Safety Precautions
Owner’s Manual
Near Field Studio Monitor Speaker System
The NF-1 is a near field studio monitor speaker system providing the highest capability of
analyzing, checking and reproducing audio components contained in the original sound.
Built-in speaker drivers are a 16 cm woofer and a tweeter, positioned to ensure accurate and
excellent time alignment, and thus optimum performance. The woofer features an HP
diaphragm, UDR tangential edge and push-pull damper developed for this particular driver.
The tweeter is of a soft dome type, another new development of a UFLC diaphragm. The
speaker terminals are configured to allow for a bi-amplifier drive system so that each speaker
can achieve its capability to the fullest extent. In addition, both the woofer and tweeter are
built using a cast aluminum frame, and HP sound reflectors are arranged inside the enclosure.
Embodiment of Fostex’s new technologies in every detail of the speakers and enclosure structure
has allowed this NF-1 system to offer low distortion and highly transient bass, which have up
to now not been available with conventional diaphragm technology. Also, high compliance/
reproducibility of the subtlest audio signals makes this NF-1 a truly wide range speaker system.
Thanks to these features, NF-1 can demonstrate its ability as an ideal monitor speaker system
for recording studios where sound reproduction of highest precision is essential. Please read
this manual thoroughly so that unmatched audio performance featured in this NF-1 speaker
system can be yours.
Safety Precautions
* Avoid use of NF-1 where contact with water is likely.
Otherwise, fire and/or electrical shock may result.
This precaution is particularly important when the
system is used outdoors (on rainy or snowy days, on
the beach or other such places).
* Uninterrupted use under abnormal conditions,
including smoke or odors, may result in fire and/or
electrical shock. On perception of such conditions,
the power of the connected amplifier must be
immediately turned off and the power plug of the AC
adaptor must be disconnected.
* When attempting to connect other audio equipment
to your NF-1, be sure to connect in strict compliance
with the wiring instructions given in the manual
provided with such equipment, before inserting plugs
of such equipment into wall outlets. Use of the
designated cords is also a prerequisite.
* For installation of your NF-1, avoid mounting or
setting on unstable surfaces, including wobbly or
slanting planes. Placement of NF-1 on a shelf is
allowed only with application of solid anchoring
provisions to prevent falling when shaken. Contact
with a falling NF-1 may cause serious injury.
* Avoid installation of NF-1 in extremely smoky or
steamy places to lessen the likelihood of fire or
electrical shock.
* Avoid application of excessive input power to the NF1, otherwise, fire or failure of NF-1 may result.
No power greater than that specified in this operation
instruction manual must be applied to the system.
* Strict compliance with the precautions and use
instructions described in this manual is required for
ensured safety and continued performance of NF-1.
Reading this manual thoroughly and complying
with the instructions is vitally important.
Main features of NF-1
* An HP diaphragm of a new type is used in the 16 cm woofer.
Sound quality of low distortion and high transition, which
no other diaphragms can offer, has become a reality.
* Anti-resonance is eliminated by the use of a UDR tangential
edge and push-pull damper in the woofer. Also, substantial
improvement is made in linearity, and thus, accurate
response to the subtlest sound signals is realized.
* The tweeter employing a UFLC diaphragm (of soft dome
type), being most compliant to and reproducible of even
the subtlest signals, are of a wide range design up to 40kHz.
* A highly rigid cast aluminum frame is used for both woofer
and tweeter. This allows successful elimination of sound
colorization caused by undesired natural vibration.
* The network used is of a low-loss -6 dB/oct. design, with a
focus placed on natural transition between the woofer and
* The time-aligned enclosure structure has a baffle
configuration which will prevent natural vibration noise
from developing due to diffraction of reflected sound.
The use of HP sound reflectors provides an ideal internal
sound processing means for elimination of natural
vibration developing within the speaker enclosures.
* A much wider listening area than that available with
previous products is ensured due largely to the use of an
HP diaphragm and a dome tweeter. A bi-amplifier/biwiring system provision is included for speaker driving
most suitable for individual recording studio
* The adoption of a magnetic leakage preventive structure
in both the woofer and tweeter permits placement of NF1 in close proximity to video monitors.
Particulars of each component
* HP diaphragm
“HP”, an abbreviation of a hyperbolic paraboloid normally
called an “HP” shell or “hyper shell”, is a 3-dimensional
curved surface structure. This HP structure is characterized
primarily by the fact that movement of a straight line
connecting 2 line segments, which do not share a single
plane, forms a hyperboloid and paraboloid.
HP diaphragm’s configuration is determined by locating
inflection points at the top and bottom to form vertical
symmetry, so as to disperse stress with pentagonal divisions
which are asymmetrical to the center of the diaphragm, as
shown on Figure 1, as the basic option, and the height of
curved surfaces is selected so that optimal frequency
dispersion as dictated by FEM modal analysis results can be
The base diaphragm materials are NBPK and banana fibers,
with carbon fibers of a super high elasticity modulus, PBO
super-fiber and pearl mica used as reinforcement materials,
Cellgaia pulp as super damping fibers and bio-cellulose used
as the matrices material.
