Yamaha HA-L7A Headphone Amplifier – From the moment the sound is created to the time it reaches the human ear — Yamaha is there. It is the only brand in the world that intimately knows this process, ranging from the manufacture of musical instruments to professional audio equipment. And True Sound, which strives for sound that accurately reproduces even the very thoughts the artist puts into the music and the expressive view intended by the creator as is, allows you to fully immerse yourself in the sound and enter a profound musical experience, feeling as if you were right in the middle of the performance.
DELIVERING THE ULTIMATE TRUE SOUND IN HEADPHONE LISTENING
Yamaha is proud to announce the release of the HA-L7A, our first high-end headphone amplifier—a truly audiophile-level component that strives for the ultimate True Sound in headphone listening—as more and more discerning audio fans themselves search for that ultimate experience. The HA-L7A blends Yamaha’s over 65-year Hi-Fi audio expertise in AV receivers with the True Sound concept, delivering uncompromised sound by incorporating Tonal Balance, Dynamics, and Sound Image to faithfully express the artist’s intent.
We’ve taken our patented Floating and Balanced Power Amplifier technology, and optimised it for headphone amplification, while adopting ESS Technology’s renowned ES9038PRO 32-bit D/A converter for further sonic benefit. In addition, dual toroidal transformers and high rigidity construction have been employed to bring full dynamic range to audio reproduction. To top it all off, we’ve included a SOUND FIELD mode that allows you to select the optimal sound field to match any type of content. This stunning headphone amplifier has been created in response to the ardent desires of headphone enthusiasts, evidenced by its boldly original design and meticulous build quality. It envelops the listener in a universe of sound unique to the HA-L7A and delivers a profound musical experience that is uniquely Yamaha.
YAMAHA TRUE SOUND TRUE SOUND
YAMAHA’S UNIQUE FLOATING AND BALANCED POWER AMPLIFIER TECHNOLOGY, BALANCED TRANSMISSION
For the HA-L7A, Yamaha has worked to completely eliminate noise, crucial in faithful reproduction, so that all sounds — from musical instruments to vocals and dialogue — can be heard without any unnatural colouration or timbral changes. We’ve optimised our patented Floating and Balanced Power Amplifier technology for this headphone amplifier, with four sets of output stage circuits floated from the ground. The headphones can be driven without alternating between balanced and unbalanced configuration, minimising sound quality discrepancies due to different output terminals. Moreover, all circuitry is completely independent of the ground, cancelling the effects of external ground-related noise. These sonic advantages deliver a natural, fatigue-free sound, letting users fully lose themselves in their entertainment. All major post-D/A converter stages are unified with balanced circuitry and discrete configuration, for fully balanced transmission. Balanced conversion is also built in for conventional unbalanced inputs, delivering the unique advantages of balanced transmission and amplification, such as minimising external noise and audio deterioration, and applying them to a wide range of input sources. Using a set of balanced-input headphones further enhances signal separation for optimum headphone listening.
ELITE, ULTRA-HIGH PERFORMANCE 32-BIT D/A CONVERTER FROM ESS
Yamaha has spared no expense in achieving the superior sonic quality that this ultimate audiophile headphone amplifier deserves. To this end, we’ve incorporated the famed ES9038PRO converter from ESS Technology, an outstanding DAC recognized throughout the industry for top-quality reproduction of high- resolution audio. The chip with its dedicated master clock utilises a crystal oscillator with ultra-low phase noise to attain exceptionally precise D/A conversion, and features a built-in eight-channel D/A converter that applies four-channel conversion to both the left and right sides. Utilising this four-channel bundle delivers exceptionally high-quality audio output with broad dynamic range and superior signal-to-noise ratio. Which unlocks a greater sense of enjoyment and intimacy in headphone listening, and lets the user experience even the detailed ambience of the concert hall and the most expressive sonic nuances in the instruments.
LOW-FREQUENCY REPRODUCTION AND REMARKABLE SPACIOUSNESS FROM DUAL TOROIDAL TRANSFORMERS
In the HA-L7A, Yamaha has endeavored to fully convey the contrast between serene stillness and powerfully dramatic motion in the sound, and so we’ve given the amplifier two toroidal transformers as well as a unique, highly rigid construction. Accepting no compromise, we’ve achieved outstanding low-frequency response to finely detailed audio, luxurious volume, and extraordinary transparency — to ensure accurate reproduction of all kinds of content with dynamic and realistic sound. The power supply section employs independent transformers for the minute-signal circuitry in the front stage and the amplifier section in the second stage, and implements a separate power supply design that minimises noise from mutual signal interference. Moreover, the use of toroidal transformers significantly reduces magnetic flux leakage, while employing bifilar coiling minimises voltage variations, which in turn enhances the stability of the power supply, and achieves overwhelming spaciousness with powerful low-frequency reproduction.
