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cabinet volume

 
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krimney
Junior Contributor 10+


Joined: 25 Apr 2003
Posts: 13
Location: Alberta

PostPosted: Thu Jun 04, 2009 7:19 pm    Post subject: cabinet volume Reply with quote

I am toying with the idea of building a speaker cabinet and using kef bass drivers in it. Aesthetics will be as important as the sound but I'd still like it to sound good.
I was thinking of either a B139 or a B300 as the bass driver, likely with a Kef 105 II crossover (less the s-stop circuit).
I may try using all the components of a pair of concertos in the new cab as well.
My bass enclosure would be triangular in shape, and I am thinking sealed with a voulme of approx 6 cubic feet.
Reaching the low frequencies will be more important than high volume...I'll be in an apartment.

Any suggestions??
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ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Thu Jun 04, 2009 9:42 pm    Post subject: Reply with quote

Quote:
approx 6 cubic feet




Presuming you have the Ref 105-2 "heads" to use the time aligned crossover (the standard CS9 box and frequency domain PL301 crossovers using the same drivers are different) for the B300Bs, you nead a sealed box of 65 to 75 litres NOT 179!

You might consider this
http://www.hifiloudspeakers.info/Anatomy/KEFDocuments/KEFGermanGallery/pages/p18.htm
Very Happy.
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krimney
Junior Contributor 10+


Joined: 25 Apr 2003
Posts: 13
Location: Alberta

PostPosted: Thu Jun 04, 2009 10:32 pm    Post subject: No 105 heads Reply with quote

I do not have the 105 heads. I thought that all the crossover components for the 105 were in the lower unit. i thought it was just the s-stop circuit was in hte head and that this had no effect on sound....that it was only a protection circuit.

Looking at my original idea, my dimension might have been too big, a 2 foot wide speaker may be too much, could make the base 1.5x1.5 which would bring the volume down to around 80 or so depending on internal bracing ...

I was thinking about a triangle for the base(about 3' high) with an inverted triangle(about 1' high) above it housing the mid tweet
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SaSi
Senior Contributor 200+


Joined: 24 Aug 2008
Posts: 223

PostPosted: Fri Jun 05, 2009 9:48 pm    Post subject: Reply with quote

If you are considering an inverted pyramid for the tweeter, then think twice. The pointy edges and corners are not a good idea as they will be emitting diffractve waves.

Also, if you are going to use a B139 or a B300 as a bass driver, then you most likely need a midrange of sorts. An 8~5" driver (B200 or B110 in KEF terms).

The original 105 with the B300 was combined with a B110 and many B139 based designs use either the B110 or the B200.
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