Could I Add A Port To A Sealed Box?

[Beanz]

-glue

-screws

-enough mdf/birch (NOT PLYWOOD/OSB)

-carpet/paint

-possibly resin and glassmat**

-some 2x4s or threaded rod (for bracing)**

**Note: not required but a good idea if the box is large.

well dont really need it that big since i have it in a trunk but would would be better a aero port or a sloted port?

[wL<3bass]

well dont really need it that big since i have it in a trunk but would would be better a aero port or a sloted port?

Work about the same.

[Beanz]

Work about the same.

so could i use the sealed box as like a plan and just make the new box bigger and add aero ports to it?and the aero ports would go on the top right?or would i have to start fresh?and on teh aero porst i noticed that on a pre fab box(obcon makes them)the would have two aero ports one inside and one outside is that how you do it?

Edited July 19, 2008 by Beanz

[jonathancullen89]

make sure you tune the ports lol, you cannot just add ports without calculating anything and expect results. that what happend to the guys w3's.

gotta do some math!!! =)

good luck

[Beanz]

make sure you tune the ports lol, you cannot just add ports without calculating anything and expect results. that what happend to the guys w3's.

gotta do some math!!! =)

good luck

okay so then what would i use in order to get the tuning of the ports?like is there a program that i could use?and thanks everyone for helping me out i appericate it

[E-Train]

If your wanting specs for a custom box, find someone on here in the subwoofers/enclosures thread that will come up with a design for you, thats what i did when iw as gonna get 2 l7 15's had someone design a box for me using google sketch up, all you gotta do is give them the dimensions of your trunk, and what size your subs are, what power your pushing etc..

[The Performer]

Just to be safe, you would do best to post the specs of your sub on here and have someone tell you how big to make it and how big to do the port as well.

You cant just drill out a hole in a sealed box and make it ported, sealed boxes are smaller in volume than what would be needed for a ported in most cases.

[Beanz]

Just to be safe, you would do best to post the specs of your sub on here and have someone tell you how big to make it and how big to do the port as well.

You cant just drill out a hole in a sealed box and make it ported, sealed boxes are smaller in volume than what would be needed for a ported in most cases.

If your wanting specs for a custom box, find someone on here in the subwoofers/enclosures thread that will come up with a design for you, thats what i did when iw as gonna get 2 l7 15's had someone design a box for me using google sketch up, all you gotta do is give them the dimensions of your trunk, and what size your subs are, what power your pushing etc..

then that's what ill have to do tehn but not right now cause im BROKE and in debt to be doing big thangs but thatnks though.

[MickyMcD]

Sling me the woofer model name, how big your woofer enclosure is (preferably including volume) and what style of music you listen to and I'll see what WinISD throws up mate.

Cheers,

Mick

[MickyMcD]

Here you go. WinISD has given me this information, this should work for you. If you can, try and EQ out this little rise at around 38 hz and bring 43hz up a wee bit for flat frequency response.

I have made this public so other users may comment and ammend data and designs at whim. Go nuts.

Data:

Driver : Soundstream T4

Vas : 58.7

Qts : 0.40

Fs : 34.03

SPL : 91.00

--

Project by : MICK

Project for : Beanz

--

Number of drivers : 1

Box type : Vented

Box size : 120.0 l

Tuning frequency : 32.00 Hz

Vent : 2 vent(s)

0.303 m length for each

0.100 m round

Relative

Freq Gain Phase SPL

[Hz] [dB] [deg] [dB]

20.00 -17.00 274.62 74.00

21.00 -15.11 269.85 75.89

22.00 -13.28 264.80 77.72

23.00 -11.49 259.38 79.51

24.00 -9.74 253.51 81.26

25.00 -8.04 247.07 82.96

26.00 -6.39 239.95 84.61

27.00 -4.81 232.01 86.19

28.00 -3.34 223.19 87.66

29.00 -2.02 213.47 88.98

30.00 -0.90 203.00 90.10

31.00 -0.02 192.08 90.98

32.00 0.61 181.15 91.61

33.00 0.99 170.66 91.99

34.00 1.17 160.97 92.17

35.00 1.21 152.26 92.21

36.00 1.14 144.56 92.14

37.00 1.02 137.79 92.02

38.00 0.88 131.86 91.88

39.00 0.72 126.63 91.72

40.00 0.56 122.00 91.56

41.00 0.41 117.87 91.41

42.00 0.26 114.16 91.26

43.00 0.14 110.79 91.14

44.00 0.02 107.72 91.02

45.00 -0.08 104.90 90.92

46.00 -0.18 102.30 90.82

47.00 -0.26 99.88 90.74

48.00 -0.33 97.63 90.67

49.00 -0.39 95.52 90.61

50.00 -0.45 93.53 90.55

51.00 -0.50 91.65 90.50

52.00 -0.54 89.88 90.46

53.00 -0.58 88.19 90.42

54.00 -0.61 86.59 90.39

55.00 -0.64 85.06 90.36

56.00 -0.66 83.59 90.34

57.00 -0.68 82.19 90.32

58.00 -0.69 80.84 90.31

59.00 -0.71 79.55 90.29

60.00 -0.72 78.30 90.28

61.00 -0.73 77.10 90.27

62.00 -0.73 75.94 90.27

63.00 -0.74 74.82 90.26

64.00 -0.74 73.74 90.26

65.00 -0.74 72.70 90.26

66.00 -0.75 71.68 90.25

67.00 -0.74 70.70 90.26

68.00 -0.74 69.74 90.26

69.00 -0.74 68.82 90.26

70.00 -0.74 67.92 90.26

71.00 -0.73 67.04 90.27

72.00 -0.73 66.19 90.27

73.00 -0.73 65.36 90.27

74.00 -0.72 64.56 90.28

75.00 -0.71 63.77 90.29

76.00 -0.71 63.00 90.29

77.00 -0.70 62.26 90.30

78.00 -0.70 61.53 90.30

79.00 -0.69 60.81 90.31

80.00 -0.68 60.12 90.32

81.00 -0.67 59.44 90.33

82.00 -0.67 58.78 90.33

83.00 -0.66 58.13 90.34

84.00 -0.65 57.49 90.35

85.00 -0.65 56.87 90.35

86.00 -0.64 56.27 90.36

87.00 -0.63 55.67 90.37

88.00 -0.62 55.09 90.38

89.00 -0.61 54.52 90.39

90.00 -0.61 53.97 90.39

91.00 -0.60 53.42 90.40

92.00 -0.59 52.89 90.41

93.00 -0.58 52.36 90.42

94.00 -0.58 51.85 90.42

95.00 -0.57 51.34 90.43

96.00 -0.56 50.85 90.44

97.00 -0.56 50.36 90.44

98.00 -0.55 49.89 90.45

99.00 -0.54 49.42 90.46

100.00 -0.53 48.96 90.47

Response plot:

Sorry for the long post. Overall, you need two 100mm (4") ports, 12" long each. Keep them at least 6 inches away from the walls of the enclosure and you shall be right. Critque away.

Cheers,

Mick