User manual FOSTEX NF-1

[. . . ] 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. [. . . ] This allows successful elimination of sound colorization caused by undesired natural vibration. design, with a focus placed on natural transition between the woofer and tweeter. * 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 environments. * 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 realized. 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 performance. 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. Connection Terminal (for tweeter) Red=plus, Black=minus Metal Pieces <Note> 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. <Note> 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. Connection Terminal (for woofer) Red=plus, Black=minus <Fig. [. . . ] 5> Tweeter driving amplifier <Upright position> <Fig. 7> L channel R channel <Horizontal position> <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. [. . . ]