Yamaha RX-Z9 Digital Home Theatre Speakers, Waveguide Horn HX Series and EF Series, Advanced YST

Digital Home Theatre Speakers

A wide range of speakers for every type of home theatre system

As high-quality home theatres have become more popular, Yamaha has created high-performance speakers

to match. These speakers are characterised by their robustness and dynamism in the reproduction of the

current multi-channel sound standard and offer the music lover a pleasant musical sound. Thanks to its

own patented technologies, such as Advanced YST or QD Bass, Yamaha subwoofers offer powerful and

precise bass reproduction from robust housings with compact dimensions.

PMD Cone Woofer Uses Advanced Technology

and Materials (515 PMD, 225 PMD and PMD

Series)

Digital Home Cinema Speakers feature a unique Polymer- injected Mica Diaphragm (PMD). The diaphragm is composed of 30% top-quality white Indian

Pearl Mica, chosen for the Microscopic View of amazing contribution it makes to Polymer-Injected Mica.

sound quality. In order to

maximise its distinctive qualities, absolutely no colouring is added to the material, and the cone's shape, produced by injection moulding, is a natural catenary curve. Extremely lightweight, it achieves

Waveguide Horn (HX Series and EF Series)

When conventional direct radiating speakers are used in a home environment, their broad directional characteristics result in a relatively high proportion of reflected sound. Modern movie theatres, however, are designed to offer a highly absorptive acoustic environment in which

soundtrack recordings with five or more channels can be used to achieve a rich sense of spatial expression. To achieve a similar level of spatial expression at home, it is therefore necessary to use speakers with a direct/reflected sound ratio

loss yet is highly durable. It is capable of reproduction all the way up to 50kHz, which is rare for a 3cm dome tweeter. Highs are crisp and clear even at high power levels.

QD-Bass Technology QD-Bass (Quatre Dispersion Bass) technology uses down-firing drivers with square, pyramid-shaped reflective plates to radiate the sound efficiently in

four horizontal directions. The reflective plates negate any effects caused by the floor surface and reduce resonance between sound waves reflected

good stiffness along with ideal internal loss and a

that is quite different from

Waveguide Horn (NS-8HX)

from the floor and the unit.

high modules of elasticity.

WSD Cone Midrange and Woofer (HX Series)

Yamaha's White Spruce Diaphragm (WSD) material emerged from an intensive search for a light, tough diaphragm material that would help us achieve ideal home cinema sound. The pulp material used for the WSD is manufactured almost entirely from long fibres of Canadian evergreen white spruce, the world's lightest single-sheet diaphragm material.

the speakers used for conventional music recordings.

All-Aluminium Dome Tweeters and Diffusers (HX Series and 515 PMD Series)

Both the shape and material used for dome tweeter diaphragms and diffusers were refined to improve speed and response. 30µm pure aluminium film was formed into a new dome shape and fitted with an all-aluminium diffuser for wide-ranging 50kHz sound reproduction capability.

3cm Aluminium-Magnesium Dome Tweeter with DC-Diaphragm™ (225 PMD Series)

The high-performance tweeter features a dome made of an aluminium–magnesium alloy, with a DC-Diaphragm™(integrated diaphragm and voice coil). The tweeter is extremely light to minimise

Advanced YST

Advanced Yamaha Active Servo Technology (Advanced

YST) is a unique system in which the speaker and amplifier work together to cancel out impedance so the speaker unit has a perfectly linear motion. Advanced YST helps to ensure the highest levels of sound pressure and overall performance.

Advanced YST II

In Advanced YST II, an Advanced Negative Impedance Converter enables the speaker cone to be driven with even tighter control. The result is more stable and accurate low range response, as well as higher sound pressure levels, for more natural and energetic bass reproduction.

How Yamaha achieves our “ideal” sound.

The key to achieving the purest, most natural, and most pleasing sound is balance. Balance among the above three elements, balance among all the components that make up the speaker, and balance among subjective listening judgments.

Testing and More Testing

Yamaha tests speakers in various ways, both before and after production. Each part of the speaker, be it a coil, a capacitor, or a cabinet, is selected out of many alternatives, which may be tested for months before a

decision is made. In the case of cabinets, for example, we often build 50 to 60 cabinets and test each one. In order to test many cabinets with many drivers in many configurations, we begin with computer simulations, then move to actual prototypes for measuring a myriad of factors, such as the variations of standing waves inside the cabinet. An anechoic chamber is used to obtain precise acoustic data on pre-production models. Even speaker finishes are rigorously tested for durability and how they influence the sound. We have an environmental room where speakers are tested for 500 hours in Amazon rain forest conditions, and five different listening rooms,

where speakers are carefully evaluated reproducing a variety of music and movie sources.

The Final Judgment

Throughout the design process and especially in the final phase, our most important test equipments are the ears of our speaker experts. Having hard data is helpful, but deciding which cabinet sounds “better” and whether the speaker meets Yamaha’s high standards can only be done by the “golden ears” of Yamaha speaker designers who have dedicated their lives to the pursuit of beautiful, natural sound.

1.Many cabinets are built and tested for each speaker series.

2.A testing room that simulates an actual listening room.

3.A wide range of parameters are tested.

4.Speakers undergo harsh environmental testing.

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