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View Full Version : My Box plan for 2 RL-P 15's



matt_martin87
12-13-2006, 04:45 PM
http://i9.photobucket.com/albums/a63/mathyouakandn/215rlpplan.jpg

Would anyone like to critique it? I know the tuning and net volume aren't perfect but is this plan good within reason?

crazy4ozs
12-13-2006, 04:47 PM
looks okay to me :)

Flipx99
12-13-2006, 04:49 PM
Can you fit any taller in those Grand AMs? I was thinking about buying one.

That will end up 16.5" tall correct?

matt_martin87
12-13-2006, 04:51 PM
Yes. The box is 16.5" tall.

This is actually for a friend. Grand am trunks are a biotch. The box I have now is 13.5 tall, 23 wide, and 26 deep and that's about as big of box that will fit.

Overall height inside is right around 15.5" on my grand am

Chevyaudio
12-13-2006, 04:55 PM
Maybe im missing something...but im getting 5.8 cubes tuned to 26hz

I cant really see the dimins though

edit-edit-edit-edit

make that 5.6 cubes at 26.2Hz

saywhat?
12-13-2006, 04:56 PM
im thinkign that internal volume is VERY small for those subs. they should see 6+ together.

Flipx99
12-13-2006, 04:56 PM
Yes. The box is 16.5" tall.

This is actually for a friend. Grand am trunks are a biotch. The box I have now is 13.5 tall, 23 wide, and 26 deep and that's about as big of box that will fit.

Overall height inside is right around 15.5" on my grand am


Good to know, thanks for the info

Chevyaudio
12-13-2006, 04:58 PM
im thinkign that internal volume is VERY small for those subs. they should see 6+ together.

Grant, double check me...but im getting 5.6 @ 26

Flipx99
12-13-2006, 05:01 PM
Soundsplinter reccomends 2.5-3.5...I say make the port a bit shorter...Increase the tuning a bit and gives the subs more room....

I don't really see the purpose on tuning that low

matt_martin87
12-13-2006, 05:02 PM
heres a 2 dimensional version

http://i9.photobucket.com/albums/a63/mathyouakandn/better2dboxplan.jpg

Flipx99
12-13-2006, 05:03 PM
I have never seen someone build a box where the left side and right side had different dimensions. Not that that is wrong, just different

matt_martin87
12-13-2006, 05:09 PM
I was only going off of soundsplinter's website on tuning, net volume, and port area.

How would 30hz do for tuning if 28hz is too low?

bdawson72
12-13-2006, 05:09 PM
nice

saywhat?
12-13-2006, 05:13 PM
Grant, double check me...but im getting 5.6 @ 26

honestly dont feel like opening up Excel right now LOL.

off to work on the box.

rpfuror
12-13-2006, 07:25 PM
I get 5.04 cu/ft wo driver displacment @ 26.30 Hz.

With the same externel parameters try this:
Desired Net Volume: 5.42
Desired Box Width: 46.5
Desired BoxHeight: 15
Desired Tuning Freq: 32
SQ Vent Width: 4
Wood Thickness: 0.75
Width= 46.50 inches
Height= 15.00 inches
Depth= 19.00 inches
Port Length= 20.16 inches
Port Area= 54.00 sq/in

This is more like net of 5 cu/ft @ 32 Hz

matt_martin87
12-13-2006, 11:30 PM
what am i missing? here is my math:

net volume: 40.25 x 12.75 x 15 / 1728 = ~4.45cuft for first part
4.75 x 24.25 x 15 / 1728 = ~1 cuft for 2nd part
Together = 5.45 cuft
subtract sub displacments - .42cuft
net volume = 5.03cuft

Port length according to my program is 34.8 inches so I rounded up to 35 inches, which is the length of my port in the design.

If I'm wrong on something, please let me know so I can do it right next time.

mlstrass
12-14-2006, 12:49 PM
I'm running 2 of the 15's each in 2.5^3 @30Hz. I went with 70^2 of port. Sounds VERY good. Plenty of SQ and they will get loud when pushed. Couldn't fit a single
5^3 box in the trunk. Also boxes are only 16" high, but the subs mounted fine.

RL-P's don't require as big of a box as most other subs. Also the lower tuning gives you the flatest response for SQ, but if you want more SPL maybe tune a little higher. You'll be very happy with them, NICE subs!!!

rpfuror
12-14-2006, 08:19 PM
I calculated with 15" as being externel. so yes you math is right.

The tuning is closer to within 1 Hz, so I take back what I stated earlier:)

Here the numbers i'm working with :
Desired Net Volume: 5.45 cu/ft
Desired Box Width: 46.5 inches
Desired BoxHeight: 16.5 inches
Desired Tuning Freq: 27 Hz
SQ Vent Width: 4 inches
Wood Thickness: 0.75 inches
Width= 46.50 inches
Height= 16.50 inches
Depth= 19.00 inches
Port Length= 34.30 inches
Driver Volume= 5.42 cu/ft
Port Area= 60.00 sq/in

Tuning any higher is going to increase your box size.

matt_martin87
12-15-2006, 12:36 AM
Good to hear. I was doubting myself for a second there.