Fostex NF-1 Series Technology White Paper

Near field studio monitor

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Page 1 Web: https: // www. pearl - hifi . com 1 - 94 Broadway St. West, Nakusp, BC V0G 1R0 E-mail: sales@ pearl - hifi . com Land: + 403.244.4434 Mobile: + 587.578.4434 Perkins Electro-Acoustic Research Laboratory, Inc. Engineering and Intuition Serving the Soul of Music Please note that the links in the P logotype above are “live”...
Page 2 Verso Filler Page ♦ ♦...
Page 3 NF- 1 PROFESSIONAL Near Field Studio Monitor...
Page 4: Main Features
B L A N K S H E E T O F P A P E R Nothing more, nothing less. features a baffle configuration And at any volume. So what makes the Fostex NF-1 so and HP sound reflectors Here is a monitoring system different? For a start, Fostex started...
Page 5 It too must be acoustically designed unit, one which features UFLC in its Hooking up a pair of Fostex NF-1’s to minimise the vibrations which construction. for the first time is somewhat of a can colour the sound.
Page 6: Specifications
* woofer ƒ tweeter Distributor / Authorised NF-1 Dealer www.fostex.co.jp Fostex Corporation, 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021 Tel: +81 (0)42-546-4974 Fax: +81 (0)42-546-9222 In accordance with our policy of continuous development, we reserve the right to change specifications without notice. E&OE.
Page 7 NF- 1 Series Near Field Studio Monitors PROFESSIONAL...
Page 8 BLANK SHEET OF PAPER Nothing more, nothing less. for a wide optimum listening area And at any volume. So what makes the NF-1 series so NF-1A Here are nearfield reference different? For a start, Fostex started monitors meticulously designed to...
Page 9 This allows for bi-wiring and NF-1/NF-1A. But as good as these bi-amping techniques. are in standard form, Fostex felt the T H E T R U T H need to develop a new type of soft the vibrations which can colour and dome unit, one which features UFLC degrade the sound.
Page 10 10000 20000 40000 Distributor / Authorised Dealer www.fostex.co.jp Fostex Corporation, 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021 Tel: +81 (0)42-546-4974 Fax: +81 (0)42-546-9222 In accordance with our policy of continuous development, we reserve the right to change specifications without notice. E&OE.
Page 11 Technical White Paper NEAR FIELD STUDIO MONITOR...
Page 12 - 2 -...
Page 13 FEATURES THE "SHOULD BE" OF MONITOR 2)To express to the fullest extent all the musical FEATURES nuances intended by the musicians and ♦ Employment of a 16 cm woofer featuring a engineers. newly developed HP diaphragm has made it a 3)To provide engineers with a highly efficient reality to reproduce low distortion and highly work environment where they can work,...
Page 14 BASICS OF THE HP SYSTEM 2) HP Diaphragms having torsional curved surface In addition, upon development of a near-field monitor, we decided to expose our speakers to Nothing is free of natural self-resonance frequency. users' evaluation as to its true value, by placing the It has been known that self-resonance frequency focus on a passive type, or non-amplified type, creates sound inherent to the material, perceptible...
Page 15 One of the properties of the HP structure is the at around 600 Hz or peaks at the high end of around unlikelihood of development of inherent timbre 4500 Hz due to anti-resonance of the edge. Figures because of widely dispersed resonance. 5 and 6 compare the FEM modal analysis results.
Page 16 δ and HP diaphragms as the basic option. propagation velocity. Meanwhile, Fostex has succeeded in development of banana pulp 2) Properties required of diaphragm materials materials comprising long fine fibers with a high level of bonding strength provided by the intrinsic Factors of importance with diaphragm materials starchy component.
Page 17 B) Enforcement material A: Carbon fiber of a family of aramid fibers.This fiber, used in a super high elasticity modulus combination with the enforcement material A, with a strength 2 times that of previous aramid fibers, Cases abound where carbon fibers are used for adds flexural rigidity and permits substantial cones.
Page 18 Sound quality of wood pulp cones is said to thickness-stiffness parameter. Fostex has succeeded fluctuate depending on ambient humidity. in development of new materials which will allow...
Page 20 When determining the blending detail not to miss a enhancing the bonding strength of all materials, and subsequently, substantially improving resistance to single piece of the subtlest signal components in reproduced sound, a greater amount of attention to humidity. These materials, being equivalent to the propagation velocity than to that of diaphragms was coating applied on the famed Stradivarius violins, help give the feeling of being present in a natural...
