what frequency?

[accuab 10+ year member]

If a box is designed for a certain frequency, can any sub be put in it? What about the sub determines what frequency I can tune a ported box to? I looked a lot for the answer but just couldn't figure this question out. I'm looking at a sub with a Fs of 26.1 if that matters.

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[Kangaroux 5,000+ posts]

Fs is useless once you put a sub in an enclosure. The Fs is only useful if you were using the sub in a freeair/infinite baffle setup. What are the box specs and what sub are you thinking of putting in?

 

[accuab 10+ year member]

was looking at around 2.25 cubes and a kicker cvr 12.

i've looked at re audio to determine port lengths for different frequencies but can't decide on what frequency is best for that sub and for middle ground bass.

 

[UnderFire 10+ year member]

I've heard a few CVR's, and the ones that sounded best to me were in large boxes, like 2.25 cubes, tuned to around 30-32hz.

 

[accuab 10+ year member]

i was thinkin precisely in that range to allow me to get lows out of it. would an amp with a subsonic filter at 30 hz have any effect on which frequency i should choose

 

[Kangaroux 5,000+ posts]

Can you adjust the subsonic filter? If you tuned to 30-32 you would want the filter somewhere around 25

 

[accuab 10+ year member]

it's set at 30hz. i could turn it off but then would risk damaging the sub. right? so with it on i should tune more around 35?

 

[Moble Enclosurs 10+ year member]

was looking at around 2.25 cubes and a kicker cvr 12.
i've looked at re audio to determine port lengths for different frequencies but can't decide on what frequency is best for that sub and for middle ground bass.

This is one of the last times I am going to do this.but here you go...for optimal specs. This can obviously be changed to your liking but provides a basis. Recommended tuning is 35.57Hz. Recommended box volume is 2.19 cubic ft. Recommended port area is 334.19 square cm. And recommended port length is 37.53inches. Will give you something like this:



This is at 2.83V for efficiency

Hope that helps a little. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[accuab 10+ year member]

Thank you for your help. But are those recommendations for that particular sub or just for a middle ground bass sound. I'm really trying to learn as much as possible instead of just getting the answer from someone else. I just got hung up there and my search didn't really get me anything on it.

 

[FlexnInLa 10+ year member]

This is one of the last times I am going to do this.but here you go...for optimal specs. This can obviously be changed to your liking but provides a basis. Recommended tuning is 35.57Hz. Recommended box volume is 2.19 cubic ft. Recommended port area is 334.19 square cm. And recommended port length is 37.53inches. Will give you something like this:


This is at 2.83V for efficiency

Hope that helps a little. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

^^ I'd listen to this guy.

 

[Moble Enclosurs 10+ year member]

Thank you for your help. But are those recommendations for that particular sub or just for a middle ground bass sound. I'm really trying to learn as much as possible instead of just getting the answer from someone else. I just got hung up there and my search didn't really get me anything on it.

No problem. Those are for that particular driver..no other. Just that one. There is no middle ground that I calculate for, but if you want to say middle ground, then the guy that mentioned 2.25cubic ft at 30-32Hz is great for a 12. Recommended box volume is usually 2-3.5X the cubic dimensions of the driver as a very very basic middle ground, with the port tuned accordingly. For example, a 12 inch driver with a depth of 6" will yield a minimum box volume of 1 cubic ft-1.75 cubic ft.then add the port. Smaller compression areas usually yield better (averaged) SQ. But no one usually goes by that. Everyone goes with the correct option of trying to design on a driver by driver basis.

As far as learning as much as possible........well..........it has taken me over 10 years to get where I am now, effectively about 6. And most of it was based on trial and error and logging what happens when I make certain changes to a design and checking for scientific consistency of at least 3 proper responses for each change. And the rest is military and college training. SO, learning will be an adventure depending on how much you want to learn. With that said, I am excited for you! And as a recommendation for starters, any audio books, like the cookbook and such are great ways to get started in understanding certain acoustical changes that we all deal with in designing. I hope that helps.

 

[accuab 10+ year member]

So your recommendations come from your experience? I'm not wanting a complete understanding but want enough to be able to build a simple ported box for a sub without having to ask someone. Like if one of my friends got a sub I could help him get better sound out of a sub and cheaper than prefab. Is there any way to know what will be good for a particular sub without experience with that specific sub? And I really do appreciate your help.

 

[dontbeaprix 10+ year member]

So your recommendations come from your experience? I'm not wanting a complete understanding but want enough to be able to build a simple ported box for a sub without having to ask someone. Like if one of my friends got a sub I could help him get better sound out of a sub and cheaper than prefab. Is there any way to know what will be good for a particular sub without experience with that specific sub? And I really do appreciate your help.

every sub is different and therefore needs a different enclosre , there is no general size that works well with all of them in one size. Quit being cheap and pay a professional to at least design the box for your particular needs and then build it yourself if you have the skills and tools neccesary.

 

[-01limited- 10+ year member]

Box design programs will be your friend for a basic understanding. Try one out and just mess around with it.

 

[accuab 10+ year member]

every sub is different and therefore needs a different enclosre , there is no general size that works well with all of them in one size. Quit being cheap and pay a professional to at least design the box for your particular needs and then build it yourself if you have the skills and tools neccesary.

I'm not being cheap. I'm trying to learn. You are the kind of person that turns people trying to learn away from forums. If you had read my earlier posts, you'd see I don't want someone to just tell me the answer. I want to understand the answer.

And to 01limited I've been playing with a few of them already and understand the box designing just not how to design it around a particular sub.