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Old 14th June 2013, 03:47 AM   #1
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Default Hypothetical Stepped Baffles

This is just a "for the heck of it" conversation, so don't bother asking what I'm trying to build. Let's say you're designing the woofer and mid (cones) part of 3-way, and you want to align acoustic centers perpendicular to the ground, and you need a pretty significant difference from a flat baffle. What do you think about these strategies? The pink is absorption.

Yes, I know driver selection / crossover point / crossover slope / directivity strategy could play into some of these. That's fine. Just think about which one would work best for sort of 3-way you like (and let us know what you're thinking of), for example.

I've skipped the tweeter to keep it focused, and I've still called it a 3-way because I want to imply a fairly low crossover point.

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Old 14th June 2013, 05:54 AM   #2
AllenB is offline AllenB  Australia
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I like the last one. It deals better with the problem before using absorption.
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Old 14th June 2013, 05:20 PM   #3
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^ Ditto
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Old 14th June 2013, 07:25 PM   #4
boris81 is offline boris81  United States
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Here is an article by Troels Gravesen http://www.troelsgravesen.dk

I think he ended up with this

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Old 14th June 2013, 09:12 PM   #5
Loren42 is offline Loren42  United States
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Every sharp edge transition will subject the sound wave to diffraction.
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Old 14th June 2013, 10:32 PM   #6
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True, but if you point the whole lot upwards slightly, you're listening to the off-axis of the drivers, which might not be desirable depending on crossover frequencies vs driver diameter etc etc.

Chris
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Old 14th June 2013, 11:11 PM   #7
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boris81,
I built baffles that looked very similar to what you are showing for JBL many years ago. What was different is that the entire front of the baffle was molded flexible foam over a wood substrate to help damp the front first reflections. It was called the JBL-XPL series of speakers at the time.
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Old 14th June 2013, 11:36 PM   #8
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by Kindhornman View Post
boris81,
I built baffles that looked very similar to what you are showing for JBL many years ago. What was different is that the entire front of the baffle was molded flexible foam over a wood substrate to help damp the front first reflections. It was called the JBL-XPL series of speakers at the time.
Yes, I understand that 1/4" or 3/16" felt does similar things.
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Old 14th June 2013, 11:40 PM   #9
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Loren42,
Your probably correct but the molded face just has a more integral look to it. It wasn't easy I'll tell you that.
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Old 17th June 2013, 04:48 PM   #10
boris81 is offline boris81  United States
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Troels found that the rounded shape stepped baffle affected the tweeter response the least.

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