Page 22 Reduction in Improvement of amplitude response: No resonance is observed on the entire circumference, nor is there any anti-resonance axis-symmetry resonance. It is seen that suspension characteristics, being a soft clipping type which works to gradually restrict at high movement when the magnitude is symmetrical and frequencies: large, are ideal.
Page 23 FEATURES OF THE TWEETER UNIT 4) Double-damper of a push-pull structure 6) Voice coil The suspension function of dampers is to always A coil measuring 35 mm in diameter and wound of keep a voice coil centered. NF-1, the target for a 0.19 diameter wire is very large for 16 cm which is perfection of every function of it, employs speakers.
Page 24: Features Of The Enclosure
FEATURES OF THE ENCLOSURE transiency and thus in metal-specific sound. Hard ABS. Incapable of suppressing high frequency dome tweeters, therefore, are suitable for speaker vibration energy, plastic frames are usually systems where the aim is for creation of sound accompanied by undesired noise caused by resonance, and thus poor trangency.
Page 25 2) Board thickness Strength and weight are key factors for enclosures to assure optimal sound quality. Low cost enclosures allow for undesirable resonances to be generated, and, as a consequence, listeners end up with monitoring sounds that contain signals not present in the fed signals. NF-1, very unlike other 11 liter volume enclosures, uses a 21 mm thick MDF material to add extraordinary rigidity to it.
Page 26 FEATURES OF NETWORKS AND CONNECTIONS Figur17shows a case where an HP reflector is located on 3 of the interior faces of the enclosure. The use of the HP system permits time- dependent attenuation to occur gradually and consistently after a 10 m second period over the entire sound spectrum.
Page 27: Technical Specifications
a. For ideal driving of speakers, a 4-terminal structure is necessary to allow for independent connections. b. To enable connection of a single amplifier to each speaker driver, with a wire most appropriate for each speaker. c. To allow to attain, by reversing the phase, characteristics most suitable for the specificlistening environment.
Page 28 Fostex Corporation, 3-2-35 Musasino, Akisima, Tokyo, Japan 196-0021 Tel: +81(0)42-546-4974 Fax: +81(0)42-546-9222...
Page 29 FW-series FW168HR Features 145mm large ferrite magnet and Smm top • plate are employed. Besides, the copper cap is adapted onto the pole piece to re duce the magnetostriction. shape cone diaphragm is employed • to realize the weight saving and stiffness property.
Page 30 FW-series Hyperbolic Paraboloid Woofer FW168HP-X Features • 160mm (6in) cone type woofer • Hyperbolic Paraboloid (HP) dia- phragm • UDR (updown roll) tangential surround & spider • Well-tuned Qts value for richer low frequency Specifications & Thiele/Small Parameters Size mm / Voice Coil Diameter mm / Frequency Response / Impedance...
Page 31: Safety Precautions
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.
Page 32 Main features of NF-1 * An HP diaphragm of a new type is used in the 16 cm woofer. * The time-aligned enclosure structure has a baffle Sound quality of low distortion and high transition, which configuration which will prevent natural vibration noise no other diaphragms can offer, has become a reality.
Page 33: Installation Notes
* Bi-wiring/bi-amplifier system terminals <Note> To ensure ideal driving capability of each speaker When a bi-amplifier system is used, attention must be paid not to (woofer and tweeter), NF-1 has a 4-terminal base (for connect the woofer and tweeter in opposite phase. Terminals must banana shaped tips) to enable independent be securely tightened after speaker cables are connected.
Page 34: Maintenance Precaution
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.
Page 35 Service Manual Model NF-1 & NF-1A NEAR FIELD STUDIO MONITOR SPEAKER SYSTEM FOSTEX CORPORATION 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021 FOSTEX CORPORATION OF AMERICA 15431 Blackburn Ave., Norwalk, CA 90650, U.S.A. © PRINTED IN JAPAN FEB. 2000 8288790000...
Page 36 NF-1 & NF-1A NF-1 & NF-1A CAUTION: CAUTION TO PREVENT ELECTRIC SHOCK, MATCH RISK OF ELECTRIC SHOCK WIDE BLADE OF PLUG TO WIDE SLOT, DO NOT OPEN FULLY INSERT. ATTENTION: CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, POUR ÉVITER LES CHOCS ÉLECTRIQUES, DO NOT REMOVE COVER (OR BACK).
Page 37 NF-1 & NF-1A NF-1 & NF-1A TABLE OF CONTENTS 1. SPECIFICATIONS ........2.
