass response of the Onkyo TX-8555 is powerful and tight, adding depth and impact to your music. Whether it’s the deep rumble of a bass guitar or the pounding beats of electronic music, this amplifier reproduces low frequencies with accuracy and authority.

The treble clarity is another standout feature of this amplifier. High-frequency sounds are reproduced with exceptional detail and sparkle, adding brilliance to vocals, cymbals, and other high-pitched instruments. The overall sound presentation is balanced and natural, ensuring that no aspect of the audio spectrum overpowers the others.

When it comes to different music genres, the Onkyo TX-8555 excels in delivering an authentic sound experience across all genres. From classical compositions to jazz improvisations, every nuance and subtlety of the music is faithfully reproduced. Rock and pop music benefit from the amplifier’s dynamic range, allowing for impactful guitar riffs and energetic drum beats. Even electronic music genres benefit from the amplifier’s ability to reproduce deep bass lines and intricate synth melodies.

Overall, the sound characteristics of the Onkyo TX-8555 amplifier are impressive. It offers a detailed soundstage with excellent instrument separation, powerful bass response, clear treble clarity, and a balanced overall sound presentation. Regardless of your preferred music genre, this amplifier will enhance your listening experience and bring your favorite tracks to life.

Sound Performance

The Onkyo TX-8555 amplifier delivers an exceptional sound performance that will transport you into a captivating auditory experience. With its advanced technology and precision engineering, this amplifier faithfully reproduces audio signals with remarkable clarity, dynamics, and tonal balance across the entire frequency range.

When it comes to clarity, the TX-8555 truly shines. It effortlessly brings out the intricate details in your music, allowing you to hear every note and nuance with stunning precision. Whether you’re listening to delicate acoustic melodies or powerful rock anthems, this amplifier ensures that each instrument and vocal is reproduced with exceptional clarity and definition.

The dynamics of the sound produced by the TX-8555 are nothing short of impressive. It effortlessly handles both soft and loud passages, delivering a wide dynamic range that adds depth and excitement to your listening experience. From the gentlest whisper to the thunderous crescendos, this amplifier captures every moment with incredible accuracy and impact.

One of the standout features of the TX-8555 is its impeccable tonal balance. It ensures that no frequency range is overemphasized or neglected, resulting in a well-balanced sound that is pleasing to the ears. The lows are deep and punchy, while the mids are rich and vibrant. The highs are crisp and detailed without being harsh or fatiguing. This balanced reproduction allows you to fully immerse yourself in your favorite music genres, whether it’s jazz, classical, rock, or electronic.

Furthermore, this amplifier excels at handling different types of audio sources. Whether you’re playing vinyl records through its phono input or streaming music from your smartphone via its A/V inputs, the TX-8555 maintains its exceptional sound quality throughout. It ensures that every source is treated with equal care and attention, providing a consistent level of audio excellence across all your listening experiences.

In conclusion, the Onkyo TX-8555 amplifier offers a sound performance that is truly captivating. Its ability to faithfully reproduce audio signals with clarity, dynamics, and tonal balance makes it a standout choice for audiophiles and music enthusiasts alike. Regardless of the genre or source, this amplifier delivers an immersive and enjoyable listening experience that will leave you wanting more.


The Onkyo TX-8555 amplifier offers several advantages that set it apart from its competitors in the market. Firstly, its wide range amplifier technology (WRAT) ensures high-quality audio performance with minimal distortion. This technology allows for a more accurate and detailed sound reproduction, providing an immersive listening experience.

Another advantage of the TX-8555 is its powerful output, delivering 125 watts per channel at 4 ohms, allowing for a robust and dynamic sound output. This makes it suitable for various types of speakers and ensures that the amplifier can handle low impedance loads without compromising on sound quality.

The amplifier also features a solid and durable construction, with a reinforced chassis that minimizes vibrations and enhances audio clarity. The front panel is made of brushed aluminum, giving it a sleek and modern appearance that will complement any home entertainment setup.

In terms of functionality, the TX-8555 offers a versatile range of inputs and outputs. It includes two audio and four A/V inputs, allowing for easy connectivity to multiple audio sources such as CD players, iPods, satellite radios, and more. Additionally, it features a phono input for connecting a turntable, making it suitable for vinyl enthusiasts.

One notable advantage of the TX-8555 is its ability to support Zone 2 functionality. This means that you can listen to music in another room while still enjoying different audio sources in the main listening area. This feature adds flexibility to your audio setup and allows you to create a multi-room audio system without the need for additional equipment.

