Nakamichi SP-80
fs = 40Hz
Qt = .255
Qes = .268
Qms = 5.29
Vas = 1.08 cu. ft. = 1866 cu in. = 30.58 liters
Xmax = .28 in = 7.0 mm
Vd = 0.00385 cu ft. = 6.65 cu in. = .11 liters
Speaker Displacement = .046 cu ft. = 80 cu in. = 1.31 liters
Re = 4.5Ohms
No = .9%
Par (Vented) = 3.0 x (Vd)^2 x (f3)^4 = 3.63e-8 x (f3)^4
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Ported Enclosure
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||||||||||
|
Box Volume |
f3 (Hz)
|
fb (Hz) |
ripple (dB)
|
Par (W)
|
2 Inch
|
P.V.
(cu in) |
2.5 Inch |
P.V.
(cu in) |
3.0 Inch
|
P.V.
(cu in) |
|
0.20
|
95.30
|
73.80
|
1.20
|
2.99
|
8.82
|
28
|
14.23
|
70
|
20.94
|
148
|
|
0.30
|
76.20
|
63.00
|
-0.10
|
1.22
|
7.00
|
22
|
11.4
|
56
|
16.85
|
119
|
|
0.40
|
65.70
|
56.70
|
-1.00
|
0.68
|
6.00
|
19
|
9.83
|
48
|
14.60
|
103
|
|
0.50
|
58.80
|
52.50
|
-1.60
|
0.43
|
5.31
|
17
|
8.75
|
43
|
13.04
|
92
|
|
0.60
|
53.80
|
49.30
|
-2.20
|
0.30
|
4.82
|
15
|
7.99
|
39
|
11.94
|
84
|
|
0.70
|
50.00
|
46.80
|
-2.60
|
0.23
|
4.44
|
14
|
7.39
|
36
|
11.08
|
78
|
|
0.80
|
47.00
|
44.80
|
-3.00
|
0.18
|
4.12
|
13
|
6.89
|
34
|
10.36
|
73
|
|
0.90
|
44.40
|
43.10
|
-3.30
|
0.14
|
3.86
|
12
|
6.48
|
32
|
9.77
|
69
|
|
1.00
|
42.30
|
41.60
|
-3.60
|
0.12
|
3.65
|
11
|
6.15
|
30
|
9.30
|
66
|
|
1.10
|
40.50
|
41.00
|
-3.80
|
0.10
|
3.44
|
11
|
5.83
|
29
|
8.83
|
62
|
|
1.20
|
38.90
|
39.20
|
-4.10
|
0.08
|
3.29
|
10
|
5.60
|
27
|
8.50
|
60
|