3 questions about my next box build

[04silverz 10+ year member]

First: at what point is a baffle needed? I keep seeing people that add teh baffle but am not sure if its a weight issue, power issue, box size issue or combo. I am planning on buiding 2.5-3 cubed sealed per se 15.

Second: Related to first question, at what point is internal bracing needed? Same three issues from first question.

Third: I have an ext cab silverado and am planning on taking out the back seat. There is a hump in the middle of the cab in the back that I will account for when building the box. I am going to just go straight up and then across and straight back down the hump. In other words it will not be contoured to the hump. When designing the box and calculating the box size I am assuming I just simply calculate it as if it were a regular rectangle, and then calculate the area of the hump and subtract that from the original number? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

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[mlstrass 5,000+ posts]

baffle is needed to mount the subs. I'm "assuming" you mean double baffle. How many subs, how big is the baffle surface, what is the weight of the sub?

I normally do strap bracing so no panel goes more then 12-14" without bracing. Also depends upon the output of the sub and power being applied to it. Your "hump" design might add enough bracing, since it breaks the box up into smaller sections...

 

[fasfocus00 5,000+ posts]

First: at what point is a baffle needed? I keep seeing people that add teh baffle but am not sure if its a weight issue, power issue, box size issue or combo. I am planning on buiding 2.5-3 cubed sealed per se 15.
Second: Related to first question, at what point is internal bracing needed? Same three issues from first question.

Third: I have an ext cab silverado and am planning on taking out the back seat. There is a hump in the middle of the cab in the back that I will account for when building the box. I am going to just go straight up and then across and straight back down the hump. In other words it will not be contoured to the hump. When designing the box and calculating the box size I am assuming I just simply calculate it as if it were a regular rectangle, and then calculate the area of the hump and subtract that from the original number? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

a baffle is a wall or partition, you can't just have your sub open air and hope is sounds good. a standard box has 6 baffles/partitions/walls an infinite baffle has 1 baffle/partition/wall to separate the back wave from the front wave.

internal bracing is usually only needed if you have a wall or in your terms a baffle that is over 2ft long. some may use it less than 2ft some may use more than 2ft just really depends on the box.

why would you not just build the sides of the hump up to make it level, you're just making the build more complicated than it has to be.

i'm sure someone will chime in with a difference to what I said by either saying no or adding to what I had said but those are your answers in short.

 

[04silverz 10+ year member]

baffle is needed to mount the subs. I'm "assuming" you mean double baffle. How many subs, how big is the baffle surface, what is the weight of the sub?
I normally do strap bracing so no panel goes more then 12-14" without bracing. Also depends upon the output of the sub and power being applied to it. Your "hump" design might add enough bracing, since it breaks the box up into smaller sections...

Sorry I didn't specify, I meant double baffle for the wall where the subs will mount. 2 se 15s, not sure on the weight, maybe 20 lbs each. Not sure on the baffle surface yet as I have not figured out what box design I am going to use yet.

a baffle is a wall or partition, you can't just have your sub open air and hope is sounds good. a standard box has 6 baffles/partitions/walls an infinite baffle has 1 baffle/partition/wall to separate the back wave from the front wave.
internal bracing is usually only needed if you have a wall or in your terms a baffle that is over 2ft long. some may use it less than 2ft some may use more than 2ft just really depends on the box.

why would you not just build the sides of the hump up to make it level, you're just making the build more complicated than it has to be.

i'm sure someone will chime in with a difference to what I said by either saying no or adding to what I had said but those are your answers in short.

Not sure what youre getting at in the first part of your post.

Got ya on the second part.

Why build up the sides and with what? Using more wood? I guess that wouldbe an option as I was just thinking of sticking my 4 channel on top of that hump and leaving a gap for it to have air to cool still. But if I built up teh sides I could stick one amp under each side. Problem is I don't think the 2500d will fit. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif