dB Drag, Rule question.

[qtipextra 5,000+ posts]

The dBDRA defines a speaker wall as any subwoofer enclosure and / or baffle board that exceeds the height of an imaginary plane that stretches horizontally from the lowermost point of the window opening in the driver's door (where the side window enters the door frame) to the lowermost point of the window opening in the passenger's door on the opposite side of the vehicle.
Additional Guidelines:

* Compliance with this rule may be verified by using the following test: Two judges position themselves on opposite sides of the vehicle. A string (or wire) is passed through the open window on the driver's side, through the interior of the vehicle, and out of the open window on the passenger side of the vehicle. Both judges should then pull the string so that it is taught while resting against the lowest point within the window opening. If the enclosure in question does not exceed the height of this string, then the enclosure is not considered to be a wall. If any part of the enclosure exceeds the height of the string, then the enclosure is considered a wall.

* Any components that are attached to (or resting on) the subwoofer enclosure, including speakers, amplifiers, signal processors, etc., are considered to be a part of the subwoofer enclosure.

* Competitors may not deflate their rear tires or otherwise change the normal attitude of the vehicle with respect to the ground in an effort to circumvent this test.

Exceptions:

* If the subwoofer enclosure is installed in the trunk of a vehicle, then compliance with the "wall test" is not required.

Does this rule base on the height of the box from where the box rests, or from the ground? The last * (red) kind of implies that it is from the ground. That doesn't make sence either because a lifted vehicle would mean they cant have a very tall enclosure. This is why I want clarification.

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[yunvme666 10+ year member]

na as far as i know that has to do with altering the stock height of the car to keep the box under window to dash line i believe, i may be some what mistaken but i think thats it.... its to decide whether its in street or ss nw or what ever theyre callin everything this yr......

kinda look at the crxs using like 13"h boxs thats to stay under window line.....

 

[Ed Lester 10+ year member]

walls are any box that extends above the lowest point of the front windows. So if you have a lower rear end of the car than the front, it may appear to the eyes that the box is still above the window line when it may not be.

Boxes are measured in the car and have nothing to do with the ground.

 

[lilmaniac2 5,000+ posts]

truth, there is a topic on dbdrags forum ifyou could ever get it to work about how to properly measure, with pics

 

[qtipextra 5,000+ posts]

I dont think mine is considered a wall. The other day at the competition, the guy was trying to tell me that at a sanctioned event, it would be classified as a wall. My enclosure hight is only 13.5" tall. It rests on a false floor that is 5". The enclosure sits above the window line about 3". This does not classify it as a wall.

As far as I can see, the only problem I would have is the enclosure is taller then the seats (for street stock), but it still doesnts classify that as a wall, just that it doesnt qualify for street stock:

Speaker enclosures extending above the top of the front seats (excluding head rests) are prohibited.

 

[AudioXtremes 10+ year member]

Sure, its not a wall. But if its over the window line you must be in a walls allowed class.

 

[Ed Lester 10+ year member]

dB Drag classifies any enclosure over the window line as a wall. So you have a wall.

For Street Stock it cannot extend above the seats. If it is, you have a wall there too.

After looking at the pic of you Durango. You have a wall according to dB Drag rules.

 

[qtipextra 5,000+ posts]

dB Drag classifies any enclosure over the window line as a wall. So you have a wall.
For Street Stock it cannot extend above the seats. If it is, you have a wall there too.

After looking at the pic of you Durango. You have a wall according to dB Drag rules.

from the termpro db rule site: http://www.dbdrags.com/dbdrag/rules/2008/section6.asp

The dBDRA defines a speaker wall as any subwoofer enclosure and / or baffle board that exceeds the height of an imaginary plane that stretches horizontally from the lowermost point of the window opening in the driver's door (where the side window enters the door frame) to the lowermost point of the window opening in the passenger's door on the opposite side of the vehicle.

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Not diss-agreeing, just confused. Nowhere on those rules does it say anything about the window line. According to the rules listed there, it is also not a wall, as the height is only 18" total, and from window to window is 62"

 

[--Navi-- 10+ year member]

your box is three inches above the window line from what you posted. that means it has to break the plain of the window line at it lowest point .

 

[qtipextra 5,000+ posts]

your box is three inches above the window line from what you posted. that means it has to break the plain of the window line at it lowest point .

But that doest classify it as a wall. It means I could not compete in street stock, but its still not a wall. I think someone said it best: Not a wall, but has to be in class where wall is allowed.