12 alpine type r

i need a help on building a custom ported box for my type r. i want it really loud. what would be the right measurements/dimensions. any tips? thanks.

"13" high x 16" wide x 15-1/2 bottom x
12" top the cu.ft.of the enclousure is around 1.25"

that is what you gave me w while back. its different.

Geezus, what amp are you using for highs, your not going to need anything other than a single deep cycle battery with 1 M-500 and 1 other amp if its using the high pass filters. You will need 4ga wire and ANL type fuse. Also, 14x18x20, INTERIOR measurements, minus port and speaker displacement, will yield 2.0ft3. IT WILL sound different than 1.25ft3 ported. Better or worse is up to the listener. Always measure using the inside diameter. Thats what matters. Either way, your under power to port. You could run two M-500 to a single 12" DVC2ohm Alpine sub.

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This is what I do for FUN!

Indeed, definitely not a need. RMS values given from that manufacture prove NADA, nor do they make my statement false.

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This is what I do for FUN!

You can use either a 1.25 or 2.0 cu.ft. ported enclosure with a round 3" x 9.9 port The Alpine Type-r's handle 500 watts rms tjjr8120 is righ on the money.

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I'm the one you want working on your vehicle or your subwoofers

imupabove wrote:

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i need a help on building a custom ported box for my type r. i want it really loud. what would be the right measurements/dimensions. any tips? thanks.

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Do you want only loudness or would you like to maintain some sound quality? A ported enclosure that is 2 cubic foot tuned to around 34Hz would give you good output while maintaining some SQ. If you want something louder then tune it slightly higher with a slight loss in overall SQ.

What dimensions do you have to work with?

how do you exactly "tune" it higher?

imupabove wrote:

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how do you exactly "tune" it higher?

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Well the tuning frequency of a ported enclosure is based on the internal volume (not including any displacements from the sub, port, bracing, etc), the cross sectional area of the port (height and width), and the length of the port. So if you were to change any of those factors you could make the tuning frequency higher or lower. If you were to say increase the port area but keep the same port length the tuning would increase. Also, if you were to keep the port area the same and shorten the length of the port the tuning would increase.

When I say tune it higher for more loudness I mean only a slight bit. If you were to increase the tuning too much you would not have anything worth listening to. I would only recommend tuning up to about 36Hz with the 2 cubic foot internal volume I listed. I would need to model the enclosure up again to figure out what the best enclosure would be for anything more then that.

I know you said you want it to be "loud" but is that all you are looking for? Do you care about the sound quality of the bass at all or do you just want it as loud and "boomy" as you can get? I'm just trying to make sure that we are on the same page so I don't give you a design that you won't like.

"I would need to model the enclosure"

what model?

imupabove wrote:

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"I would need to model the enclosure"

what model?

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Models? @the12V oh man, you guys own, thats just great!

Hey Imup are you sound deadened, did I miss that post?



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This is what I do for FUN!

yes i want really loud. but at the same time good SQ but more SPL.

check out this box:

if you can do me a favor and go on eBay and copy paste this on the search bar: 290337232587 (sorry, link thing isnt working :[) thanks alot.

Do you really not know what modeling an enclosure means?

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Support the12volt.com

maybe maybe not. explain moderator guy.

Modeling = using computer software to simulate the enclosure parameters and predict the performance of a particular system.

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Support the12volt.com

well please can you model is it for me, remember spl more than sq :]. i have a 93 camry.

What kind of software would you use to do that? Will the manufacturers recommendations give you the best sound possible from any sub? reason im asking is cause I have a jl 13w7 but i want it to be as loud as i can get it without giving up to much sq. I want spl but i dont want it to sound like trash either. I know the jl specs but is there anyway i could get more spl by changing the enclosure without sacrificing sq.

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If the trunk dont rattle then its not loud.
If it's to loud then you're to old.

i heard measuring your trunk is the best way for maximum loudness.

Measuring your trunk will let you know how big your box can be. But if room is not an issue would it mean that the bigger the box the louder it is going to be?

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If the trunk dont rattle then its not loud.
If it's to loud then you're to old.

i_want_the_boom wrote:

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What kind of software would you use to do that? Will the manufacturers recommendations give you the best sound possible from any sub? reason im asking is cause I have a jl 13w7 but i want it to be as loud as i can get it without giving up to much sq. I want spl but i dont want it to sound like trash either. I know the jl specs but is there anyway i could get more spl by changing the enclosure without sacrificing sq.

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Software: WinISD or Unibox, both are very good.  The Hot Topics section has a great tutorial on using WinISD.  And no, the MFG recommendations are not always the best sound possible.  They give you a good usable starting point that will work for the typical applications, but they are not necessarily intended to squeeze every last db out of a woofer.