When comparing the Onkyo TX-8555 with other amplifiers in the same price range, it stands out due to its exceptional build quality, powerful performance, and comprehensive set of features. Its combination of high power output, wide range amplifier technology, and versatile connectivity options make it an excellent choice for audiophiles who value both quality and convenience.

Overall, the Onkyo TX-8555 amplifier offers a range of advantages that make it a standout option in its category. Its superior audio performance, solid construction, and versatile functionality make it a worthwhile investment for those seeking a high-quality stereo amplifier that delivers exceptional sound reproduction and value for money.

Value for Money

The Onkyo TX-8555 amplifier offers exceptional value for money with its impressive performance, extensive features, and reasonable price point. This amplifier provides a high-quality audio experience that rivals more expensive options on the market.

In terms of performance, the TX-8555 delivers powerful and clear sound reproduction with its 125W per channel output. The wide range amplifier technology ensures accurate and detailed audio across various genres and sources. With low impedance loads and high output currents, this amplifier can effortlessly drive even demanding speakers.

The TX-8555 boasts a comprehensive set of features that enhance its versatility. It includes multiple audio and A/V inputs, allowing you to connect various devices such as CD players, iPods, or satellite radios. The presence of a phono input is a great addition for vinyl enthusiasts. Additionally, the amplifier offers outputs for Zone 2, enabling you to enjoy music in another room.

Considering its price range, the build quality and design of the TX-8555 are commendable. The reinforced chassis minimizes vibrations, ensuring optimal audio performance. The front panel’s brushed aluminum finish adds a touch of elegance to the overall aesthetic.

When comparing the features and performance of the Onkyo TX-8555 to other amplifiers in a similar price range, it becomes clear that it offers excellent value for money. Its combination of power, functionality, and audio fidelity at an affordable price make it an attractive option for both audiophiles and casual listeners alike.

Whether you are a music lover seeking high-quality sound or a movie enthusiast looking to enhance your home theater setup, the Onkyo TX-8555 amplifier delivers exceptional value for money. Its performance and features rival more expensive options on the market without breaking the bank.

In conclusion, if you are in search of an amplifier that offers outstanding performance, versatile functionality, and affordability, the Onkyo TX-8555 is an excellent choice. Its value for money proposition makes it a compelling option in the market, providing you with a remarkable audio experience without compromising on quality.


In conclusion, the Onkyo TX-8555 amplifier is a remarkable piece of audio equipment that delivers exceptional performance and versatility. With its robust construction and advanced features, this stereo receiver is built to stand the test of time.

The technical specifications of the TX-8555 are impressive, with a signal-to-noise ratio of 100 dB and a low distortion rate of 0.08%. It also offers 2 channels of amplification and a headphone output for personal listening.

The design and construction of the TX-8555 reflect Onkyo’s commitment to quality. The reinforced chassis minimizes vibrations, ensuring clean and accurate sound reproduction. The front panel is made of brushed aluminum, adding a touch of elegance to its appearance.

Functionality is a key aspect of this amplifier, as it boasts multiple audio and video inputs, including a phono input for turntables. The presence of Zone 2 allows users to enjoy music in another room, providing added convenience and flexibility.

When it comes to sound characteristics, the TX-8555 excels in delivering detailed and powerful audio. The Wide Range Amplifier Technology ensures wide frequency response and high output currents, resulting in dynamic and immersive sound reproduction.

In terms of sound performance, the TX-8555 truly shines. Whether you’re listening to music from your iPod, satellite radio, or traditional audio sources like CDs, this amplifier faithfully reproduces every detail with impressive clarity and sonic impact.

One of the major advantages of the Onkyo TX-8555 is its value for money. Considering its exceptional build quality, extensive functionality, and outstanding sound performance, this amplifier offers great bang for your buck.

For potential buyers seeking a reliable and versatile stereo amplifier that delivers excellent audio quality, the Onkyo TX-8555 is an ideal choice. Its solid construction, advanced features, and remarkable sound performance make it a worthwhile investment for audiophiles and music enthusiasts alike.

In conclusion, the Onkyo TX-8555 amplifier is a top-notch audio component that offers a compelling combination of features, design, and performance. Its ability to deliver high-quality sound and its versatility make it a standout choice for anyone in search of a superior stereo receiver.

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