Help with FUN science fair project

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Milkduds

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Joined 2004
I'm helping two sons with a science fair project (7th/9th grade) this fall. We've decided (ok... I've decided) to do a simple project that answers 2 questions. What cabinet design plays the loudest (most efficient) and has the best bass response. The dependant variable will be the MCM 55-2421 driver (only because I need to buy one!). I need help coming up with as many cabinets as I can, within reason. We will build simple, not pretty, cabinets and test outdoors. I'd like 6 or 7 designs, maybe one or two that are a little odd. Maybe a long piece of PVC, cardboard box, or something. I already know the winners but I want my sons to learn for themselves. Here's my list so far.
Cabinets:
Air suspension
Bass reflex (one, maybe two alignments)
Bandpass?
Infinite baffle
Front loaded horn (already have an autotuba I built that needs a new driver)
Tapped horn


What is top end frequency you would suggest for the test?

Please help a dad out!

Jim D.
 
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Milkduds

Member
Joined 2004
HTML: 
The 55-2421 is not what I would call a flexible driver. How did you kill the one you had?

The surround on the first one separated from the cone after much use in the autotube in my older son's 4 runner.. and one month after the warranty ran out.

HTML: 
Is this going to be a single driver full range project?
No, defnitely not a full range project. This is more of a bass/subwoofer project so I'm thinking of 250 hz and lower although I know some of the designs will roll off well below 250 hz. It will not hurt to plot some higher frequency points just to teach.

Jim D.
 
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