how to design a sub box?
Posted 06 August 2012 - 05:31 PM
starting to think about the sub box for my sub. i have decided on doing a box instead of a fibreglass spare wheel well design. Mainly so i can take it out if i need to.
so here are the details of the sub
33KX Technical Specifications
13″ (33cm) Subwoofer
High power handling
Use in sealed box from 30 to 50 litres (1.059 – 1.766Ft3)
Max. Power: 800 Watts
Nom. Power: 400 Watts
Sensitivity (2.83V/1m): 90dB
Long throw butyl surround
Frequency Response: 30Hz* – 1000Hz
Double voice-coil: 2-9/16″ (65mm)
there is a ton of info in that link. it will be powered by a 500w amp. i am thinking that a 50L box would suit me best unless anyone can suggest other wise. Would i need bracing? i have looked at a heap of box build threads and have a pretty good idea on how to build it. its just the actual size of the darn thing thats stumped me. i am tipping that a sealed design is what i am looking for aswell.
i will post up pics on what size i have to work with tomorrow if that will help anyone.
as a side note is there a online site that i can input details and it will do the maths for me??
thanks in advance
Posted 06 August 2012 - 07:54 PM
As you have noted the awesome team at Focal has a mammoth amount of info in their PDF's just to make this very simple for us noobs :-)
They have denoted the following:
30 liters (1.06 cu. ft.) F - 3 = 42Hz / Fast and tight bass
40 liters (1.41 cu. ft.) F - 3 = 41Hz / Punchy and dynamic bass
50 liters (1.77 cu. ft.) F - 3 = 40Hz / Deep and articulate bass
Once you know what your chasing listening wise you simply build your enclosure using volume calculators (http://www.the12volt...io/boxcalcs.asp)
and something like Google SketchUp to draw it up and get you cut list (http://www.sketchup....wnload/gsu.html)
Here is my current design just to give you an idea of what someone with no experience can do with these simple tools :-)
This is the resulting product:
Edited by Equilibrium1990, 06 August 2012 - 07:55 PM.