Yamaha Drum Set ATT1510U User Manual download pdf (Page 5)

“Air Seal System” Technology

At Yamaha, the process of manufacturing drum

shells begins with the selection of the materials.

Select woods are cut into sheets with precision

cut diagonal ends. The plies are ﬁ t into a form and

hammered into place by a highly skilled craftsman.

The angled ends allow the craftsman to ﬁ nely adjust

the ply length, thus maintaining proper tension. Ply

joints are staggered by 120-degrees and hammered

into place in the same manner. An air bag placed

inside of the shell and inﬂ ated at high-pressure puts

even pressure on the shell’s inner surface creating

a perfectly round shell with uniform thickness and

excellent durability.

This is the Air Seal System, a process that has been

in use at Yamaha for over 40 years.

Shell Materials

High Performance Lugs

Yamaha lug casings hold tension rods ﬁ rmly in place.

They afford precise tuning in the smallest increments

and do not slip. From our truly innovate Hook Lugs

which offer lightning quick changes, to ﬁ xed small

lugs. (Absolute and Oak Custom lugs) Each is low

mass and is designed to promote optimum shell

resonance.

Our legendary one-piece high-tension lugs are

precision-machined to allow severe, high tension

tuning also reinforced the shell.

Hybrid Shell Construction for PHX Series

(Patent Pending)

With the wealth of knowledge that YAMAHA has amassed through the decades as the preeminent maker of musical

instruments, YAMAHA’s wood specialists have discovered new materials that provide optimal drum performance.

Jatoba, a Brazilian wood and the hardest material in the PHX hybrid shell, is positioned as the core ply and center note

of the drum. It is surrounded on either side by layers of kapur, a Malaysian hard wood. North American Maple, which

had long been considered a classic, high-quality drum shell material because of its hardness and viscosity, is actually

the softest wood in the shell construction; maple is the outer and inner plies of the shell.

This is the process used to complete the hybrid shell, in which the stiffness of the shell shifts from the center toward the

outside: the woods are hardest at the center and get softer toward the outer surfaces in either direction. This results in

an “excitation structure” that maximizes the shell's performance. The excitation structure increases the head’s vibration

to its full extent, achieving a sound unlike anything you’ve heard before. It produces an effect in sound waves similar to

rippling waves caused by a pebble dropped in water.

MAPLE

Hard, dense maple delivers a warm tone with outstanding

sustain and is considered an excellent material for

making drums.

Yamaha goes to great lengths, sorting the woods into

ﬁ ner grades and using them accordingly. Maple produces

a versatile tone that blends well with a wide range of

musical styles, making it popular with drummers from all

over the world.

BIRCH

Yamaha’s use of birch is longstanding. Remarkably

easy to work with, this hard, ﬁ nely grained wood offers

excellent mid and low sustain with a solid, well-deﬁ ned

high range. Our original “Recording Custom” drums are

made from birch grown in Hokkaido Japan.

OAK

Yamaha has developed special techniques for employing

oak, previously considered unworkable for drums. Our

oak shells offer tone that is at once loud, sensitive,

ringing, clean, and vibrant. While its inherent power

makes it the ideal heavy metal drum shell, its stark clarity

at low volumes have made it a new discovery for jazz

players. Oak is as individual as the drummer playing it.

AIR-SEAL

SYSTEM

* The excitation structure increases

shell vibration to its maximum

through the use of relatively softer

materials for the external and

internal surface areas, whose

curvature is greatest when the

shell is vibrating, as well as by

using a hard material with a high

“spring” property for the core of

the shell lamination.

The wave pattern of the

harmonic overtone

The secret of our YESS system is

twofold: First, it provides minimum

contact of hardware with shell; second,

it connects that hardware at the nodal

point* of the drum—the point at which

it will not interfere with shell vibration.

Nylon bushings on rod clamps afford

maximum stability. The YESS system

permits toms to be placed close together,

and does not interfere with quick head

changes. On floor toms, our YESS

system offers wide open sustain while

keeping toms stable under the heaviest

strokes.

The newly evolved YESS II Shell

Mounting System makes the most of the

shell's vibration. Employing a special

new rubber material and the "wood plate

mounting" method, vibrations from the

shell and hardware can be separated,

thus minimizing unwanted resonance.

Also, by positioning a part of that special

rubber material at the belly area (where

overtones are present) while most of

them are positioned at the nodal point,

the appropriate amounts of sustain and

overtone control are simultaneously

produced.

And also newly evolved YESS II-m is

using same technology but using metal

plate instead of wood plate.

Yamaha Enhanced Sustain System—YESS / YESS II / YESS II-m

The wave pattern of the

fundamental tone

A detailed drawing of Special Rubber

Nut

Wood Plate

Special Rubber Shell

Nut

Hook Lug Absolute Lug High Tension Lug

YESS II YESS II-m

YESS

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Yamaha Drum Set ATT1510U User Manual Page 5

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