Subs MUCH louder with trunk open (mid mounted box)

[djbass101 10+ year member]

I have tried to go through the forum to find a solution to my problem, and tried a couple things dealing with cancellation (stuffed my trunk full of foam just to see if it would help), and I cannot figure this one out. I have made 3 different boxes (this one I finally found the specs to what my subs want for optimal), and I don't think it is my "box" per-say that is the problem as when I pop my trunk lid (opens only maybe 2 inches or so) it is like I have awakened the gods and shakes everything. I am running 4 10" and have included a crude MSPaint drawing to maybe help.

I am wondering if they were ported to the back that would fix it, or *sigh* do I need to move the box to the trunk and fire the ports forward.

If anyone can help I would appreciate it, I have spent way too much time and have admitted defeat.

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[KyleBechtold 5,000+ posts]

it lets it breath more.. its the same effect of opening your door with it sealed forward..

 

[budahbuddy803 10+ year member]

that drawing just confuses me. is the box in the trunk or in the back seat area?

 

[djbass101 10+ year member]

it is in the back seat area. Opening the doors or windows doesn't help a lick, but popping trunk makes the world of difference.

 

[djbass101 10+ year member]

the seat that is labeled is the front seats... the back seats have been removed and the box build in place

 

[djbass101 10+ year member]

the "large opening" is just meaning that without the seats the trunk and cab are not separated by anything (seats or baffle or anything)

 

[cthedinger 10+ year member]

Will you post some pictures up of where the box is? If its the way I think it is I know your problem.

 

[djbass101 10+ year member]

lemme grab some pics right now for yah

 

[goingdef 10+ year member]

If you put the enclosure in the trunk firing at the lid that would be loudest I ran a 15" T2 in the backseat just to see what it would do and it was like a had a ten.

 

[djbass101 10+ year member]

I know the box is not pretty, but again because this is box #3 I have been trying to get something that sounds good and work on finishing after.

 

[djbass101 10+ year member]

@goingdef - now if they are firing at the trunk, is my port facing forward (towards the cab) fine, since I cannot fire the port up with this box because of port length issues.

 

[HO-AUDIO 10+ year member]

All the bass is getting trapped in the trunk area close the box off from the trunk and your problem should be gone

 

[djbass101 10+ year member]

All the bass is getting trapped in the trunk area close the box off from the trunk and your problem should be gone

now when you mean close the trunk area off, are you just talking about from air (making the seal air tight between the cab and trunk), or do I need to find some fancy way of deadening the sound waves going to the trunk.

 

[djbass101 10+ year member]

also thinking about that if giving them more air is what they need then I don't think making their usable cab airspace smaller would help.. but then again I can be wrong as I have found //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[SQ Monte 10+ year member]

It's cause you have massive cancellation/standing waves in the trunk since it's not sealed off. Seal up your rear deck and the trunk from your box and you'll be good to go.