designing sub enclosure?
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=77075
Printed Date: May 03, 2024 at 12:41 PM
Topic: designing sub enclosure?
Posted By: mobilesndfx
Subject: designing sub enclosure?
Date Posted: April 30, 2006 at 8:37 PM
I have 3 JL Audio 10w3v2-D4 subs. I want to mount them so that the front of the subs fire into the enclosure and the magnets are outside of the enclosure. My question is, Im designing a sealed enclosure, is it the same formula for box volume as if I were mounting them in the traditional method or is there a different formula?
Replies:
Posted By: arrow12
Date Posted: April 30, 2006 at 9:24 PM
It's the same formula, but there will be a little extra space. This is do to the fact that you don't have a magnet and other structures in the box.
-------------
That's my opinion. Take it, leave it, or correct me.
Posted By: aznboi3644
Date Posted: May 01, 2006 at 9:00 PM
Having the magnets facing out will actually make the box fabrication easier. there is no need to calculate the volume that the motor assembly occupies. So the box will be more exact to the subs specs.
Posted By: mobilesndfx
Date Posted: May 01, 2006 at 9:04 PM
I heard they need to be wired reverse polarity, whats your opinion?
Posted By: stevdart
Date Posted: May 01, 2006 at 9:56 PM
Not if all the subs are inverted. You can reverse polarity to the set by switching + and - at the amp speaker terminals. This is something everybody should experiment with when setting up a system, whether the subs are normal or inverted. Choose the way which makes the subs louder and deeper. Some amplifiers have a "180" switch for this very reason. Only if you had a setup where two of the subs faced one way and one faced the other way would you need to do some special reverse wiring on the subs themselves. ------------- 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: mobilesndfx
Date Posted: May 03, 2006 at 7:39 PM
Thats what I thought. I asked this same question in another forum and I got the response " you need to reverse polarity wire them so that the subs fire out of the box". That made no sense to me at all. Thanks, you gave me a good idea on facing 2 subs one direction and the third the other direction.
Posted By: stevdart
Date Posted: May 03, 2006 at 9:35 PM
Here's an example of one sub wired in reverse of the other two subs. This example shows DVC subs, but the concept remains the same with SVCs. It doesn't matter if one sub is inverted and the other two normal...or one normal and the other two inverted. You would wire the set this way in either case, because you can always reverse polarity at the amp. Always find the simplest way to wire the subs knowing you have that 'reverse at the amp' option. This is series / parallel. If these were DVC 4 ohm subs the net result would be 2.67 ohms. 
------------- 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: mobilesndfx
Date Posted: May 04, 2006 at 6:31 PM
Great, thats exactly how Im going to run them. Whats the best way to seal plexi to MDF?
Posted By: austincustoms
Date Posted: May 04, 2006 at 7:49 PM
What is the purpose of the plexi? if it's just a decorative covering, double stick tape, screws, or spray adhesive will do. If it's structural IE, a window, screws every 2 inches + silicone caulking will do.
|