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Multi-Way Conventional loudspeakers with crossovers

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Old 13th July 2008, 09:27 AM   #251
Pano is offline Pano  United States
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Welll I tried and tried to come up with a nice, simple crossover for this (on paper).

But it's not happening.

My best advice is to go with the Hammer Dynamic X-over for the Beta LTA and about 2uF on the Selenium tweeter.

That means a 6 element crossover for the LTA and 1 element for the tweeter. Not the most simple, but it could be worse.

Perhaps you could leave out the RLC trap filter on the LTA to begin with, but I'll bet you're going to want it.
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Old 25th July 2008, 08:25 PM   #252
Variac is offline Variac  United States
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Well, I whipped together an idea with an inductor on the woofer to tame the rising mids, and a second order on the tweeter corresponding to where the woofer rolls off and we'll see...
Actually Nelson, (not Pass!) the guy making this, has put the crossover together and says its OK. I haven't heard it yet. I hope he posts here with some pics soon...
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Old 25th July 2008, 09:47 PM   #253
N Brock is offline N Brock  United States
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thanks to variac and many hours in the shop, my pair is done!
some pictures:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.Click the image to open in full size.

i tested them using some questionable materials (like romex) but they sounded very good

today i will be bringing in some better equipment and re-listen to them
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Old 25th July 2008, 10:25 PM   #254
Variac is offline Variac  United States
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Here's the tweeter:

http://www.partsexpress.com/pdf/264-360.pdf
http://www.partsexpress.com/pe/pshow...60&ctab=2#Tabs




Way to go N-Brock!!

If you guys remember, we designed these BBBIB's for a youthful Mr. Punkrockr a while back who wanted lots of bass. Mr. N-Brock is about the same age as Punkrockr, so finally the design has accomplished its intended goal.. Rock On!
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Old 26th July 2008, 01:11 AM   #255
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Fantastic! I would like to put some of your pics on the BIB website. May I?

Here's the latest BIB calculator:

http://www.zillaaudio.com/bib-calculator.htm

Godzilla

PS. I think your driver combo is great!
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Old 26th July 2008, 03:07 AM   #256
badman is offline badman  United States
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Default I'd lose the whizzer

No need for it when you've got a supertweeter.
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Old 26th July 2008, 04:06 AM   #257
Variac is offline Variac  United States
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recommended crossover of tweeter is 5k
Well, there are various recommended frequencies. One being 3.5k but from talking to various people experienced with slot tweeters, and other so-called super tweeters, (which is only in the PA sense because they really don't even make it to 20k) they recommend crossing over pretty high- like 5k.

Which is worse, a tweeter straining to go low or a whizzer cone woofer trying to go high? In this case I made my choice, seems a tweeter under stress would be the more harsh and annoying possibility... I also considered the Eminence Beta without the whizzer with a horn driver and waveguide but the costs started to mount up, and this is supposed to be a fun speaker that high school people can afford to build ( especially if they stumble on some plywood! )
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Old 26th July 2008, 05:22 AM   #258
N Brock is offline N Brock  United States
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Default Re: I'd lose the whizzer

Quote:
Originally posted by Godzilla
Fantastic! I would like to put some of your pics on the BIB website. May I?
Of course you may, if you'd like i have pictures of other BIB's we've built including the 6" and 8"

this project has made me all giddy, now i want to do a larger pair
(bigger is better, right?)

the new source and amp sound much better for those of you wondering, originally it was an ipod and an old McIntosh amp
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Old 26th July 2008, 05:56 AM   #259
Pano is offline Pano  United States
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Very Cool! Those should really rock when you get them in the corners.

What did the x-over values end up at?
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Old 26th July 2008, 06:02 AM   #260
N Brock is offline N Brock  United States
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Quote:
Originally posted by panomaniac
Very Cool! Those should really rock when you get them in the corners.

What did the x-over values end up at?
there is a small problem with the corners, mainly they are full of junk, but that can be fixed, already they are way high on bass

the x-over would be variac's deal, i just assembled what he told me to
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