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transiency and thus in metal-specific sound. Hard
dome tweeters, therefore, are suitable for speaker
systems where the aim is for creation of sound
characterized by such materials (metal-specific
sound).
1) UFLC material
A common previous practice when producing soft
domes is direct application or coating of damping
materials on polyester cloth to avoid adverse effects
of such materials caused by porosity or specific
inherent sound on the reproduced sound. This way
of production of soft domes, however, is subject to
variations in the amount of applied damping
materials, resulting in generation of dips in the
response due to pinholes, low output level due to
excessive application of damping materials, or
deteriorated high end reproduction due to loss of
material strength. Our new development, being the
UFLC materials, is our solution to these problems.
With it, light and highly stable diaphragms have
become available.
The UFLC materials consist of the following
component materials:
U: Polyurethane
This plastic features large internal loss, light weight
and good bonding performance.
F: Film
Prior processing is given to polyurethane resin to
roll it to an extremely thin film of a consistent 25
µ
m thickness.
L: Laminated
The base material and polyurethane film are pressed
while heated to bond them tightly together.
C: Cloth
The base material is large-meshed porous polyester
cloth, chosen for its lightness and strength.
The use of this UFLC material provides a 30%
weight reduction and consistent quality. The dome
shape of a newly developed special configuration
brings about ideal performance characteristics for
soft domes.
The frequency response range widely and naturally
extends to the extreme high end of frequencies,
which had not been possible before development of
this dome design, reproducing each segment of
delivered sound signals to its highest fidelity.
2) Die-cast aluminum frame
Conventionally, tweeter frame materials for speaker
systems of this class have been plastics such as
ABS. Incapable of suppressing high frequency
vibration energy, plastic frames are usually
accompanied by undesired noise caused by
resonance, and thus poor trangency.
With the use of a 6.5 mm thick die-cast frame on
the NF-1 tweeters to assure the necessary and
sufficient strength, this problem has been solved,
and conditions become possible for utilization of
the merits and advantages of the high grade UFLC
diaphragms to the fullest extent. Consequently,
highly transient sound quality has resulted.
The athletic track-shaped and tapered frames
successfully reduce magnitudes of natural
resonance and make it possible to place the tweeter
closest to the woofer to allow for the narrowest
phase shift range.
3)Low-leakage magnetic circuit
To avoid interference with nearby magnetic devices
and displays, a canceling magnet is used in the
magnetic circuit. The canceling magnet functions
to lead outflow of the lines of magnetic force to the
gap, elevating flux density in the gap to as high as
1.2T.
FEATURES OF THE ENCLOSURE
FEATURES OF THE ENCLOSURE
1) Driver arrangement oriented for time alignment
The most important characteristics of speaker systems
include a phase characteristic. This characteristic is of
particular importance to monitor speakers at the places
where they are used for monitoring. The prime measure
taken to address this issue was execution of positional
alignment of the woofer and tweeter to locate them as
close to each other as possible for the maximum
available monitor area.
NF-1 is designed for optimal sound when listened to at
positions between the axes of the woofer and the
tweeter, if connected in phase. In the case of opposite
phase connection, the optimal listening positions shift
beyond the tweeter position, with the optimal listening
range being narrowed.
Application conditions of NF-1 in studios are the
determining factor for connections to ensure perfect
phase characteristics. In-phase connection should be the
primary option, unless otherwise dictated by the
application environment.
Due to the fact that human ears are very sensitive to the
horizontal direction, arrangement of drivers in that
direction is undesirable in terms of phase. It should be
kept in mind that perfectly time-aligned NF-1 is
designed for use in an upright position.
Summary of Contents for NF-1
Page 1: ...Technical White Paper NEAR FIELD STUDIO MONITOR ...
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