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Open Baffle Epiphany!

Hi All,
I'm venturing into OB territory for the first time.
I have a couple of Alpha 15a's on order. Can anyone suggest a baffle design and size to start?
Would these drivers be a good choice for an H frame?
I have some spare mids and tweets hanging around doing nothing useful that I would like to integrate into the build.
I guess I'm looking for suggestions.
Thanks!
 
My H-frame Alphas consist of an open ended box with all internal dimensions being 17 inches. The Alpha is mounted on it's separate baffle located in the center of the box. I used 3/4 plywood. Since it's modular you can built an inverted T baffle which can sit on top of the H-frames and try any number of different full range speakers in them. Notice I said full range drivers as that's what most builders use. Spare mids and tweets may not cut the mustard.

P9160028.jpg
 
Go to Martin j king's quarterwave website and look for project 19.
I can send the link later if you can't find it. That's what I built and it sounds amazing!
 
Poultrygeist said:
My H-frame Alphas consist of an open ended box with all internal dimensions being 17 inches. The Alpha is mounted on it's separate baffle located in the center of the box. I used 3/4 plywood. Since it's modular you can built an inverted T baffle which can sit on top of the H-frames and try any number of different full range speakers in them. Notice I said full range drivers as that's what most builders use. Spare mids and tweets may not cut the mustard.

P9160028.jpg
Click to expand...
 
Thanks for the advice.
I'm good with Full Range drivers up top.
May I ask what FR driver you use in that H frame?
 
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rogerfederer said:
Go to Martin j king's quarterwave website and look for project 19.
I can send the link later if you can't find it. That's what I built and it sounds amazing!
Click to expand...
I have seen that site before. He has Project 9 available there with the Alpha 15a and a Fostex Full Range on a 20" x 38"
baffle.
 
I've been there many times and for some brain fart reason can't seem to find the projects page.
A post with a link would be greatly appreciated.
 
The TB 1808 garners pretty good reviews. They are pricey but I guess you get what you pay for.
Did you isolate the "inverted tee" from the H frame at all? Is vibration a problem?
Two very good friends of mine are Fighting Gamecocks.
 
I used stick on felt pads between the the H-frames and inverted T-baffle but there's little to no vibration. I've also used rubber feet when I wanted to gain some extra height.
 
I've recently tried some full range drivers of various sorts and they have really caught my ear. But I've not yet tried an open baffle design.

Couple of questions: 1) About the largest driver I can accommodate in my space is an 8 inch, something like Wild Burro Betsy or Pioneer BOFU/clone... or perhaps an EV LS8 or similar. Any idea what the minimum width of the front baffle could be with such drivers?
2) A lot is talked about increasing the bass when using the OB design. If I have a subwoofer already, how does that affect the actual design of the open baffle in my case here?

I've read/looked through at least half of this thread with great interest. Thanks!!
 
hnash53 said:
I've recently tried some full range drivers of various sorts and they have really caught my ear. But I've not yet tried an open baffle design.

Couple of questions: 1) About the largest driver I can accommodate in my space is an 8 inch, something like Wild Burro Betsy or Pioneer BOFU/clone... or perhaps an EV LS8 or similar. Any idea what the minimum width of the front baffle could be with such drivers?
2) A lot is talked about increasing the bass when using the OB design. If I have a subwoofer already, how does that affect the actual design of the open baffle in my case here?

I've read/looked through at least half of this thread with great interest. Thanks!!
Click to expand...
I've been thinking the same thing, and was wondering if it would be practical using subs or bass cabs with two small 'satellite' OB's
Let's say your sub picks up at 100 hz, how wide would a baffle need to be at minimum to get the OB down to that frequency.
There has to be a chart somewhere, after all it's the internet. I just have no idea what to look for.
 
valvenator said:
I've been thinking the same thing, and was wondering if it would be practical using subs or bass cabs with two small 'satellite' OB's
Let's say your sub picks up at 100 hz, how wide would a baffle need to be at minimum to get the OB down to that frequency.
There has to be a chart somewhere, after all it's the internet. I just have no idea what to look for.
Click to expand...
Yeah... hopefully we'll get some answers re this bass stuff.
 
If you have a sub the width of the baffle is much less critical. Large baffle size is mostly scheme to capture the bass.
 
As long as the bass is augmented I don't see a great need for wide baffles. I heard these OB's or NB's a few years ago at Hornfest and they were beyond amazing. Not my taste in music though.

 
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