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Suggested/Modeled Enclosure Sizes 21_february_10

each metronome is determined by a height (L), a closed end area (So), an open end area (Sl), a driver offset (Zd), and a terminus/port size -- numbers in brown underneath are possible WxD )check to make sure driver fits). Internal imensions are given in inch2/mm2, with the aspect used in the model underneath. Circular terminus/port is diameter x length (inch/mm).


Driver

L

So

Sl

Zd

terminus


Fostex FE108ESigma

40.5625

1.65 (1,056)

34 (21,924)

14.625

2 x 3 (51x76)

<plans>

/ 1031

2.625x0.625 (66x16)

8x4.25 (203x108)

/372

 


Fostex FE126e

48/1219

3.5 (2,222)

36.5 (24,831)

20/508

2 x 3 (51x76)

 

2.8x1.25 (71x31)

7.75x4.75 (197x126)

 
Fostex FE126e Bipole

7 (4,444)

77 (49,662)

3 x 3 (76x76)

 

4x1.75 (101x44)

11x7 (279x178)

 

Fostex FE127e

48/1219

5.0/3,264

40/25,988

20/508

2 x 1.75 (51x44)

<plans>

 

2.5x2 (64x51)

7x5.75 (178x146)

 

 


Fostex FE168eSigma

60/1524

2.5/1,600

60/38,610

30/762

3 x 5 (76x127)

 

 

2.5x1 (64x25)

10x6 (254x152)

 

 


Hemp FR6.5c

60/1524

6.25/4,096

121/77,841

30/762

3 x 2 (76x51)

Stuff 0.35lbs ft^3 above the driver

2.5x2.5 (64x64)

11x11 (279x279)

 

 


Fostex FE167e

60/1524

10/6,528

70/45,212

30/762

3 x 2 (76x51)

(preferred)

 

4x2.5 (102x64)

10x7 (254x178)

 

 


Fostex FE167e

60/1524

10/6,528

123/79,250

30/762

3 x 2 (76x51)

Fostex FE207e

3 x 3 (76x76)

Hemp FR8

4x2.5 (102x64)

12.25x10 (312x254)

3 x 2 (76x51)

Pioneer B20FU20-51FW

4 x 2 (102x51)


Hemp FR8c

60/1524

7.5/4,864

196/126,672

30/762

3 x 2 (76x51)

 

 

3x2.5 (76x64)

16x12.25 (406x312)

 

 


Fostex FE208eSigma

60/1524

0/0

60/38,610

30/762

3 x 5 (76x127)

(4 ohms series resistance)

 

2.5x0 (64x0)

10x6 (254x152)

 

3 x 3 (76x76) max flat


Audio Nirvana 10"

72/1829

12/7,752

181/117,024

32/813

4 x 3 (102x76)

 

 

4x3 (102x76)

14.5x12.5 (368x318)

 

 


Lowther DX-2

60/1524

24.5/1,842

168/108,580

30/762

3 x 1.25 (76x32)

 

 

3.5x7 (89x178)

14x12 (356x305)

 

 


Audio Nirvana 12"

60/1524

60/38,608

480/309,372

30/762

3 x 1 (76x25)

 

 

10x6 (254x152)

24x20 (609x508)

 

 

Audio Nirvana 12"

60/1524

36/23,104

400/258.064

30/762

4 x 1 (102x25)

Cast Frame

 

6x6 (152x152)

20x20 (508x508)

 

 


VIFA P13W Bipole

48/1219

2.5/1,600

80/51,562

24/610

3 x 2 (76x51)

<plans>

 

1x2.5 (25x64)

8x10 (203x254)

 

 


VIFA P17

48/1219

2.5/1,600

80/51,562

24/610

3 x 2 (76x51)

 

 

1x2.5 (25x64)

8x10 (203x254)

 

 


Jordan JX92S

48/1219

2/1,275

48/30,856

24/610

2 x 5 (51x127)

 

 

1x2 (25x51)

8x6 (203x152)

 

 


CSS EL70

48/1219

12.25 /7,903

81 (52,258)

16/406

3 x 1 (76 x 26)

 

3.5 x3.5 (89x89)

9x9 (229x229)

 
CSS EL70 Bipole

25 (16,129)

144 (92,903)

4 x 0.75 (101 x19)

<plans>

5 x 5 (127x127)

12x12 (305x305)

 



21_january_07 / updated 01-september-2007


Notes:

0/ clik the links (below) to see larger, more detailed plans

1/ the terminus exit needs to have an exit to the outside world. In the examples the base of the pipe is raised by the amount of the port diameter.

2/ Feel free to play with the aspect ratio of the start & finish rectangles -- make sure you leave enough room to mount the driver & fit the magnet.

3/ A bipole can be made by taking a monopole, double So & Sl, and double the area of the port (leaving the length the same)

4/FE167e & FE207e fit in the same box (with the exception of the size of the port). Gif file is
preliminary drawing is for FE207, shorten the port to 2" (51mm) for the Hemp FR8.


Example Enclosures


Metronome v1.1 with FE108eSigma

Bipole FE126e

FE167e/207e/Hemp FR8


Suggested Baffle-Step Compensation Starting Points
(only required for monopoles)
Drivers

 

BSC (Rbs | Lbs )

Zobel (Rz | Cz )


FE108ESigma/FE126  

1.6 R + 0.5 mH

7.75 R + 0.5 uF

FE167e  

3 R + 1 mH

9 R + 5 uF

Fostex FE207e  

2.8 R + 0.9 mH

8 R + 6 uF

Audio Nirvana 10"  

4 R + 2 mH

9 R + 5 uF




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