HIGH RIGIDITY CONSTRUCTION — ELIMINATING SONIC IMPACTS FROM VIBRATION
To fully eliminate any negative impact of external and internal vibrations on the audio signals, we’ve given the unit a rugged construction that combines innovative design with highly rigid parts. The L-shaped top is made from extruded aluminium of 8 mm thickness, while the naturally vibrating toroidal transformers are mounted firmly onto a 2-mm-thick steel plate. Providing even stronger support are a thick front panel, a double rear panel, and a unique, heavy-duty housing featuring a bottom cover at the end. This suppresses unnecessary vibrations, enabling powerful yet supple low-frequency reproduction, and completely conveys the powerful energy and genuine realism contained in the music. The distinctive L-shaped body is supported by five conical steel feet at each corner, with dampers cushioned between each foot and the bottom panel for suppressing any vibration, giving firm, stable support even on a desk or tabletop. Together with the hefty 5.3 kg body, all elements work together to effectively eliminate unwanted vibrations and achieve focused, realistic sound reproduction.
SOUND FIELD MODE FOR UNPARALLELED IMMERSION WITH ANY CONTENT
Yamaha’s unique SOUND FIELD mode and superior sound field recreation is only possible through our unwavering commitment to the best in sound reproduction. With a realistic, natural sound field that allows listeners to completely lose themselves in the content, we introduce a new entertainment experience previously unavailable in headphone amplifiers. This is a truly immersive feeling, as if actually entering the very performance space of the artist. The HA-L7A features the same Yamaha sound field creation technology incorporated into many of our AV receivers, and utilises the unique signal processing and multi-channel expansion technologies Yamaha has developed over its many years of designing AV components—bringing them now into the headphone field. And one of the stunning results is the built-in SOUND FIELD mode, which features six convenient presets for reproducing the optimal sound field for the entire scope of music, video, and other specific sources — letting the listener enjoy all kinds of entertainment content with a full sense of realism and immersion that gives headphone listening an entirely new dimension.
LOW-NOISE CIRCUIT DESIGN & HIGH-QUALITY PARTS
Another aspect that distinguishes the HA-L7A is a low-noise design that isolates the three circuit boards: the main board that handles minute signals, the amplifier board and the amplifier, and the power supply board for the system. In addition, the main board is designed to eliminate any undesirable cross effects between the digital and analogue signals, thanks to multilayer construction and thorough eradication of ground loops. For the volume circuit, we’ve used the MUSES72323, famed for its exceptionally low distortion and low-noise output, while the power supply IC, made by Analog Devices, boasts low output noise with high ripple rejection. Finally, the converter section features the top-class ES9842QPRO, made by ESS Technology. By using only the highest quality parts meticulously selected through repeated listening tests, we have achieved the most natural sound field reproduction possible.
CONNECTIVITY WITHOUT COMPROMISE – THREE FRONT-PANEL HEADPHONE JACKS, INPUT/OUTPUT TERMINALS FOR EXPANDABILITY
Compatible with the widest possible variety of music, video and entertainment sources, the HA-L7A brings the listener into profound immersion in their favourite content, with sonic performance to match even the most demanding headphones. Add in comprehensive connectivity and expansion flexibility, and the headphone listening pleasure further expands and deepens. The front panel features two balanced headphone jacks — for full enjoyment of the detailed, faithful quality of balanced circuitry — and one unbalanced headphone jack with reduced contact loss thanks to gold-plated processing. Famed NEUTRIK jacks are used for the XLR balanced headphone jacks, and Pentaconn terminals are used for the 4.4 mm 5-pole terminals, unleashing the sonic potential of any connected headphones. The comprehensive set of input terminals on the HA-L7A, including USB (type B), coaxial, and optical, ensures connection with virtually any device, such as high-resolution DAPs (digital audio players), PCs, and CD players. The built-in XLR and RCA pre-out/line-out output terminals allow the unit to also be used as a D/A converter or preamplifier, providing further connectivity and expandability options.
QUALITY THAT CREATES THE SATISFACTION OF OWNING AND USING
Even as this headphone amplifier prioritises sound quality with its pragmatic internal design, it is the stylish exterior that truly transforms the listening space into a special environment. The thoughtful design and high-quality texture gives both visual and tactile enjoyment when using it with high-quality headphones. Two transformers are mounted on the main frame in a time-honored design with a low centre of gravity, and are represented in the unique external appearance, invoking fine modern architecture. Furthermore, the vertical three-dimensional structure places the transformer immediately above the power supply board, minimising the power supply path, contributing to a design that delivers both high sound quality and external elegance. Boasting a sturdy, thick aluminium chassis, aluminium is also used for the master volume and mode selector dials. Moreover, an abrasive sandblasting process has produced a high-grade textural feel, contributing to the elegance of high-end audio right down to the smallest detail, for a luxurious tactile experience when using the HA-L7A. The top panel of the unit features an OLED display that provides a variety of important information—including the input source, sampling frequency, volume, and the name of the SOUND FIELD preset — in an easy-to-read manner. The display automatically turns off after being operated, eliminating any distraction or undesirable effects on the sound.