View Full Version : What is the formula for cubic feet?

dec322

06-26-2006, 05:52 PM

Its been a while since I've was in geometry so humor me. I'm thinking about buying a Type R or 13kv.2 and will build a sealed enclosure. How do I figure the cubic feet of an enclosure.

Sidenote question: I heard the Type R sounds horrible in a sealed enclosure. Is this true?

ngsm13

06-26-2006, 05:58 PM

(Width * Height * Depth)/1728= Volume

TypeR's excel in ported boxes.

nG

noob with an RS

06-26-2006, 06:06 PM

12 inches cubed equals 1728. therefore, one square foot is 1728 inches.. divide your dimensions product by 1728 for the cubic foot measurement.

example: 15" x 17" x 77"

15 times 17 times 77 equals 19635

divide 19635 by 1728 to get 11.362

therefore the dimesions 15x17x77 equal 11.3 cubic feet.

tommyk90

06-26-2006, 06:51 PM

Just make sure you are using the INTERNAL dimensions. :)

So take your external dimensions and subtract 1.5" from each of them (if you are using 3/4" MDF, single layered on all sides)

PowerNaudio

06-26-2006, 06:55 PM

Its been a while since I've was in geometry so humor me. I'm thinking about buying a Type R or 13kv.2 and will build a sealed enclosure. How do I figure the cubic feet of an enclosure.

go here (http://www.mtxaudio.com/caraudio/education/enclosureConstruction.cfm) for all the diffrent types of enclosure shape calculations.

Sidenote question: I heard the Type R sounds horrible in a sealed enclosure. Is this true?

no

type R sound very good in a sealed enclosure they are just louder in ported enclousures.

DFW40

06-26-2006, 07:26 PM

screw math....go here

http://www.the12volt.com/caraudio/boxcalcs.asp

woc47

06-28-2006, 01:53 AM

amen, they make it idiot proof for basic boxes, and i've heard type r's in ported and the slap. Also is it true that the older type r's were having trouble with cones disconnecting from the voice coils, thats why alpine changed the surround design