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View Full Version : 3 cubes or 3.5 cubes @ 32hz? 15" Alpine Dual4 Type-r



Supergumby5000
12-28-2006, 02:07 AM
Well, what do you all think? ordering the rest of my gear tomorrow hopefully so i want to start building the two boxes before my subs show up and taunt me from the corner of my bedroom.

Putting these in a Ford explorer. I have enough room for up to 3.5 cu ft for each box (type r's will each have their own ported enclosure). The alpine specs say 3 cubes, but i see a lot of people get up to around 4 cubes.

Opinions please!!! 3 cubes @ 32 hz or 3.5 cubes at 32hz? what will the difference be? Thanks!

JoshHd6
12-28-2006, 04:18 AM
well..how much power r u gonna be giving the woofer..

15nissen
12-28-2006, 09:52 AM
4.0 before displacement @ mid 30's.

SHiZNiLTi
12-28-2006, 10:21 AM
I vote 5 cubes at 34hz, only cuz I know it sounds ****** and so far everyone else that has listened to it at the local car show thinks the same.

Click the pic to be brought to the build log if it...
http://img157.imageshack.us/img157/2954/boxzs8yh1.th.jpg (http://www.caraudio.com/forum/showthread.php?t=199866&page=3)

Let me know if you want a cutout sheet? The box is roughly 36.5x26x14.5

Supergumby5000
12-28-2006, 03:23 PM
Wait 5 cubes TOTAL for two 15's? I thought that would be kinda low hehe. are you runnin 12's or 15's? I asked this question thinking 3 cubes each might be a little small :laugh:

My limit of space is 7 cubes, and i want two enclosures (leaving 3.5 cubes for each sub)

Calikid
12-28-2006, 03:24 PM
get a tcab.

Supergumby5000
12-28-2006, 03:24 PM
well..how much power r u gonna be giving the woofer..

Hifonics XX herc, which is 2000wrms @ 1 ohm

Supergumby5000
12-28-2006, 03:25 PM
get a tcab.

I dont know much about Tcab enclosures, maybe i'll research em a bit but i think i just wanna go two ported enclosures right now. Maybe ill switch it up after a month or two.

tommyk90
12-28-2006, 03:27 PM
3.5 cubes per 15" would be fine. Try to get around 35-40 square inches of port area PER sub as well.

Supergumby5000
12-28-2006, 03:46 PM
Net Volume: 3.5 cubic feet
Tuning Frequency: 32 Hz
Port Width: 3.75 inches
Port Area: 61.875 Square Inches
Port Length: 40 inches

External Dimensions: 20 wide x 18 tall x 31.75 deep.

Board Dimensions and Quantity
Color Count Width Height
Top and Bottom 2 20 inches 31.75 inches
Red 1 15.5 inches 16.5 inches
Yellow 1 31 inches 16.5 inches
Black 1 18.5 inches 16.5 inches
Green 1 31.75 inches 16.5 inches
Teal 1 26.5 inches 16.5 inches
Violet 1 6.5 inches 16.5 inches

Number of 49x97 Sheets of 3/4" MDF: 0.75

Supergumby5000
12-28-2006, 03:48 PM
oo cut and paste didnt work too well hehe, well its showing the pieces for the subwooder with width and height. thats the plan that i thougth would work, where the sub will be on the red side of the design. Im kinda leary about the end of the port facing towards the rear of the sub tho. Does that matter? Can i move that purple piece to make a 90 degree angle with the light blue one and keep the same tu ning?

tommyk90
12-28-2006, 03:48 PM
And for an explorer I would to sub up, port back, so you should mount the sub on the yellow board in that diagram, as close to the red board as possible (as far away from the port end as possible)

Supergumby5000
12-28-2006, 03:52 PM
hmm point up? i have a Type-E ive been screwing around with for a while (been fun lol, but i think im gonna sell it off to one of my buddies tomorrow cheap). Its in a sealed enclosure i guess, but it sounded horrible when pointed up. Could barely here it. When the waves bounce off the back door/hatch/whatever it sounds much better.

tommyk90
12-28-2006, 03:53 PM
hmm point up? i have a Type-E ive been screwing around with for a while (been fun lol, but i think im gonna sell it off to one of my buddies tomorrow cheap). Its in a sealed enclosure i guess, but it sounded horrible when pointed up. Could barely here it. When the waves bounce off the back door/hatch/whatever it sounds much better.

A ported box is going to act completely different from a sealed one, especially with the equipment you are going to put in there. :)

Supergumby5000
12-28-2006, 03:55 PM
yeah from your sig sounds like you know yer **** too. hmmm maybe i will do that then. Guess that would be better then the subs facing the door with only about 5 inches of space heh.

SHiZNiLTi
12-28-2006, 04:06 PM
Wait 5 cubes TOTAL for two 15's? I thought that would be kinda low hehe. are you runnin 12's or 15's? I asked this question thinking 3 cubes each might be a little small :laugh:

My limit of space is 7 cubes, and i want two enclosures (leaving 3.5 cubes for each sub)

Sorry, disregard my post. I have no experience with the 15 Type R's only 12's and thought you were trying to do (2) 12's in 3.5 cubes total giving each the factory recomended 1.75 each which is way too low IMO. Anyways good luck with building a box for both your 15 type R's :D