Nakamichi SP-80

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SoCalBean420
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Nakamichi SP-80


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Couple of old school drivers. These are more of midbass than subwoofer. Both in perfect working order.

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


 



Ported Enclosure


Box Volume
(cu. ft.)



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
20181107_164035_zpsg4cjsub0.jpg
20181107_164242_zps3unzk0m3.jpg
20181107_164306_zpscdblhrod.jpg








 
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