building 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=120581
Printed Date: May 05, 2024 at 5:04 AM

Topic: building box

Posted By: gbodyera
Subject: building box
Date Posted: March 07, 2010 at 8:12 PM

Okay. Im wondering which kind of box will give me more bass. Ported or sealed. ANyway, Im getting ready to build a box for my 3 12's. Theyre Dual 4ohm's. 300watts rms/ 600 max each. Anyone have any dimensions for building this box for the best/loudest bass possible? Please help. Thanks

Also I plan on using 3/4'' MDF but dont know if I nail it or what. What type of caulking is used in the seams?

Replies:

Posted By: anonymous1
Date Posted: March 07, 2010 at 9:15 PM

What vehicle will this enclosure live in? Do you have some maximum dimension based on vehicle space restrictions?

The dimensions on the box are determined by the specifications of the subs from the mfr.

You need to know what those specs are in order to calculate how to properly tune the enclosure.

Once you have some figures to work with, you may use the online resources or some software to determine the encloser size for either ported or closed.

In this process you will know what size and length tube you need.

https://www.the12volt.com/caraudio/boxcalcs.asp

https://www.the12volt.com/caraudio/thiele.asp

https://www.the12volt.com/installbay/forum_posts.asp~TID~74558~PN~1

IMHO, once you know roughly what size enclosure you will need for each sub, you may want to consider buying one.

Posted By: whiterob
Date Posted: March 07, 2010 at 9:20 PM

What specific subs are you using? A model number would help unless you have the T/S parameters of the sub. The enclosure you should have is based on what specific sub you are using.

Ported is typically louder but it depends on what sub you are using. Not all subs work well in ported and not all work well in sealed enclosures.

Posted By: gbodyera
Date Posted: March 07, 2010 at 11:21 PM

Its for an 82 Cutlass so I can fit any kind of box in it. Theres lots of space.

MODEL: HFI12D4

Posted By: anonymous1
Date Posted: March 08, 2010 at 12:04 AM

Hifonics HFi 12D4 12" Dual 4 ohm Subwoofer

Subwoofer Specifications
Subwoofer Size	12"
Subwoofer Design	Round / Circle
Main Cone Color	Black
Voice Coil(s)	Dual (2 voice coils)
Impedance (per voice coil)	4 ohms
Peak Power Handling	600 watts
RMS Power Handling	300 watts
Woofer Composition	Injection Molded Polypropylene (IMPP)
Woofer Surround	Rubber
Minimum Sealed Box Volume	1.25 cubic feet
Maximum Sealed Box Volume	2.15 cubic feet
Minimum Ported Box Volume	1.75 cubic feet
Maximum Ported Box Volume	2.5 cubic feet
Sensitivity	88 dB
Frequency Response	N/A
Xmax (millimeters)	11 mm
Top Mount Depth	5-3/4"
Shallow Mount Installation	No
Cutout Diameter	N/A
Recommended Enclosure Type	Ported / Vented Sealed
Subwoofer Grille	No
Re-Cone Kit Available	No

Google for enclosures that fall in the middle of the recommendations. See the specs for min\max? Try to find something in the middle, like 1.75cu' etc.

Even in the trunk of a car you should anchor them.

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I know just enough to be dangerous. VERY dangerous.

Posted By: haemphyst
Date Posted: March 08, 2010 at 10:39 AM

I smell cheese...

As in "cheesy woofer".

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Posted By: KPierson
Date Posted: March 08, 2010 at 11:42 AM

I would do three seperate 2 cu ft sealed boxes with either three seperate 300wrms amps or one 1 ohm stable 900 wrms amp.

I would crown staple the pieces of the enclosure together. If you don't have an air compressor and a crown stapler I would just 1 1/2" drywall screws - make sure you drill pilot holes and countersink each hole.

I would use elmers glue to glue the seams together then I would use liquid nails to line all the internal seams.

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Kevin Pierson