my first subwoofer box

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djspoe

Member - Posts: 11

Joined: December 11, 2007

Posted: December 13, 2007 at 12:57 AM / IP Logged

Thanks for your support

Excuse my english

I Will Like To know how to make a Ported Box for my 2 rockford fosgate P1S412

They are 150 rms each (cheap i know)

i dont have any experience with car audio but I will like to learn.

I have been using WinISD and this is what I got

---------------------------------------------------------------------------------------------------

Driver : P1S412

Project by : Dj Spoe

Project for : you

Number of drivers : 2

Box type : Vented

Box size : 101.4 l W:19.57 in x H:30.71 in x D:12.13 in

Tuning frequency : 34.40 Hz

Vent : 1 vent(s)

0.056 m length for each

0.076 m round

Relative

Freq Gain SPL

[Hz] [dB] [dB]

20.00 -14.74 74.27

25.00 -9.57 79.44

30.00 -5.54 83.47

35.00 -2.08 86.93

40.00 0.86 89.88

45.00 3.08 92.09

50.00 4.32 93.33

55.00 4.66 93.67

60.00 4.47 93.48

65.00 4.07 93.08

70.00 3.63 92.64

75.00 3.22 92.23

80.00 2.86 91.87

85.00 2.54 91.55

90.00 2.27 91.28

95.00 2.04 91.05

100.00 1.84 90.85

-------------------------------------------------------------------------------------

Am I doing everything correct?

Thanks

djspoe

Member - Posts: 11

Joined: December 11, 2007

Posted: December 13, 2007 at 12:59 AM / IP Logged

Sorry my ports will be 2

Port Dia. 3.0 in

port length 6.0 in

Each

djspoe

Member - Posts: 11

Joined: December 11, 2007

Posted: December 13, 2007 at 8:59 AM / IP Logged

any info?

aznboi3644

Gold - Posts: 2,600

This member consistently provides reliable information

Joined: May 01, 2006

Location: United States

Posted: December 13, 2007 at 9:28 AM / IP Logged

how to design one or how to build a box??

djspoe

Member - Posts: 11

Joined: December 11, 2007

Posted: December 13, 2007 at 10:26 AM / IP Logged

I guess both

I want to desing a box to build it

LOL

djspoe

Member - Posts: 11

Joined: December 11, 2007

Posted: December 13, 2007 at 9:10 PM / IP Logged

Sorry to bother but help PLEASE

stevdart

Platinum - Posts: 5,816

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: December 13, 2007 at 10:07 PM / IP Logged

Build a sealed box per the recommendations in the manual. It shows 1 cubic foot for each sub. Wire the two subs in parallel to make a 2 ohm impedance and use a small mono amplifier for power.

According to this page, it is a single voice coil subwoofer. The manual says DVC. I don't know which it is, but you should if you have the subs. Find wiring appropriate for your application in the linked wiring info.

You would be better off using these subs in a sealed box, as that is what they will work best in. Forget about working on a vented box for them.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

djspoe

Member - Posts: 11

Joined: December 11, 2007

Posted: December 13, 2007 at 10:25 PM / IP Logged

They are SVC 4 Ohm Each

But which will be the diference between a sealed box VS a Ported Box ?

According with WinISD i will get more power from a ported box

Sorry I am New

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: December 13, 2007 at 10:31 PM / IP Logged

The difference is the quality of the sound. If you want really loud you would not be using subs that have a short Xmax and low power handling capacity. Do them and yourself justice and put them in the type of box they will perform best in. They have a Qts of .54 and EBP in the low 40's, perfect for sealed.

No need to be sorry. I know you're new. my first subwoofer box -- posted image.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

djspoe

Member - Posts: 11

Joined: December 11, 2007

Posted: December 13, 2007 at 10:50 PM / IP Logged

Thanks for your help I will try both, sorry one more question

about the Subwoofer Wiring , how should I wire them?

2 ohm or 4 ohm? they are 150 RMS per coil With a Single coil each

I have a cheap amp a NITRO 1200 WATT 2-CH POWER AMPLIFIER BMW-484

my first subwoofer box -- posted image.

MOSFET BRIDGEABLE AMPLIFIER

MODEL BMW-484

1200 WATT MOSFET BRIDGEABLE AMPLIFIER

SUPER HIGH FIDELITY SOUND

BUILT IN FULL CROSSOVER SYSTEM

VARIABLE LOW PASS FILTER 30Hz-250Hz

VARIABLE HIGH PASS FILTER 50Hz-1KHz

VARIABLE BASS BOOST (0-18dB)

VARIABLE GAIN CONTROL

2-8 OHM LOAD CAPABILITY

MONO BRIDGEABLE DESIGN

MOSFET REGULATED POWER SUPPLY

3-WAY PROTECTION WITH L.E.D. INDICATOR

FREQUENCY RESPONSE: 20Hz-30KHz

LESS THAN 0.03% THD

HIGH/LOW IMPEDANCE INPUT

45 DEGREE POWER AND SPEAKER CONNECTOR

GOLD PLATED RCA, POWER AND SPEAKER TERMINALS

I dont remember the RMS my first subwoofer box -- posted image.

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