Dimensions for sealed 18" sub box - Page 6

I hope to get the dual opposed models next week. After Mother's day I'll start drawing up some ported boxes. I hope someone can give recommendations for sizes, tuning, and drivers by then.


Still debating how to do the outer cut outs for so many different driver sizes. Many of them are almost the same diameters, so they can be averaged pretty good. Maybe I can get some blank baffles for the odd sizes and if someone needs help cutting the hole, I could do that in my spare time.....assuming they didn't mind waiting a few extra days.

I think you can get away with saying things like that, but only on the AVS forum. Of course I'm just getting the boxes, you're the one with the beast drivers.


I know this is going to sound crazy, but I'm half tempted to make one model that's way over the top for the monster 18's or 21's. Not many people would buy them due to weight, but they would be available for those that were a bit insane. It's going to be a secret until I can get a prototype made up......if it can be done the way I'm picturing it in my head. I won't have time to draw it out until after Mother's Day though.

Because some people are crazy with internal volumes.

Just kidding (sort of). The 3.5 model is taller versus a square cube. So it looks a little different and would be better for a ported design where the port might need an elbow.

Some models will be tweaked and/or possibly eliminated while others are added. We'll just have to see how this all works out.

I was hoping to get 1 cu ft up to 6 cu ft with about .5 increments. The .5's could be made taller versus square. It was just a thought though.

24" cube probably wouldn't work too well. The CNC machines use a 1/2" bit, so unless they got 5'x10' sheets and cut them in half, it would be tough. And 5' wide sheets would give a lot of waste. The boxes could possibly be 23" wide, but taller to get the extra volume.

And keep in mind, those would be some seriously heavy boxes to ship. Certainly 2 packages for each.


Also, I wouldn't wait for the "insane" box. It might not even get done, it was just a thought I had.

You'd have to give me the sizes and shapes so I could find out. I don't know if dual 18's means 6 cu ft or 12 cu ft.

Right now I was just making the typical boxes because no one has really given other ideas to look into.

Dimensions and what drivers would really help me out.

Pictures should be going up today or tomorrow morning now that I'm caught up at work.

I'm going to contact PE to see about getting any discounts on their drivers/amps that may help lower shipping rates. Luckily I live within driving distance and could pick up stuff to make kits.......before the big subwoofer prototypes are delivered for testing.

Still a little worried about shipping the larger flat packs though. I'm suppose to get some "sample" double thick boxes this week, but that won't keep me from starting to ship these out. I've got some pallet corner protectors that can be used to protect all the edges on the flat packs, so that should be good enough to get things rolling. It's not easy finding the correct sized boxes and I'll probably have to cut each box down to the right size.

Any brilliant ideas for matching cutouts with certain drivers? The kits will match up perfectly but what about the other ones that I don't actually have to test fit?

I really don't want to buy an 18" LMS just to test fit the diameter of the cutout. Should I just get holes cut 1/4" bigger than the manufacturer specs? That would be 1/8" clearance all around.

And what about recessing them? They all have slightly different depths.