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.Support the12volt.com

DYohn wrote: 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.

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? http://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: 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.

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

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.Support the12volt.com