Dimensions 21cm x 40cm x 90cm Driver Fostex FF125K Air cell capacity 2.8 Liter The throat cross-sectional area (, contraction percentage) 54cm 2 (81%) Horn length 270cm (with horn central line calculation) Opening area 423 cm 2

 

     (1) fill the glass wool or dry sand in the space enclosed by #18-20 board tightly. Never keep vacant.
     (2) place the damping material on the board #2. (He used to use the glass wool)
     (3) fill the sand at the bottom #11-15 forming the step shape.
     (4) put the thin cloth on #12-15 to prevent the reflections.

     Since Mr. Nagaoka used to say you can use any damping material you like (your decision), I think the glass wool
     would be just example.

D-100

Length of straight tube  (Cm)	Entrance side position  (Cm)	Exit side position  (Cm)	Cross-sectional area  (Cm 2 )
31.0	0.0	31.0	54.0
25.0	31.0	56.0	63.0
29.5	56.0	85.5	81.0
29.5	85.5	115.0	108.0
15.0	115.0	130.0	144.0
42.0	130.0	172.0	162.0
67.3	172.0	239.3	234.0
30.5	239.3	269.8	423.0

Original information >>>http://www2.nkansai.ne.jp/hotel/nakanou/d-100.htm
 More information >>>http://www1.kcn.ne.jp/~bamba/simulation/D-100_BR.html
 
 

The Driver
 

Furthermore high grade it added the sound quality to the high efficiency where as for up-to-date version of the FF series, adopting the cone paper which utilizes the new material, the former model possessed.  The material of the cone paper, in the fiber of the non- lumber raw materials " kenaf " which are not depleted the forest resource, depends on advanced biotechnology technology, " the bio cellulose " fiber is combined appropriately, high-level paper making technology is freely used, efficiency is made to fuse with the sound which each material possesses. Introducing the new material into also the material of the edge, it built up the cone paper for the new FF series.   It is superior in expression power of vocal zone, hears with natural and becomes tired and it possesses the sound quality which is not the present " the kenaf " and, quite being delicate, the smooth treble can be played back finely together to have the sound quality of the " bio cellulose ", resolution to be high as for rich new FF sound of the amount of information, it responds to wide expression from the jazz * lock to the pop * classic, is the full range unit where the fresh sound making is possible with real "Kenaf " and " bio cellulose "  It is 1 year fresh forage plant which attaches the flower where " the kenaf " belongs to mallow course and is similar to the confederate rose. Because growth quite to be quick cultivation is easy, it is observed worldwide as the non- wood pulp raw materials which are not depleted the forest resource. As raw materials of the cone paper of the speaker good efficiency is had, propagation velocity of sound is quicker than the former wood pulp, internal loss possesses the value of the same.  Not only physical properties value and we are superior even in the sound quality, expression power of the mediant limits being rich and the vocal fundamental tone being clear in whole with thickness beautifully, it is appraised resolution is good.  Up-to-date biotechnology was produced, as for " the bio cellulose " fiber, the thickness 1 20 - the 50nm (nano- meter) is the super superfine fiber. This fiber purity is high, there is no impurity and shives and specks almost with the alpha cellulose, has shown crystallinity of the highest level.  When it utilizes in the diaphragm of the speaker, young's modulus to be high be able to produce the cone paper whose propagation velocity is quick, the efficiency which is superior in playback of the middle treble limits is shown. To the treble limits the frequency characteristic which extends gently and, quite being delicate, clearing it had the sound quality finely, you can obtain the playback sound where the reality is high..