Page 38: Circuit & Block Diagrams
NF-1 & NF-1A NF-1 & NF-1A 1. SPECIFICATIONS 4. CIRCUIT & BLOCK DIAGRAMS NF-1 Enclosure system 2-way bass-reflex system Drivers 160 mm HP woofer x 1 (low-leakage type) 20 mm Soft-Dome tweeter x 1 (low-leakage type) 8 Ω Impedance Frequency Response 50 Hz ~ 40 kHz Crossover Frequency 10 kHz...
Page 39 NF-1 & NF-1A NF-1 & NF-1A Ref. No. Part No. Description Ref. No. Part No. Description NF-1A R121 8230 1384 73 HT, Carbon, 1/4W, 47kΩ, 5% S110 8253 6550 19 SW, PL, slide, 4-3, non-shortening, Speakers R122, 123 8230 1383 02 HT, Carbon, 1/4W, 3kΩ, 5% SSSFI, L06 Enclosure system 2-way bass-reflex system...
Page 40: Controls, Indicators, And Connectors
NF-1 & NF-1A NF-1 & NF-1A NF-1A PCB Assy Parts List Ref. No. Part No. Description 2. CONTROLS, INDICATORS & CONNECTORS C503, 504 8232 8031 03 VT, CER, 50V, 0.01µF, 5%, YF • POWER AMP PCB assy NF-1A C505 8232 1461 05 VT, ALU, 50V, 1µF, 20 %, SME-VB Ref.
Page 41: Exploded View, Pcb Assembly And Parts List
NF-1 & NF-1A NF-1 & NF-1A • Parts side of SW PCB assy 3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST J001 C011 C012 PT (WHT) T1A 250V EUR/UK 3.15A 125V JPN/USA/CND • Foil side of SW PCB assy J001 C012 C011...
Page 42 NF-1 & NF-1A NF-1 & NF-1A • Foil side of Input PCB assy...
Page 43 NF-1 & NF-1A NF-1 & NF-1A • Parts side of Input PCB assy...
Page 44 NF-1 & NF-1A NF-1 & NF-1A NF-1A PCB Pattern Drawing • Parts side of Power Amp PCB assy • Foil side of Power Amp PCB assy...
Page 45 NX-Series Powered Nearfield Studio Monitors...
Page 46 Powered Nearfield Monitors for Professional Recording Environments. Listen to a pair of powered Fostex NX Series reference monitors and you’ll discover a superb natural sound with little colouration, deep tight lows and crystal clear highs, precise stereo imaging and an almost complete lack of distortion - even at high sound pressure levels.
Page 47 Electrics NX Series monitors feature internal bi- amplification utilising two high- specification, precisely calibrated units to provide excellent audio characteristics across the frequency spectrum, even at high SPLs: Low Frequency Unit: 60w High Frequency Unit 40w Both the NX-6A and NX-5A also feature large heatsinking fins enabling the NX-6A Monitor NX-5A Monitor...
Page 48 55Hz. Distributor / Authorised Dealer www.fostex.jp Fostex Company, 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021 Tel: +81 (0)42-546-4974 Fax: +81 (0)42-546-9222 In accordance with our policy of continuous development, we reserve the right to change specifications without notice. E&OE.
Page 49 III I I I I I I I United States Patent 6,134,337 [19] [l1[ Patent Number: Oct. 17, 2000 Isaka [45[ Patent: Inoue. 154 1 LOUDSPEAKER 4,086,450 4/1978 Faraone. 4,881,617 11/1989 Faraone. (75] Thkashi lsaka, Kamakura. Japan Inventor: 5,880,412 311999 Ltd., [73[ Assignees: Bell Tech Co.,...
Page 50 6,134,337 LOUDSPFAKER and large in strength, is required. Even if the diaphragm thin, the sufficient sound pressures can ensured at the lllE BACKGROUND OF INVENTION high-fr e quency region. However, in this case, the loud speaker incorporating such a diaphragm 11 can not be used Field of the Invcntion al the low-fr e quency region, and funher, it is n ry to...
Page 51 6,134,337 and. as shown in FIG. 2B, includes hyperbolas and parabo FIG. 3 is a perspective view showing a coupling portion between the diaphragm and a cylindrical member according las. Similarly, by moving the straight line BPt along the t o the first preferred embodiment o f the present invention; straight segment Pin and along the arcuate segment BA, a hyperbolic paraboloid is formed at a region defined by B, P I , FlG.