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Support the12volt.com

i_want_the_boom wrote:

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What kind of software would you use to do that? Will the manufacturers recommendations give you the best sound possible from any sub? reason im asking is cause I have a jl 13w7 but i want it to be as loud as i can get it without giving up to much sq. I want spl but i dont want it to sound like trash either. I know the jl specs but is there anyway i could get more spl by changing the enclosure without sacrificing sq.

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DYohn is right (of course) about manufacturer recommendations not always being the best. This is moslty going to happen when you are dealing with large manufacturers such as Alpine or JL.

There is a lot of thought and testing that they put into their recommendations. However, their recommendations have to withstand several factors smaller companies will not face. They need to make sure to appeal to large crowds of people. This means making an enclosure that is small so it can fit in most people's vehicles. It also means having the sub's sound be appealing to their customers. A lot of times this means a highly tuned enclosure that is mostly made for loudness. For serious car audio enthusiasts this is not ideal which is why we typically use different enclosures.

Like DYohn said as well, the manufacturer recommendations are good to start from. I typically start with these to get in the right ballpark. I will use them to compare and contrast different enclosures.

imupabove wrote:

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well please can you model is it for me, remember spl more than sq :]. i have a 93 camry.

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If you want good SPL but also some SQ then use the 2 cubic foot tuned to 34-36Hz I recommended earlier. That is a design that I have had good results with for what you are looking for. I have heard many other people happy with the same specs as well.

eBay links won't work here (read the rules and it says that). I looked at the enclosure and it "looks" okay. 2 cubic foot tuned to 32Hz is what I typically use for a mix of loudness and SQ. If you are looking for a little more loudness then I recommending tuning a little louder so the 34-36Hz range is best. The only possible issue I see with that eBay enclosure is the size of the port. The port area looked a little small. This means you could have port noise with that enclosure. However, I am only judging based on the picture since I did not see dimensions for the port. Other then that the enclosure looks like it is decent. I have not had experience with it so I can only tell you from what I see in the listing.

whiterob wrote:

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eBay links won't work here (read the rules and it says that). I looked at the enclosure and it "looks" okay. 2 cubic foot tuned to 32Hz is what I typically use for a mix of loudness and SQ. If you are looking for a little more loudness then I recommending tuning a little louder so the 34-36Hz range is best. The only possible issue I see with that eBay enclosure is the size of the port. The port area looked a little small. This means you could have port noise with that enclosure. However, I am only judging based on the picture since I did not see dimensions for the port. Other then that the enclosure looks like it is decent. I have not had experience with it so I can only tell you from what I see in the listing.

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okay i have two questions:
1. you said 2.0 cu. ft. tuned @ 34-36hz right? how would i get the measurements for that? i can use that RE Audio calculator right? but not sure how to get it down to what you said (2.0 cu. ft. tuned @ 34-36hz)

2.what if i find out the port measurements for that box on ebay; what should it be? ill send it to you asap.

thanks.

imupabove wrote:

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whiterob wrote:

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eBay links won't work here (read the rules and it says that). I looked at the enclosure and it "looks" okay. 2 cubic foot tuned to 32Hz is what I typically use for a mix of loudness and SQ. If you are looking for a little more loudness then I recommending tuning a little louder so the 34-36Hz range is best. The only possible issue I see with that eBay enclosure is the size of the port. The port area looked a little small. This means you could have port noise with that enclosure. However, I am only judging based on the picture since I did not see dimensions for the port. Other then that the enclosure looks like it is decent. I have not had experience with it so I can only tell you from what I see in the listing.

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okay i have two questions:
1. you said 2.0 cu. ft. tuned @ 34-36hz right? how would i get the measurements for that? i can use that RE Audio calculator right? but not sure how to get it down to what you said (2.0 cu. ft. tuned @ 34-36hz)

2.what if i find out the port measurements for that box on ebay; what should it be? ill send it to you asap.

thanks.

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1) The RE calculator would be the easiest way to design that enclosure. You would just put in some dimensions and you will see all the info on the enclosure.

2) Well if you have around 30 square inches of port total then you would be good. You could probably get away with a little less.

You would just take the width and height of the port and multiply them to find the port area. The height looks like it is 13 inches. So if the width of the port is 2+ inches then it should be okay for not having port noise. A 2 inch wide port would give you 26 square inches or about 13 inches per cubic foot. That should be fine without having port noise or a small amount at least.

whiterob wrote:

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1) The RE calculator would be the easiest way to design that enclosure. You would just put in some dimensions and you will see all the info on the enclosure.

2) Well if you have around 30 square inches of port total then you would be good. You could probably get away with a little less.

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how do i narrow it down to 30 square inches? im not sure what to type in.

imupabove wrote:

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whiterob wrote:

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1) The RE calculator would be the easiest way to design that enclosure. You would just put in some dimensions and you will see all the info on the enclosure.

