Yamaha White Paper (Installation Series Speakers) User's Guide download pdf (Page 9)

A White Paper Of The Installation Series Loudspeakers

characteristics of the two drivers, the phase

difference is 360 degrees.

However, from the view point of boost/cut of

the amplitude characteristics, it can be regarded

as the same phase, which can avoid the level-

down problem in the crossover range. This

method is simpler and easier than the

"minimum phase change type", though the

phase significantly changes over the whole

range.

<Figure 10: "Minimum phase change type" and "same

phase slope type"

Minimum phase change type

Same phase slope type

Before starting designing the "Installation"

series, we made prototypes of both "minimum

phase change" and "same phase slope" types,

and gave a listening/comparison test. The

following shows the result.

When testing with a bi-amp speaker using the

DSP, though there was a different nuance in the

crossover range, it was hard to say which one

was better.

When testing with a passive speaker, the

minimum phase change type with a simple

network circuit sounded better.

Also, there was a fear that each model may

have the different delay time of the low-

frequency driver if all the "Installation" series

speakers were adjusted by applying the "same

phase slope" method. This might cause the

problem when using more than one speaker

together.

By these reasons above, we decided to use

"minimum phase change type".

2) Tone quality control

180

Phase (degree)

(1) Target sound

We set the main targets of the "installation"

series to halls, theaters and churches.

-180

Frequency

Such facilities might have conferences, music

concerts, musicals, lectures, etc. Therefore, for

the SR system, offering clear and good sound

was the minimum requirement, as well as

providing enough audible level at any position

in the area.

Furthermore, it was also required to offer high-

fidelity sound for vocal and music instruments,

as well as for playback of music or ambient

sound.

Therefore, for tone quality of the "Installation"

series products, we aimed for realizing the

following, in addition to the flat amplitude

characteristics.

Speech intelligibility

- Well-balanced and well-separated tone for music

180

Phase (degree)

-180

Frequency

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