User manual FOSTEX NF-1

[. . . ] 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. [. . . ] * 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 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. [. . . ] 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 inward 15 to 30 degrees inward Mid-point of the woofer and tweeter Listener <Fig. 9> Maintenance precaution Be careful when cleaning speaker/enclosure surfaces!! * No protecting grilles or covers are provided with NF-1. [. . . ]