2) Well if you have around 30 square inches of port total then you would be good. You could probably get away with a little less.

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how do i narrow it down to 30 square inches? im not sure what to type in.

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The #2 I put was in reference to the eBay enclosure you were looking at.

If you wanted to know about how large to make the port then you would take the height and width of the port and multiply them together. If it is around 30 square inches then you would have an acceptable port to not have port noise. If the port area is larger then that is fine but the port length will be longer.

What are the dimensions you have to work with for an enclosure in your trunk? I'll make a design for you on the RE Audio box creator if you let me know what dimensions you need the enclosure to be within (height x width x depth). Make sure to measure the trunk opening so the enclosure will be able to be put into the trunk.

the prefab ported box i have now; the port is about 13 inches long and 2 inch wide. so that 26 square inches right? it sounds okay, but i KNOW its the box that is not giving what i want to hear. i seen on youtube they made a box for a lil sub/speaker and it was pretty loud. they were to "emphasizing" that it's all about the box. they also had 2 8" inches that were very loud! and people sat in it too hear them and most of them thought they were 2 12s, 1 15, even 3 12s! so im pretty sure its the box. i just need someone that knows what theyre doing and build me one :].

btw. i will get the measurements for my trunk tomorrow. thanks alot.

"i just need someone that knows what theyre doing and build me one"
Ya, it would be nice if they had like *somewhere* to go to that specialize in building custom subwoofer boxes for cars.   Got rocks?!!!


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This is what I do for FUN!

here are the dimensions for my trunk:

W: 54"
H 20 1/4"
D: Bottom- 45" Top- 39"

for the width i measured in the middle because i were to go deeper the box would hit the top easily and the speakers. you know what i mean?

imupabove wrote:

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here are the dimensions for my trunk:

W: 54"
H 20 1/4"
D: Bottom- 45" Top- 39"

for the width i measured in the middle because i were to go deeper the box would hit the top easily and the speakers. you know what i mean?

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That is plenty of space for the enclosure. None of those dimensions will be a problem.

Using the RE Audio box calculator I made a design for you. Just simply type in the value listed below and you will have a design that is 2 cubic foot tuned to 36Hz. The internal volume will be a bit high but after sub and bracing displacement it will be about 2 cubic foot. The tuning will also be slightly off at first but when the internal volume changes it will be around 36Hz.

Box Width: 25"
Box Height: 15"
Box Top Depth: 16.5"
Box Bottom Depth: 16.5"
Wood thickness: 0.75"
Square port width: 2.25"
Square port length 2: 5"

Try that design out using the calculator in the link. It should give you all dimensions of the parts needed.
Enclosure calculator

great. thank you. just wondering. how did you get these measurements?

imupabove wrote:

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great. thank you. just wondering. how did you get these measurements?

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They were just some random ones I created. I just changed them around a bit until I got the specs I liked. You can modify the dimensions if you would like.

whiterob wrote:

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They were just some random ones I created. I just changed them around a bit until I got the specs I liked. You can modify the dimensions if you would like.

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what were the specs suppose to be? 2.0 cu. ft. tuned @ 34 hz?

will this box be louder than what i have now?

imupabove wrote:

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what were the specs suppose to be? 2.0 cu. ft. tuned @ 34 hz?

will this box be louder than what i have now?

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It was made to be 2 cubic foot tuned to 36Hz. Like I said before, it is a little larger to account for driver and bracing displacement. If you were to add those two then you would get very close to the 2 cubic foot @ 36Hz.

I don't know if it will be louder then what you have now or not. Do you know the specs of your prefab enclosure?

I would guess that this design would sound better overall but I don't know if it will be louder. Prefab enclosures are typically tuned pretty high (higher then 36Hz) so it may not be quite as loud at some frequencies. I would bet that it would give you better overall sound while still being loud though. Without the prefab specs there is no way for me to say for sure.

here are the specs on the box i have now:

Port tuned @ 38 Hz (that is what is said on the description)
3/4" thick MDF (almost an inch)
(W x H x D): 19.25" x 14.25" x 16.25"

im not happy with my bass. its not loud enough lol. do you recommend any sub or subs?

imupabove wrote:

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here are the specs on the box i have now:

Port tuned @ 38 Hz (that is what is said on the description)
3/4" thick MDF (almost an inch)
(W x H x D): 19.25" x 14.25" x 16.25"

im not happy with my bass. its not loud enough lol. do you recommend any sub or subs?

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If you are using an enclosure tuned that high then you probably won't be getting much louder sound and still have a good daily driver.

If loudness is your goal then look into AudioQue or FI Car Audio. They have some good subs that will get loud and are priced well.

what about 2 kenwood kfc-w3012's in a ported box?