how to tell what a box is tuned to

[PV Audio 5,000+ posts]

Dude look at his pictures.....just look at them. Don't tell us he needs to keep trying to build specifically tuned subwoofer boxes, he needs to learn woodworking skills on birdhouses or some shit like that.
I see what your saying, but no. The kid needs to start off small before he jumps into this. The best he can hope for is somone to do all the cuts for him, and he can put it together.

Precisely. It's been shown many times that the thread starter does things half assedly, so expecting him to understand what Q means when designing a box is a bit ambitious.

A regular ported box is a small step,granted he should have started with a sealed box.So we give him a box design and he builds it.He still wont know why its good. This thread was about finding tuning not wood working.I dont care what his box looks like because he has no idea what Fb,Vb Or F3 or any of that means yet.He should draw up a box plan on his own,figure out all the measurements on it.Then come on here and get some problems fixed with out all the hassle.

I'm honestly being as nice as I can when I say this, but how the hell is that a good idea? Trial and error is NOT the way to learn how to design enclosures, and believe me when I say this, I am living proof of that. I probably built 30 "speakers" without knowing what I was doing before I learned loudspeaker theory, and the first set there after was like someone lifted a bag from off my head. If you know what to expect, you can build that and compare it to something else; not just guessing what changed from one guess box to the next.

 

[pr-festiva 10+ year member]

He can build the most beutifull box ever and with out knowing any thing about it,it is still worthless.I have been saying he needs to learn the theory first and then design his own box then get our advice on it.Also when building spl boxes there is alot of trail and error,agree or no?

 

[MikeR. 10+ year member]

He can build the most beutifull box ever and with out knowing any thing about it,it is still worthless.I have been saying he needs to learn the theory first and then design his own box then get our advice on it.Also when building spl boxes there is alot of trail and error,agree or no?

Your fighting a battle that simply cannot be won

In your mind do you honestly think he is capable of doing all that you mentioned? Before you answer I want you to really think about it....

Were not stating the box needs to be pretty, infact I dont' think anyone was ripping on the fact that it was ugly more than the fact that there was no possible way that it performed to the most minimal of standards a subwoofer box can be based off of.

 

[PV Audio 5,000+ posts]

He can build the most beutifull box ever and with out knowing any thing about it,it is still worthless.I have been saying he needs to learn the theory first and then design his own box then get our advice on it.Also when building spl boxes there is alot of trail and error,agree or no?

Yes, I agree completely, but this isn't an ordinary situation. Someone who installs two different size drivers of different brands in a single box and runs them with another different sized driver from another different brand and calls it a system most likely won't even want to learn the theory. We are the minority, and I know that you know that. We like to know how things work to make them better. Most, however, just want them to be good already and couldn't care less how it works. He fits into this category. Expecting someone to learn about loudspeaker theory is almost preposterous when they recycle wood from old enclosures and make panels out of odd shaped scraps of different kinds of wood. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Your fighting a battle that simply cannot be won
In your mind do you honestly think he is capable of doing all that you mentioned? Before you answer I want you to really think about it....

Were not stating the box needs to be pretty, infact I dont' think anyone was ripping on the fact that it was ugly more than the fact that there was no possible way that it performed to the most minimal of standards a subwoofer box can be based off of.

Exactly what I was saying, nicely put. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Hydrastas 10+ year member]

alright so i've got a design, the enclosure calc says it'd be at 34.75 hz. would that be alright?

 

[Hydrastas 10+ year member]

and i get 5.64+ .331= 5.971 cu ft for box size after port? with port being 1.127 cu ft, numbers sound about right? and i finally replaced the ole ab dx 15 for a Audiopipe TXX-SPL15. i've been lookin everywhere for a box spec for this sub but no luck so far, not sure if this box design would go well for it or not.

 

[PV Audio 5,000+ posts]

alright so i've got a design, the enclosure calc says it'd be at 34.75 hz. would that be alright?

It kinda depends on how the wood is oriented, as you can throw off dimensions by 1.5".

 

[pr-festiva 10+ year member]

Wow what do ya know,all ready designing his own box with a little help from his friends.My friend mark started the same way as hydrastas,now he is doing much better.And yes i think he is capable of the things that i said,if he wants to be.Not every one starts off with the right tools,computer programs or money.I know when i first started i done a couple half *** jobs in my ride but i learned from those systems,and now i can look back and say "i can't believe i done that".Im guessing most of us were at that point some where.

 

[MikeR. 10+ year member]

Alright he can grasp the rudimentary skills of geometry! Can't wait to see the box!!!!!!!

 

[pr-festiva 10+ year member]

should have seen a couple of my first box's,built one out of a particle board coffee table,tuned one to 19 Hz,those were the times lol.

 

[PV Audio 5,000+ posts]

should have seen a couple of my first box's,built one out of a particle board coffee table,tuned one to 19 Hz,those were the times lol.

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif:laugh://content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif Don't even use that phrase when talking to me.

 

[DBDRAGGUY 10+ year member]

How much to build me a box similiar to your original, but for 2 15's?

 

[BuckyBoy 10+ year member]

How much to build me a box similiar to your original, but for 2 15's?

//content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[Hydrastas 10+ year member]

alright the new box is finally done, spent a couple hours on it tonight.

only took a minute or two with a crowbar to get the old box out lol.

i went to home depot today and got some mdf, and i actually used wood glue this time. ended up going smaller than at first, tuned to 35 hz. havn't had time to test it didn't wanna wake the neighbors.

 

[808_bass 10+ year member]

can we get a round of applause?? that first box must have been a joke..theres no way you thought that was the right way to install..