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Re: finding the volume

Posted by footstony (A) on April 19, 2007 at 18:37:12

In Reply to: Re: finding the volume posted by ned209 on April 19, 2007 at 10:31:17:

Hi ned+hollowboy,

I'm glad you're in litres. Cubic feet sounds like it would be hard to walk.
Quoting my previous email
"for the SN-8MB the ported box calculator gives a volume of 0.385 cubic feet for 86.98Hz -3dB frequency."
you measured "25lt without the speakers or the tweeters"
Using google 0.385 (cubic feet) = 10.9019859 litres
for 2 speakers divide by 2 and remove a few litres for drivers and it's almost spot-on for 2 X SN-8MB!
use the calculator on the caraudio site to calculate the port. I like to tune a port by ear, just stick in different length ports and try! I like to have the ports sticking out of the box for this test so they are easier to change. as a guess a cling wrap tube or toilet roll size could be about right. I have seen people use plumbing fittings to coil a long port inside a box.

I love the pic. Those big ports would probably work OK

I think I need to get myself an old boom box shell, install my own electronics and use an ipod to drive it. Do other people do this? are there web sites?

Regards Philip

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