HP diaphragm
* UFLC diaphragm
A UFLC diaphragm, made of polyurethane plastics which is
urethane film laminated over cloth, is used in the tweeter.
The use of a UFLC diaphragm allows the highest fidelity
sound reproduction which extends naturally to extremely
high frequencies, which had not been possible with
conventional soft dome technology.
* HP sound reflector
HP sound reflectors represent sound reflectors of the HP
system arranged inside the enclosure, as depicted in Figure
2. NF-1 has this type of reflectors and micron wool arranged
optimally in enclosures to diffusely reflect the sound present
in an enclosure, which creates conditions where no standing
waves may develop, and finally, for natural attenuation.
HP sound reflector
Tangential edge
<Fig. 1>
* UDR tangential edge
A new era has been opened by the UDR (Up/Down Roll)
tangential edge structure which is created by joining uproll and down-roll at their tangential surfaces. It is
configured, through model analyses, to function optimally
as diaphragm edges. Use of this edge is with the woofer
which plays a key part in the overall speaker system
Push-pull damper
<Fig. 2>
* Bi-wiring/bi-amplifier system terminals
To ensure ideal driving capability of each speaker
(woofer and tweeter), NF-1 has a 4-terminal base (for
banana shaped tips) to enable independent
connections. The default setting has the woofer
terminals located at the lower part of the base and
the tweeter terminals located at the upper part are
connected with metal pieces, as depicted in Figure 3.
When a bi-amplifier system is used, attention must be paid not to
connect the woofer and tweeter in opposite phase. Terminals must
be securely tightened after speaker cables are connected. Failure to
do so may result in poor contact and unwanted vibration.
Connection Terminal (for tweeter)
Red=plus, Black=minus
Sound levels of the woofer and tweeter can be independently
adjusted when a bi-amplifier system is chosen, as shown in Figure
6. In this case, particular attention must be paid to the tweeter to
prevent excessive power input to it.
Metal Pieces
Connection Terminal (for woofer)
Red=plus, Black=minus
<Fig. 3>
For normal use of NF-1, connect speaker cables to the
woofer terminals. Don’t remove the metal pieces.
(Refer to Figure 4.)
L channel
R channel
<Fig. 4>
However, removal of the metal pieces is necessary
when use of bi-wiring or bi-amplifier system is
Figure 5 represents bi-wiring connection, and Figure
6, bi-amplifier connection where 2 amplifiers are used.
L channel
R channel
Installation notes
* Location for optimal time alignment performance
The extended listening area offered by NF-1 is made
possible by careful and precise determination of
speaker positions in terms of the direction of
diaphragm vibration and by placing the 2 speakers
as closely together as feasible. The resultant best
listening positions cover, when speakers are connected
in phase, the area created by the axes of the woofer
and tweeter. Opposite-phase connections will raise the
optimal listening points and the monitoring area will
become narrower than with in-phase connections.
Attainment of perfect phase characteristics requires
determination of the connection best suited to the
specific studio environment. Recommended for most
cases are in-phase connections with the speaker system
location decided in adherence to the previous
installation instructions.
This accurately and precisely time-aligned NF-1 is
designed for use in the upright position as shown in
Figure 7. Due to the fact that human ears are very
sensitive in the horizontal direction, use of the system
in that position is discouraged.
<Fig. 5>
<Upright position>
Tweeter driving amplifier
<Fig. 7>
L channel
R channel
<Horizontal position>
<Fig. 8>
<Fig. 6>
Woofer driving amplifier
Don’t place any beverage containers on the enclosure. When spilt,
there is great likelihood of damage to the speakers.
Optimal listening points and setting
Setting of the system is ideal when the mid-points of the woofer and tweeter meet the listener’s ear level to allow
full enjoyment of the NF-1’s ability. (Please refer also to Figure 10.) Then, mutually orient them 15 to 30 degrees
inward to form a triangle as shown in Figure 10, with the open vertex of the triangle falling at the planned
listening position. The listening position thus determined represents the point where the design intent can be
enjoyed to the fullest extent.
Center of the tweeter
Center of the woofer
15 to 30 degrees
15 to 30 degrees
Mid-point of the woofer and tweeter
<Fig. 10>
<Fig. 9>
Maintenance precaution
Be careful when cleaning speaker/enclosure surfaces!!
* No protecting grilles or covers are provided with NF-1.
Brush off dust attached to surfaces of speakers with soft
dusters. Avoid direct fingers or damp dust cloth contact
with diaphragms.
* Stained enclosure surfaces must be wiped with tightly
wrung-out soft cloth after immersion in a diluted
detergent. Under no circumstances must organic solvents
such as paint thinner be used.
Frequency Response
Sound Pressure Level
Input (Program)
Crossover Frequency
Enclosure Type
16 cm Woofer x 1
Dome Tweeter x 1
50Hz ~ 40kHz
89dB/W (1m)
Approx. 9.1kg
Bass Reflex Type
Speaker Unit
<Frequency/Impedance Response>
* Specifications and physical appearance are subject to change without notice.
2nd order distortion
3nd order distortion
<Distortion Response>
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