decrease sub box volume?

I am in the process of building my sub box and due to the size I am filling the interior volume is too big. I have about 1.8 cu ft per sub and the sub wants 1-1.2 What is the best/easiest way to decrease the interior volume? I've heard 2x4's and 4x4's I'm curious if there are any other ways? This will be a fiberglass front box.

Thanks in advance

Sure, you can glue down pieces of wood.  If you do that I recommend cutting them to length and using them to increase the enclosure bracing.  Another easy trick is to use a piece of MDF over the corners creating sealed triangular spaces.  Whatever you do, just make sure your drivers still fit properly and remember for a sealed system you can be as much as 25% larger than ideal size and the effect on performance is not all that significant,  Smaller will hurt a lot more than larger can.

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DYohn] wrote:

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Sure, you can glue down pieces of wood.  If you do that I recommend cutting them to length and using them to increase the enclosure bracing.  Another easy trick is to use a piece of MDF over the corners creating sealed triangular spaces.  Whatever you do, just make sure your drivers still fit properly and remember for a sealed system you can be as much as 25% larger than ideal size and the effect on performance is not all that significant,  Smaller will hurt a lot more than larger can.

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What affect will larger than 25% have? Currently I'm way over I think 1.0 is recommended I am shooting for 1.2. The subs are Arc Audio Black 12's.

Will this work? https://www.lowes.com/pd_41336-10477-1X24X48+R-TECH_0__?productid=3033248&Ntt=polystyrene&Ns=p_product_price|0

2 x 4s and 4 x 4s are heavy. I would build a box using 1/2 inch mdf and secure it inside the box. A box 8 x 8 x 8 is exactly .3 cubic feet. Build 2 of these per woofer. It would take 2 8 foot 2x4s to take up the .6 cubic feet.

i am an idiot wrote:

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2 x 4s and 4 x 4s are heavy. I would build a box using 1/2 inch mdf and secure it inside the box. A box 8 x 8 x 8 is exactly .3 cubic feet. Build 2 of these per woofer. It would take 2 8 foot 2x4s to take up the .6 cubic feet.

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Box is already mostly built with 3/4" MDF and it's heavy already.

Build 2 boxes. 8 inches by 8 inches by 8 inches. Use 1/2 inch MDF. Place the 2 boxes into the enclosure you already have. These 2 boxes will displace the 6/10 of a cubic foot that you are trying to eliminate.

This won't work due to the subs having to be tilted so they point up a little bit.

tegguy wrote:

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This won't work due to the subs having to be tilted so they point up a little bit.

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What won't work?

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Sorry this won't work

[QUOTE] Build 2 boxes. 8 inches by 8 inches by 8 inches. Use 1/2 inch MDF. Place the 2 boxes into the enclosure you already have. These 2 boxes will displace the 6/10 of a cubic foot that you are trying to eliminate.[/QUOTE]

Edit: Nevermind I read this wrong. It would work but I don't have the space for two 8x8x8 boxes.

The point is if you need to consume space inside your enclosure, building small boxes out of 1/2" MDF is a lot lighter and more efficient than filling it with pieces of 4X4 stock.  Figure out how large you need that you CAN make fit and go for it.

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Since my box is oddly shaped I have decided to finish it and then check the volume after I fiberglass it and go from there.

why does the box have to be so big in the first place? i understand you are building it to fit somewhere but why not build the box to the right airspace and then just make the front the size you need to fill in the space, somewhat like a beauty plate but one that is part of the box.

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The only way this would work was if I didn't make it as deep as I did and then if I decreased that to match the volume I might not have been able to fit the subs because of how they are angled. The box is built as it is and I'm just going to work around it.