Would this work?

[Buck 5,000+ posts]

these were two alpine type s 10's. probably an extended cab full size truck.

 

[Buck 5,000+ posts]

4 sa-8's under seat. full size truck again.

 

[LsGuy]

Oh the 4 8s setup is perfect, and would allow me to make this into 2 boxes instead of 1. That isn't a requirement, but if I can do it feasibly it would be best for easier box removal when I want to fold the seat down. Appreciate that.

 

[Buck 5,000+ posts]

4 sa-8's under seat. full size truck again.

I did quite a few of these sa-8 underseat boxes. The biggest problem you run into is the port.

1. Small woofers usually need more port area then their larger counterparts per cube. sa-8's need 18-20 in^2 per cube sometimes, if not, you'll get port noise. Where an sa-12, you can do 12 in^2 per cube all day long.

2. Obviously the axel/****** hump makes the port config severely more difficult.

 

[Buck 5,000+ posts]

Oh the 4 8s setup is perfect, and would allow me to make this into 2 boxes instead of 1. That isn't a requirement, but if I can do it feasibly it would be best for easier box removal when I want to fold the seat down. Appreciate that.

Have fun caculating your actual airspace. I suggest you use an excel spreadsheet.

 

[LsGuy]

Have fun caculating your actual airspace. I suggest you use an excel spreadsheet.

Haha I'm using my sister, she has her doctorates in math. I failed 9th grade algebra. Twice.

 

[Buck 5,000+ posts]

Haha I'm using my sister, she has her doctorates in math. I failed 9th grade algebra. Twice.

I'm a geometry monster. You should see my city building games lol.

 

[Buck 5,000+ posts]

You need to calculate cubic feet to the thousandths here. A small mistake here could really screw up your Vb.

 

[LsGuy]

Alright, so using my physical measurements, accounting for 3/4 inch plywood to get internal volume, but NOT account for sub displacement, port size, or bracing, her calculations for internal volume of a single large box comes out to 1.9870515046 cubic feet.

 

[Buck 5,000+ posts]

Alright, so using my physical measurements, accounting for 3/4 inch plywood to get internal volume, but NOT account for sub displacement, port size, or bracing, her calculations for internal volume of a single large box comes out to 1.9870515046 cubic feet.

that's plenty for 2

 

[Buck 5,000+ posts]

you really need to keep a close eye on the port speed as well. little woofers have higher port speeds than you would think sometimes.

 

[LsGuy]

you really need to keep a close eye on the port speed as well. little woofers have higher port speeds than you would think sometimes.

Thats why I'm here, I'm new to this. I'm willing to put in the legwork with the hopes you guys can help out with guidance along the way.

 

[LsGuy]

Hey so I did some calcs on doing 2x boxes instead of 1, and then calculated port size from an online site. How accurate do you think this is?

Never know with these online sites. But it says my box volumes will be roughly .8 cubes, and 1.88x3.76 port at 19.5 inches in length, which is almost the entire box length. Thats to pull 35 hz tuning. Thoughts?

 

[Buck 5,000+ posts]

I may be returning to designing. i'm setting all my stuff up if you're interested. not ready quite yet but it'll be soon

 

[LsGuy]

I may be returning to designing. i'm setting all my stuff up if you're interested. not ready quite yet but it'll be soon

Thats definitely possible depending on cost and how long until you start. Ordered the subs tonight, was going to go with the HippoXLs, but I missed the sale. I caught some 6.5s on sale over at fuaudio.com and ordered 2. Apparently they build them after you order, so not sure when they'll be here.