Replies to this should probably go off-list now :)
> From: Kris Kirby
>
> On Mon, 17 Jun 2002, David Woyciesjes wrote:
> > Well, my Hamer 5 string bass does quite well through the Peavey
> > head, and into a homemade 4 x 12" speaker cabinet. Yeah they're some old
> > generic 12" woofers, but they do 'boom' well, for now... :)
>
> How have you got the cab wired? Each side in paralell then in series with
> the one next to it?
>
> This might be a much cheaper alternative for me. But I'm wondering if I
> could cram a 15" into there somewhere. (15" + 4x 12"?) maybe an 8" as well
> in addition to some form of dome or horn tweeter...
>
> --
>
Let's see, each woofer is 8 ohms, so I have each side wired in
parallel to their own 1/4" socket on the back, so they'll show 4 ohms. My
head has two speaker jacks, so I can have it see 2 8 ohm speakers, or wire
in a homemade adapter so it will see a 2 ohm load. I've been thinking about
wiring in some DPDT switches, so I can flip each side between 2 & 4 ohms.
Depending on how much you travel with those speakers, here's how I
would set up the boxes...
- 15" in a ported box, all by itself. It'll be heavy. Nice boom for the
bottom end.
- 4 x 12" in a sealed box. Good tight response, but still has the bottom.
This could be used by itself quite nicely.
- 8" (or two) in a sealed box with a good horn tweeter. This would go best
used with the 15" cabinet, and an appropriate crossover. Maybe your amp has
one built in*. It will also be good for practicing by yourself. Nice & tight
response, and great if you play some funk style too.
* My Peavey does have a built-in adjustable crossover, but it's
pre-amp level. I then have to amp each side after that. One would get looped
back into the Peavey, and the other to a second power amp...
And hopefully you know the make and model numbers for those woofers.
That will be required if you want to build the best boxes possible for them.
I picked up the 2 speaker design books from Radio Shack to help with
the box design. Blaupunkt also has a basic DOS program to help with box
design too. The RS books had some decent rough size info for speakers, so I
assumed some average-low specs for my 12s went I calculated the box size. I
know the box is a little small for them. you can kinda hear it. But I don't
have the test equipment needed to find the real specs for these drivers, yet
:)
I'm working on a spreadsheet that has all of the formulas built in,
to help design different boxes. I'm not sure if I have it finished yet or
not, though...
--
--- David A Woyciesjes
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--- Yale University Press
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Received on Tue Jun 18 2002 - 09:20:18 BST