Page 52 6,134,337 attached the frame 4 at its forward end via an elastic roll at the respective positions on the peripheral edge in section. edge 41. On the other hand, the small-diameter side opening Thus, nodes are generated. edge of the diaphragm 2 is fixed onto the circumference appreciated from the foregoing description, of a cylindrical member 42 (corresponding to the foregoing diaphragm 2...
Page 53 6,134,337 of n is sel to or Jess. On the other hand. the diaphragms arranged that the diaphragm 2 and the bobbin 81 are formed shown in FIGS. 8, and 11 may also be used as being integral with each other using, for example, a titanium metal reversed.
Page 54 6,134,337 which is not located in the same plane with respect to said first segment, said first segmem baving a first end point and a middle point on said peripheral edge, said second segment first segment, said first segment having a first end point and corresponding to the center axis of said diaphragm and a middle point on said peripheral edge, said second segment substantially orthogonal to said first segmenl, said second...
Page 68 Verso Filler Page ♦ ♦...
Page 69 11 1 11 1 1 1 1 111 1 1 111 1 1 11 1 1 111 1 1 11 1 1 1 1 11 1 1 1 111 1 1 1 1 11 1 1 1 11 1 11 1 111 1 1 11 1 11 US006516077Bl United States Patent No.:...
Page 70 US 6,516,077 B1 the edge 21, a composite volume of air discharged by the ELECTROACOUSTIC TRANSDUCER up-rolled divided parts and by the down-rolled divided parts upon vibration of the diaphragm 25 will be equal throughout BACKGROUND OF THE INVENTION up and down amplitudes with respect to neutral point of no This invention relates to such electro acoustic transducers input signal, at every divided parts 22 and 23 connected to as loudspeakers or microphones and, in particular, to an...
Page 71 US 6,516,077 B1 Other objects and advantages of the present invention intervals in circumferential direction of the edge and to shall be made clear in following description detailed with respectively extend substantially along tangential lines 12 reference to accompanying drawings. with respect to inner peripheral line of the edge easy understanding of sectional shape of the divided rolled...
Page 72 US 6,516,077 B1 diaphragm edge are bulged at their surface part substan circuit can be cancelled by the slightly different shape tially from the center to the outer periphery, so that the between the up-rolled and down-rolled portions resistance increases upon downward vibratory motion, as as to reduce mainly the even higher harmonics distortion, has been disclosed.
Page 74 u.s. Patent of 6 6,516,077 Bl Feb. 4,2003 Sheet 2 FIG.3 FI G. 4 FI G. 5...
Page 75 of 6 u.s. Patent 6,516,077 Bl Feb. 4, 2003 Sheet 3 FI G.6 (PRIOR ART) ( G. 7 8(PRIOR ART)
Page 76 u.s. Patent of 6 6,516,077 Bl Feb. 4, 2003 Sheet 4 FIG.9(PRIOR ART) 20� FIG.10 (PRIOR ART) 21�...
Page 77 u.s. Patent 5 of 6 6,516,077 Bl Feb. 4, 2003 Sheet FIG.11 FIG.12 . .1 < l MAGNETIC FLUX...
Page 79 11 1 11 1 1 1 1 111 1 1 111 1 1 11 1 1 1 1 1 1 1 1 11 1 1 1 111 1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 11 1 1 1 1 1 1 11 1 11 US00694099IB2 US 6,940,991 B2 United States Patent...
Page 80 US 6,940,991 B2 unable to closely bond the tinsel cords to the damper body DAMPER FOR LOUDSPEAKER AND along the corrugations from the inner end to the outer end METHOD FOR MANUFACTURING SAME thereof, and there has been a risk of damaging the cords due to that the tinsel cords are shortened so as to be unable to TECHNICAL FIELD OF THE INVENTION move following the vibration of the damper body but to...
Page 81 US 6,940,991 B2 this case is formed by winding copper foils of a copper wire at a predetermined position on a working station by means rolled to be less than Y4 of the generant diameter less than of the notch 17. At the position where the damper body 11 0.10 mm around meta-series alamid fibers of single or twin is disposed, a projection or the like (not shown) fittable in the woven center thread of 40 count into a tinsel, and assem...
Page 82 US 6,940,991 B2 a pressure thereto; and wherein the adhesive agent acts 3. The damper for loudspeakers according to claim 1 a cushion between the damper and the tubular knitted wherein the tubular knitted tinsel cords comprise an assem tinsel cords even after being dried. bly of 4 to 16 tinsels respectively of a center thread of one 2.
Page 83 US 6,940,991 B2 u.s. Patent Sheet 1 of 3 Sep. 6, 200S F (G. 1 FIG. 2...

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