From: bjfish11 - enclosure material question

[///M5 2,833]

Hey, don't be so defensive let's just discuss this. You asked for other ideas, so you are getting them.

So let's look at this weight more closely that you want to keep to a minimum.

MDF, 3lbs/sq ft, sure Trupan may be 80% of the weight.

The box for the pair of 8's will be around .8-.9cuft, so for easy math lets say 1ft (cubed) which is only .67 cuft but with 5 sides the enclosure will weigh 15lbs with MDF and a whopping 10-12lbs with Trupan. Each of your subs is more than the enclosure. If weight were really such a concern, I'd really like to know why using one driver with nearly the same enclosure size and the nearly the same weight wouldn't be actually your goal. You use the word "paramount" but then add another driver that is equal to the weight of the enclosure.

Note I was very conservative on the enclosure weight. 10lbs would mean Trupan is only 2lb/sq ft and I didn't add any weight for the baffle side of the enclosure. Your box will weigh more than that. On top of that I only computed it for a .67 cuft enclosure and not the actual .9 or so that you would need.

One other comment. Your claim your goal is SQ, but yet you are willing to sacrifice the single most important portion of setting up a sub by putting it in a sub-par enclosure from a rigidity standpoint. I realize this is for a compromise, but then saying that you concerns are for the utmost SQ is a bit oxymoronic.

*I will also argue that you won't feel the difference of the weight by saving 20% of the box weight in your car as an under 10lb change isn't much, but that discussion we can have elsewhere as we should first address your concern with the box. Easy to test the weight difference though. Go take a lap and then add 2 gallons of gas and take it again, it will be the equivalent of having the sub box be made from 3/4".