Box for 15" Avas

[onebadmonte 235]

I've got a pair of 15" Avalanche subs. I want to build a box, but I don't know what size it needs to be. I'm undecided on whether I'll be using them in my home or my car. My car needs a little work, that's why I'm undecided. Anyways to the good stuff. I want to go ported for either application. For the car I'm guessing a tuning frequency of 32 to 35Hz. For the house I'm thinking 28Hz. I'm open to suggestions. For power I've got two TMA 1000.1 in the car. Oh, by the way the ride is an 86 Mustang GT hatchback, the rear seat isn't used so it's folded down flat. The subs would be wired to 1 ohm each, one sub per amp. In the house I've got a Behringer EP2500. The subs would be wired 4 ohms each, one sub per channel. Thanks!

[Duke 0]

I've got a pair of 15" Avalanche subs. I want to build a box, but I don't know what size it needs to be. I'm undecided on whether I'll be using them in my home or my car. My car needs a little work, that's why I'm undecided. Anyways to the good stuff. I want to go ported for either application. For the car I'm guessing a tuning frequency of 32 to 35Hz. For the house I'm thinking 28Hz. I'm open to suggestions. For power I've got two TMA 1000.1 in the car. Oh, by the way the ride is an 86 Mustang GT hatchback, the rear seat isn't used so it's folded down flat. The subs would be wired to 1 ohm each, one sub per amp. In the house I've got a Behringer EP2500. The subs would be wired 4 ohms each, one sub per channel. Thanks!

How much space do you have to work with in your car?

[onebadmonte 235]

I've got a pair of 15" Avalanche subs. I want to build a box, but I don't know what size it needs to be. I'm undecided on whether I'll be using them in my home or my car. My car needs a little work, that's why I'm undecided. Anyways to the good stuff. I want to go ported for either application. For the car I'm guessing a tuning frequency of 32 to 35Hz. For the house I'm thinking 28Hz. I'm open to suggestions. For power I've got two TMA 1000.1 in the car. Oh, by the way the ride is an 86 Mustang GT hatchback, the rear seat isn't used so it's folded down flat. The subs would be wired to 1 ohm each, one sub per amp. In the house I've got a Behringer EP2500. The subs would be wired 4 ohms each, one sub per channel. Thanks!

How much space do you have to work with in your car?

The floor of the hatch area measures 36" wide and 30" from the rear of the car to the rear seat backs when the rear seats are up. If the rear seat is down then the length is about 52" from the rear of the car to the back of the front seat. The height goes like this, starting from the rear of the vehicle, the first 14" of length the box can be up to 11" in height. There after the box can go up to 14" in height. If I'm doing my math right, accounting for 3/4" MDF no bracing no nothing, from the numbers I listed @ the 52" length the box would be about 11-3/4 ft^3 at the 30" length the box would be 6-1/4 ft^3.

[cecaa850 0]

Are you going to use it for music only if it were go in your house? If it's going to have HT duties, I'd think that tuning the box to 28Hz would be way too high. I'd tune to 20 or lower.

[onebadmonte 235]

Are you going to use it for music only if it were go in your house? If it's going to have HT duties, I'd think that tuning the box to 28Hz would be way too high. I'd tune to 20 or lower.

I picked that frequency because I have a pair of Tang Band eights tuned to that frequency and they do pretty good. If I can tune lower with the Ava, then I'd go with it. At home I'd use it more for movies than music.

[cecaa850 0]

I guess you need to figure out where you want to use them and go from there.

[onebadmonte 235]

I guess you need to figure out where you want to use them and go from there.

I was hoping on using box requirements for each application to help me decide on which direction to go with these subs. Thanks.

[Duke 0]

I guess you need to figure out where you want to use them and go from there.

I was hoping on using box requirements for each application to help me decide on which direction to go with these subs. Thanks.

Well, for your car, I'd go as big as you can go with at least 1/3 SD for port area, tuning it to about 30. Even tuning higher up if you can't fit a very long port isn't going to be that bad as the Avalanches have a naturally heavy low end, and the high end is weaker. Might even it out a bit.

[onebadmonte 235]

I guess you need to figure out where you want to use them and go from there.

I was hoping on using box requirements for each application to help me decide on which direction to go with these subs. Thanks.

Well, for your car, I'd go as big as you can go with at least 1/3 SD for port area, tuning it to about 30. Even tuning higher up if you can't fit a very long port isn't going to be that bad as the Avalanches have a naturally heavy low end, and the high end is weaker. Might even it out a bit.

Interesting, I've never heard of using a minimum of 1/3 SD for port area. What would be the maximum of SD to use for port area? Also, what would be the formula to figure out port length if I went this route? Thanks for the advise.