Port distance from rear hatch

[Buck 5,000+ posts]

Now I've heard all sort of things about how for how far the port of a box should be away from a hatch, you know, some say the diameter of the port or half of the diameter of the port, but yet I've seen as little as 2 inches work and be crazy loud. So I'm wondering, how far? Say if I had a box that had 4 6" aeros at the bottom, how far away should it be from the rear hatch? 2", 4", 6", or what? Every inch closer I can make it, the more room I have else where. Vehicle is an '03 Exploder.

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[ahole-ic]

Now I've heard all sort of things about how for how far the port of a box should be away from a hatch, you know, some say the diameter of the port or half of the diameter of the port, but yet I've seen as little as 2 inches work and be crazy loud. So I'm wondering, how far? Say if I had a box that had 4 6" aeros at the bottom, how far away should it be from the rear hatch? 2", 4", 6", or what? Every inch closer I can make it, the more room I have else where. Vehicle is an '03 Exploder.

If anyone actually gives you a specific answer do not listen to them. Here's why. It has been proven that the relationship of the port to the rear hatch can manipulate the phasing of the rear and forward wave. The rear hatch can ALSO act as more port length. What does this mean? There IS a too close, and there is a too far. It's up to you to find what is "just right".

 

[Buck 5,000+ posts]

Well, I'd like to guesstimate what's right before I build the box. I don't have the budget to do testing. That's why I'm asking.

 

[ahole-ic]

Well, I'd like to guesstimate what's right before I build the box. I don't have the budget to do testing. That's why I'm asking.

Your guess is as good as anyone else's honestly.

 

[Buck 5,000+ posts]

Can you explain the technical side of that any? I understand how it could make the port longer and change tuning, but you explain how it manipulate the phasing? (theoretically)

 

[ahole-ic]

Can you explain the technical side of that any? I understand how it could make the port longer and change tuning, but you explain how it manipulate the phasing? (theoretically)

Sure. The forward wave is created by the sub. The rearward wave is coming from the port. Since they are oscillating at different times, even on the same plane, the same distance away from an object they will be phased differently upon arrival. The proximity to the hatch controls the distance that wave travels. Shortening or elongating that distance will change its relationship with the forward wave either moving it farther out of or in phase with it.

 

[nateberrier 10+ year member]

off topic, but ecrack i really dont want to mess with any girl that can one arm a sub like that lol

 

[ahole-ic]

off topic, but ecrack i really dont want to mess with any girl that can one arm a sub like that lol

Olivia Munn? She could pick up a monster truck and throw it at Jesus and I'd still fuck her til she died.

 

[stangman67 10+ year member]

photochopped

 

[Buck 5,000+ posts]

Sure. The forward wave is created by the sub. The rearward wave is coming from the port. Since they are oscillating at different times, even on the same plane, the same distance away from an object they will be phased differently upon arrival. The proximity to the hatch controls the distance that wave travels. Shortening or elongating that distance will change its relationship with the forward wave either moving it farther out of or in phase with it.

What effect does that have on music? And how noticeable is it?

off topic, but ecrack i really dont want to mess with any girl that can one arm a sub like that lol

I'm 99% sure that's photoshopped. If not, me neither //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[stangman67 10+ year member]

definite photochop http://www.oliviamunn.com/wp-content/gallery/astronaut-gallery/olivia-munn-astronaut-gallery-1.jpg

 

[ahole-ic]

What effect does that have on music? And how noticeable is it?

Any time there are phasing issues it is going to reduce output. I don't think it's significant enough that you'd notice it with your ears.

 

[KRYPTO 10+ year member]

WOW you post thread and get 10 replies in less then 30min and min sits all day with nothing lol

 

[ahole-ic]

definite photochop http://www.oliviamunn.com/wp-content/gallery/astronaut-gallery/olivia-munn-astronaut-gallery-1.jpg

Super slueth on the case!

 

[Buck 5,000+ posts]

Any time there are phasing issues it is going to reduce output. I don't think it's significant enough that you'd notice it with your ears.

Ok, so that would be more of a SPL worry if I was looking for every db possible?