From: bjfish11 - enclosure material question

[FJF 0]

Hey, don't be so defensive let's just discuss this.

Sorry to come across that way. It wasn't my intent. It's just that I read dozens of your posts here.

You asked for other ideas, so you are getting them.

Fair enough.

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.

What about the 15mm Trupan that BJ will use for the project?

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.

Please see above.

I don't mean to sound rude, but have you actually read the whole thread?

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.

The size of the enclosure, given the space in the trunk and my idea of aesthetics.

You use the word "paramount" but then add another driver that is equal to the weight of the enclosure.

True. The sub will weigh ~25lbs, hopefully less.

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.

<sigh> Must be nice to be a forum "expert." The internal volume of the box will be ~/6ft^3, as I said in a post located inches above yours. How you arrived at .9ft^3 is a mystery. As BJ will use 15mm Trupan - why do I feel like I'm repeating myself - what is your estimation of the weight?

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.

The internal volume is per ID's specs. Having built and listened to other ID subs in similarly advised boxes, I'm not doubting the choice.

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.

Sorry, is this enclosure for your car? If you don't mind, please allow me to use my own judgment referenced by ~10 years of competitive seat time and ~20 years auo-x'ing. I wasn't born yesterday.

PS. unfortunately, as I exceeded the limit of quoted text, I was unable to respond to your comments in full, If you feel that all the basis weren't covered, please let me know.