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Old 07-17-2013, 05:24 PM
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Default Ideas for sub box - no name subs but have T/S parameters

I have 2 12" subs laying around that haven't been used in a while and I wanted to build a quick box for them. I usually find box ideas on this website or other forums for whatever subs I have but these are a no-name sub so I have no idea what kind of box to build for them. They have always been in a simple ported box, 3.5 cu ft tuned to 35hz, but this box doesn't fit in my 02 Grand Prix. At first I was going to just build a box to that size/tune but make give it a smaller height so it will fit but I decided to maybe try something new depending on what kind of ideas I get from you guys. I will post the specs to the sub below, but I want to figure out if maybe it will sound
in a different size box, tuned different, or even in a 4th/6th order bandpass. I know bandpass boxes are hard to build but I did one for my SA-8V2 and I love it. I know the box has to be built right and made for the sub so if anybody knows if with these specs if it would sound good that would be awesome. Any ideas are greatly appreciated. I was also thinking about porting through my rear deck or my ski hole in my rear seat. I've tried some calculators but get some crazy numbers like 104 cu ft for ported.

12" sub specs:
500-watt rms
Resonance Frequency (fs): 30HZ
Sensitivity (SPLo): 90 DB @ 1Watt
Effective Piston Area (SD): 77.923
Effective Frequency Range: 25-1000
Effective Excursion (EXMax): .505 in
DC Resistance (RE): 7 Ohms in series
Voice Coil Inductance (LE): 5.7 Mh
Voice Coil Diameter (d): 2.5"
Voice Coil Length (h): 1.118"
Mechanical Q Factor (Qms): 8.593
Electrical Q Factor (Qes): .588
Total Q Factor (Qts): .550
Force Factor (BL): 16.506 TM
Equivalent Volume (VAS): 72.933 cu ft
Moving Mass (Mms): 3.763 oz
Net Displacement: 135 cu in
Magnet Weight: 66.9 oz
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Old 07-17-2013, 05:58 PM
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Or if someone here designs them cheap?
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Old 07-17-2013, 06:45 PM
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I know you say no name subs, but some of us on here have worked w a broad variety of diff brands.
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Old 07-17-2013, 07:03 PM
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go with what you know.(try to duplicate the airspace you are used to hearing them in)


they would 'like' about 30 cu ft per sub

infinite baffle wouldn't be horrible.


def not worth paying for a design for them. [or just pay for a design which will work well for subs you might someday purchase instead]
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Old 07-17-2013, 09:56 PM
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Quote:
Originally Posted by Todd Dupler View Post
I know you say no name subs, but some of us on here have worked w a broad variety of diff brands.
They are called DJL Pops made in Chicago
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Old 07-17-2013, 09:58 PM
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Quote:
Originally Posted by iamsonic View Post
go with what you know.(try to duplicate the airspace you are used to hearing them in)


they would 'like' about 30 cu ft per sub

infinite baffle wouldn't be horrible.


def not worth paying for a design for them. [or just pay for a design which will work well for subs you might someday purchase instead]
Every other sub I have is Sundown and I have no problem finding designs for them lol... I have them in 1.75 cu ported per sub and they sound pretty good but I was hoping to get a little more input as far as maybe doing a 4th order and port through my rear deck or ski-hole in between my rear seats
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Old 07-17-2013, 10:23 PM
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They aren't modeling out well in less than 3.5 cubic feet. If you are willing to run them in a clamshell iso 4th, they look to be good in 1.5 sealed + .8 ported tuned to 60 with a 2"w x 14"h x 21"L vent. This yields +/-3db in car response from about 20hz to 70hz and +/-1db from about 25hz to 60hz.
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Old 07-17-2013, 10:48 PM
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Quote:
Originally Posted by hurrication View Post
They aren't modeling out well in less than 3.5 cubic feet. If you are willing to run them in a clamshell iso 4th, they look to be good in 1.5 sealed + .8 ported tuned to 60 with a 2"w x 14"h x 21"L vent. This yields +/-3db in car response from about 20hz to 70hz and +/-1db from about 25hz to 60hz.
First of all, thank you very much!

Now a few more questions (I apologize some might be dumb questions). Clamshell Iso would mean cone to cone correct? Also, how are the subs screwed down when mounted like this? Do I leave a gap in between the subs?

On this link: Car Audio Subwoofer Enclosures Fourth Order/Bass Reflex and Bandpass would it be the isobaric single reflex bandpass enclosure?

Last but not least, is it possible to have the port outside of the box so that I can port it through my rear deck?

Thanks again
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Old 07-18-2013, 12:11 AM
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Yes, it would be "isobaric single reflex bandpass" from that site. You only need enough space between the subs so that the surrounds do not touch, but the seal between them is pretty important. Yeah, you can do an external vent up through your rear deck. A 6" round vent with one flared end 22" in length would be the equivalent to the square vent.
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Old 07-18-2013, 07:15 AM
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Quote:
Originally Posted by hurrication View Post
Yes, it would be "isobaric single reflex bandpass" from that site. You only need enough space between the subs so that the surrounds do not touch, but the seal between them is pretty important. Yeah, you can do an external vent up through your rear deck. A 6" round vent with one flared end 22" in length would be the equivalent to the square vent.
Hurrication, thank you very much! Hopefully I can get this done this weekend
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