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Old 3rd August 2011, 13:12   #1
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Default Type of Box for Alpine Type R Woofer

Hey guys, I have an Alpine SWR-1243d sub which I am using along with an M500 mono amp.

It was installed in a tube. I liked the overall loudness of the bass, but it lacked punch, and the bass sounded very similar for all types of songs. I guess tubes are like that.

I changed it to a sealed box. 1.25 cu.ft I think. And the bass is so much tighter, and it sounds much better. But now its still lacking punch. I also think it plays too low sometimes, I don't need the sub to go that low. There is a lot of excursion but there doesn't seem to be so much bass.

The feeling I want is that I should feel like I'm getting hit in the chest whenever its playing loud. I hope you guys understand what I mean. But yet I don't want bass tube kind of bass, I want tight and punchy bass.

Any suggestions? There is work going on in my house, so carpenters are here and I can get a custom box made without any issues. So if you guys can help me with what specs to use, what materials etc etc that will be great.
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Old 3rd August 2011, 14:42   #2
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Default Re: Type of Box for Alpine Type R Woofer

Use it in 1 - 1.1 cuft Box (gross volume) and it will pack more punch and will decrease the low end. Also enable subsonic filter on the MONO amp (if it has one).

Read this:
How to Build a Subwoofer Box
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Old 3rd August 2011, 18:34   #3
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Default Re: Type of Box for Alpine Type R Woofer

Its already going quite low. I don't need it to go lower, infact I its fine if it doesn't go this low. I just want more punch.
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Old 4th August 2011, 03:00   #4
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Default Re: Type of Box for Alpine Type R Woofer

Without changing anything add solid stuff inside the box to reduce the internal volume and suit to your listening tastes. The best thing comes to mind is High Density Thermacol.
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Old 4th August 2011, 09:32   #5
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Default Re: Type of Box for Alpine Type R Woofer

High Density Polystyrene (thermocol) is still transparent to sound. Better would be wood pieces, or even better - bricks.
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Old 4th August 2011, 10:27   #6
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Default Re: Type of Box for Alpine Type R Woofer

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Originally Posted by DerAlte View Post
High Density Polystyrene (thermocol) is still transparent to sound. Better would be wood pieces, or even better - bricks.
WHy not add some bracing. You loose volume and you stiffen the box.
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Old 4th August 2011, 11:09   #7
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Default Re: Type of Box for Alpine Type R Woofer

Im not really keen on opening the box. But do you have any suggestions on another box? Should I just stick to the Alpine specified size? Also will a normal rectangular ported box be better than a bass tube?

Thanks alot guys.
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Old 9th August 2011, 10:12   #8
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Default Re: Type of Box for Alpine Type R Woofer

Guys I think ill get a box made to the Alpine specified specs, but it looks greek to me, can you help me out with that?

External dimensions - 13.5x13.5x24 (I'm assuming the length is 24 and breadth and height are 13.5?)
Gross internal volume - 1.9 cu.ft
Vent area - 15 sq.in (12" x 1.25")
Vent length - 22"
Vent displacement - .29 cu.ft
Net internal volume - 1.5 cu.ft
Something ripple (?) - 27hz, 3.9db, 33hz

Now if you all can help me with the vent etc, where on the box will the vent be?
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Old 9th August 2011, 11:03   #9
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Default Re: Type of Box for Alpine Type R Woofer

Quote:
Originally Posted by akshay1234 View Post
Im not really keen on opening the box.
Quote:
Originally Posted by akshay1234 View Post
External dimensions - 13.5x13.5x24 (I'm assuming the length is 24 and breadth and height are 13.5?)
Gross internal volume - 1.9 cu.ft
Vent area - 15 sq.in (12" x 1.25")
Vent length - 22"
Vent displacement - .29 cu.ft
Net internal volume - 1.5 cu.ft
Something ripple (?) - 27hz, 3.9db, 33hz

Now if you all can help me with the vent etc, where on the box will the vent be?
It does not matter which dimension is called width or which is called length. the dimensions are still the same. 24" x 13.5" x 13.5". I assume they are using 19mm MDF. Which will give you a net volume of 22.5x12x12 which means about 1.875 cu. ft. After woofer and port displacement you will get 1.5-1.6 cu. ft (which is also the same as your spec).

22" is a rather long lenght for the vent but if that's what Alpine wants maybe they know something we dont.

Dont worry about vent displacement or ripple. If you are building to spec just build to spec.

Did they give any picture?
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Old 9th August 2011, 11:15   #10
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Default Re: Type of Box for Alpine Type R Woofer

Quote:
Originally Posted by navin View Post
It does not matter which dimension is called width or which is called length. the dimensions are still the same. 24" x 13.5" x 13.5". I assume they are using 19mm MDF. Which will give you a net volume of 22.5x12x12 which means about 1.875 cu. ft. After woofer and port displacement you will get 1.5-1.6 cu. ft (which is also the same as your spec).

22" is a rather long lenght for the vent but if that's what Alpine wants maybe they know something we dont.

Dont worry about vent displacement or ripple. If you are building to spec just build to spec.

Did they give any picture?
They didn't give any picture. So basically the vent is not a round one, but a rectangular one. And since its length is 22" I'm assuming it will have to open on the side?

Thank you sir.

Ok I just made a quick drawing in paint, something like this fine?
Attached Thumbnails
Type of Box for Alpine Type R Woofer-untitled.jpg  

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Old 9th August 2011, 11:18   #11
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Default Re: Type of Box for Alpine Type R Woofer

akshay copy the box design here. Only the height of your box will be 13.5" and the depth will be 13.5". And you box wont be tapered. If you want to taper your box you can do that too. Just make the average depth 13.5" so say 12" at the top and 15" at the bottom.

http://www.team-bhp.com/forum/ask-gu...ox-design.html

Last edited by navin : 9th August 2011 at 11:19.
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Old 9th August 2011, 12:13   #12
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Default Re: Type of Box for Alpine Type R Woofer

If you need more low end extension go for the full size box, but if you need kick like you mentioned above go for the compact size one..

Digital Designs: Box Recommendations
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Old 9th August 2011, 12:23   #13
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Default Re: Type of Box for Alpine Type R Woofer

Quote:
Originally Posted by navin View Post
akshay copy the box design here. Only the height of your box will be 13.5" and the depth will be 13.5". And you box wont be tapered. If you want to taper your box you can do that too. Just make the average depth 13.5" so say 12" at the top and 15" at the bottom.

http://www.team-bhp.com/forum/ask-gu...ox-design.html
Quote:
Originally Posted by low_bass_makker View Post
If you need more low end extension go for the full size box, but if you need kick like you mentioned above go for the compact size one..

Digital Designs: Box Recommendations
So should I just stick to the Alpine specs, or to what LBM has shown me?

LBM I want that kick, but also I want loud bass.
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Old 9th August 2011, 12:58   #14
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Default Re: Type of Box for Alpine Type R Woofer

Go with the compact box design.
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Old 9th August 2011, 16:31   #15
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Default Re: Type of Box for Alpine Type R Woofer

Quote:
Originally Posted by low_bass_makker View Post
Go with the compact box design.
Thank you LBM. Will get the carpenters to start on that, but this total area is smaller than the Alpine box, will I still get a good kick and loud bass out of it? I don't really want to be disappointed after getting it made so just double checking.

Also any insulation or padding on the inside? I'm not sure if these guys know exactly how to build it, will fevicol be fine for gluing the sides, or should they get something else?
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