Yamaha White Paper (Installation Series Speakers) User's Guide download pdf (Page 11)

A White Paper Of The Installation Series Loudspeakers

4. Designing and developing

style

Designing, as well as developing a prototype,

was made in three separate stages.

In the first stage, Proto 1 for the first sound

evaluation was developed. In the second stage,

Proto 2 was developed, reflecting the result of

the Proto1 evaluation. The basic designing of

the enclosure and horn, as well as driver

selection, was done by "Audio Composite

Engineering".

Yamaha made the detailed data measurement

and listening test not only in the anechoic room

but also in the practical environment. Then the

analyzed results, as well as summaries of issues

and resolutions, were reported to "Audio

Composite Engineering" for feedback.

In the third stage, based on Proto 2, the

preproduction was made in the factory where

the final products were produced, using the

parts and materials for mass production. This

was the trial production stage for checking the

quality of the final mass production products.

Various enclosures using different materials or

paints were made. Various components were

mounted to these enclosures and tested.

The following reports the current situation for

each component.

- Horn

We evaluated horns by measuring data such as

the phase response and amplitude response, as

well as giving listening tests to check clearness,

resolution, audio image size, etc.

The horn with 1.4-inch throat used for 15-inch

and 12-inch models improved sound

penetration and resolution. This is the

maximum size horn that can be fitted in the

enclosure. The material is FRP that is enhanced

using glassfiber, and deadened by adding the

anti-vibration material.

All horns are rotatable within the 90 degree

range.

- Compression driver for high-frequency

range

After repeated listening tests for pursuing the

family sound, we selected drivers. In result, all

selected drivers are made by the same

manufacturer.

The driver used for the 15-inch or 12-inch

model features the 3-inch voice coil and

titanium diaphragm. The edge and diaphragm

are integrated. The edge is tangentical type for

higher durability and better tone quality.

- Woofer for low-frequency range

To prevent collapsing the sound image at high

power, the 15-inch and 12-inch woofers use 4-

inch voice coils.

The woofer has been carefully selected by

considering the following.

- Offering both the high damping factor and

smooth low-frequency response

- Sonic matching with the enclosure

- Smooth crossover to high-frequency

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