Ive seen a few people recommend 1.5-2cu for a sealed Havoc 12. The recommended on the AA site says .6-1.2, and to get QTC of 7 would be .45.

Why are larger sizes recomended?

I have a .75cu box that Ive been using with an RE SR already, and wondering if I should use it, or get a different one. After displacement that would be under .6, less then AA recomended. Or do they recomend the size factoring in displacement already?

When figuring QTC and F3, do you factor in sub displacement first?

Not going to have much power, 400-600w at most.

Edited February 20, 201213 yr by ctmaudi

Larger sizes are recommended more bottom end performance. They handle less power but get lower. If you were only running half the rms of the sub, I would run a larger box to compensate for lack of power.

Larger sizes are recommended more bottom end performance. They handle less power but get lower. If you were only running half the rms of the sub, I would run a larger box to compensate for lack of power.

Thanks, I thought that only applied to ported boxes.

What would be the "ideal" size for an all around daily sealed box for it? Mostly 90s-2000s alternative and rock/pop, and some techno.

Do you ever plan on adding more power? The recommended enclosure volume range is optimal when running rms. If you don't plan to ever increase power and want to stick with 1/3-1/2 rms, I think bigger is definitely better, perhaps even a bit larger than the max recommended 1.2 cubes. I could be wrong here though in suggesting an enclosure larger than recommended by the manufacturer. I would wait and ask Nick what he thinks about the situation before making any final decisions.

I would go for the largest recommended or a little bit bigger as previously suggested if you plan on using that power.

Do you ever plan on adding more power? The recommended enclosure volume range is optimal when running rms. If you don't plan to ever increase power and want to stick with 1/3-1/2 rms, I think bigger is definitely better, perhaps even a bit larger than the max recommended 1.2 cubes. I could be wrong here though in suggesting an enclosure larger than recommended by the manufacturer. I would wait and ask Nick what he thinks about the situation before making any final decisions.

After the three year warranty is up on my car, I will. Untill then, I dont want to stress the electrical too much, or do anything to mess with it. Just running a single four channel, 200w for comps, 400w bridged for sub. If I run a mono amp to the sub, Id probably only push about 600w.

Once the warranty is up Ill get the alt re-spooled and change the battery, etc... and run rated. But thats a while away.

I have a 2.25cu 31Hz box that I built for it for my last car. It sounded great, but is just too big, and I want something small and light weight thats easy to take out if I need extra room for something. Thats why Im just going to go with sealed. Plus Sonic has decent prefab sealed boxes for cheap. To build a smaller ported box would be about $85-100, and take up more room.

Was looking at these, which ever size would do best would be fine. All are pretty cheap, and dimensions should be fine. An slanted back would have been nice, but I want the sub firing up since its a wagon, and so I dont have to worry about anything hitting it.

1.48cu

1cu

1cu with polyfill

1.21cu

1.13cu

The 1.21cu one's dimensions would fit the best. But I could make any of them work fine.

My only expierance with a sealed sub so far is an RE SR in the .75cu box with 250w. Mid bass was nice, and I liked the responce over all the ported setups Ive had, but the output was barely noticeable most the time. That was also in a trunk with the seats up. Would the Havoc in one of those with 400w or so going to at least have decent output? I dont really need the huge output Ive had before, just something that you can tell its there.

Edited February 20, 201213 yr by ctmaudi

Why not just have a nice custom sealed enclosure built? It wouldn't cost much more and you get exactly what you want.

Why not just have a nice custom sealed enclosure built? It wouldn't cost much more and you get exactly what you want.

Shipping kills the price of having someone build it custom, and its not worth the hassle to build it myself when the only thing that matters with a sealed box is the size.

Surely there is someone local to you who can build a proper enclosure.

Surely there is someone local to you who can build a proper enclosure.

Not that Ive ever found, except for people over priced, or have to wait months for them to do it.

If the only thing that matters with a sealed box is size, what is the difference in a prefab or custom? Aside from dimensions, which any of the prefabs I listed would be fine.

Just looked at prices, for MDF, screws, glue, spray glue, and carpet, its $80 for all the stuff needed to make a box.