my first subwoofer box
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=99967
Printed Date: May 11, 2024 at 5:55 PM
Topic: my first subwoofer box
Posted By: djspoe
Subject: my first subwoofer box
Date Posted: December 13, 2007 at 12:57 AM
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
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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
Replies:
Posted By: djspoe
Date Posted: December 13, 2007 at 12:59 AM
Sorry my ports will be 2 Port Dia. 3.0 in port length 6.0 in Each
Posted By: djspoe
Date Posted: December 13, 2007 at 8:59 AM
any info?
Posted By: aznboi3644
Date Posted: December 13, 2007 at 9:28 AM
how to design one or how to build a box??
Posted By: djspoe
Date Posted: December 13, 2007 at 10:26 AM
I guess both I want to desing a box to build it LOL
Posted By: djspoe
Date Posted: December 13, 2007 at 9:10 PM
Sorry to bother but help PLEASE
Posted By: stevdart
Date Posted: December 13, 2007 at 10:07 PM
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.
Posted By: djspoe
Date Posted: December 13, 2007 at 10:25 PM
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
Posted By: stevdart
Date Posted: December 13, 2007 at 10:31 PM
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.  ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: djspoe
Date Posted: December 13, 2007 at 10:50 PM
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 
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 
Posted By: stevdart
Date Posted: December 13, 2007 at 11:04 PM
Since you already have this 2 channel amp and not a mono amp, you will have to wire those subs in series to make 8 ohms. Bridge the 8 ohm load according to the amp instructions. The wiring is shown in the second diagram of the link I gave you above.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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