Recommended volume for subs
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Recommended volume for subs
I have 2 Rockford Fosgate P210S4's.
http://www.rockfordfosgate.com/produ...h%20Subwoofers
They recommend 0.65 cu. ft. in a sealed enclosure. I have been looking on ebay (budget minded) for a sub enclosure. I have found a nice one that has an volume of 0.8 cu. ft.
Would the difference between a recommended 0.65 cu.ft. and an actual 0.80 cu.ft. make much of a difference? I'm not into SPL show stuff, I just want something that sounds good.
http://www.rockfordfosgate.com/produ...h%20Subwoofers
They recommend 0.65 cu. ft. in a sealed enclosure. I have been looking on ebay (budget minded) for a sub enclosure. I have found a nice one that has an volume of 0.8 cu. ft.
Would the difference between a recommended 0.65 cu.ft. and an actual 0.80 cu.ft. make much of a difference? I'm not into SPL show stuff, I just want something that sounds good.
Le Mans Master
Joined: Nov 2004
Posts: 8,718
Likes: 20
From: Dyer IN
Cruise-In IX Veteran
You would get a little bit more low end out of your subs in a larger box, but you loose power handling. What I would do is figure out how much .15 cubic inches is in like 2X4 and bolt some wood down into there to take up the space it works jsut fine this way I have done it more then once
Race Director
Joined: May 2003
Posts: 14,137
Likes: 2,984
From: Iowa
St. Jude Donor '03 thru '26
since I doubt that the .65ft3 takes into consideration the displacement of the speaker, .8ft3 is perfect for you. 
Go for it 
Be sure that the enclosure you are getting cheap is made with a thickness of 3/4 mdf or greater
Go for it Be sure that the enclosure you are getting cheap is made with a thickness of 3/4 mdf or greater
Thread Starter
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
Yeah, I figured a 20 % driver displacement so 0.78 cu. ft. would probably be the best route. Um, it's made of 3/4 " MDF but I punched in the numbers from their dimensions and I get larger than the 0.8 they report.
If it's 31"L x 13.5"D x 13.5"H using 3/4" MDF, I calculated the volume to be like 1.2 cu.ft. But yet they're selling it as 0.8 cu.ft.
So, if it is actually 1.2 cu.ft. would it make a difference to a normal person opposed to an audiophile? I just bought the subs to give it a little bass, nothing crazy like hatch rattling bass.
The amp I got is a Sony XM-D500X. http://carsound.com/articles/publish/printer_299.shtml
If it's 31"L x 13.5"D x 13.5"H using 3/4" MDF, I calculated the volume to be like 1.2 cu.ft. But yet they're selling it as 0.8 cu.ft.
So, if it is actually 1.2 cu.ft. would it make a difference to a normal person opposed to an audiophile? I just bought the subs to give it a little bass, nothing crazy like hatch rattling bass.
The amp I got is a Sony XM-D500X. http://carsound.com/articles/publish/printer_299.shtml
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Even taking into consideration the loss of volume due to the thickness of the MDF, I came up much larger...
If the dimentions you gave are correct, I am coming up with a box about 2.5 ft3! That's HUGE!
That box is enormous.
My math:
31 x 13.5 x 13.5
deduct 1.5" from all dimentions for internal size. That gives us:
29.5 x 12 x 12 = 4243 in3
Next we devide by one cubic foot, 1728 in3:
4248/1728 = 2.46 ft3.
That's a big assed box. Is it designed to hold 2 subs? So each side is half that size?
Rockford is pretty good about giving speaker box sizes, and usually take speaker displacement into consideration.
If the dimentions you gave are correct, I am coming up with a box about 2.5 ft3! That's HUGE!
That box is enormous.
My math:
31 x 13.5 x 13.5
deduct 1.5" from all dimentions for internal size. That gives us:
29.5 x 12 x 12 = 4243 in3
Next we devide by one cubic foot, 1728 in3:
4248/1728 = 2.46 ft3.
That's a big assed box. Is it designed to hold 2 subs? So each side is half that size?
Rockford is pretty good about giving speaker box sizes, and usually take speaker displacement into consideration.
Last edited by bogus; Aug 27, 2005 at 03:11 PM.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
that makes sense.
Still too big.
I just read the owners manual... and the box is .65ft3 WITH the sub.
Read Page 4
Just buy a sheet of MDF and DIY... it's not that hard... and it's quite fun!
Still too big.
I just read the owners manual... and the box is .65ft3 WITH the sub.
Read Page 4
Just buy a sheet of MDF and DIY... it's not that hard... and it's quite fun!
Race Director
Joined: May 2003
Posts: 14,137
Likes: 2,984
From: Iowa
St. Jude Donor '03 thru '26
I came up with .716 cubes off page 4 which would mean to me the displacement of the woofer is .06. On page 8 it states the displacement is .04. Either way, the box you speak of is too large. A speaker box is easy to build but if you do not have the tools, you can still find a different box or put additional bracing or solid fill in the box to take up air space.
Good luck
Good luck
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