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1/15/02.
This box was a deviation from the designs I had been doing. I had been on a real bad ported kick for a while. Then I had come across a deal for a set of 10" speakers I saw potential for.
I think it was for $35 a piece plus shipping, I picked up a pair of Crunch Fat Boys model DS-10e. I have a spec sheet for them, which is NOT listed on the HiFonics/Crunch site. In any case, I had an idea for the 10's to drop them in a small sealed box. I figured the 2 Crunch 10's could out-do the average MA-Audio crap that has been floating around my area for a little too long now. Especially when powered by the Rockford bd1000 amp.
I plugged the numbers into the Speaker Box Calculator I created, based on equations available on www.diysubwoofers.org. For the desired Qtc I wanted of around 0.85, I only needed (from memory here) approximately 0.7 something cubic feet of space. I chose the 0.85 figure based on the desire for better power handling. This was just too small, I'd never turn a head with that, and the Fb of the enclosure hovered around 70hz, not what I call suitable. I kept plugging the numbers until I could get the box's Fb lower, no higher than 60hz or so, at worst. Well, I ended up with a Qtc of 0.807, maybe a little higher, and the net internal volume needed ended up being 0.88 cubic feet. Give or take.
I designed the box to sit flush with the panels of a Dodge Shadow. Where it was shallow enough to still allow access to the spare tire, and have valuable trunk space. (The whole premise of the idea was to have a SMALL box) External box dimensions calculated to 36" wide x 12" tall x 6" deep. I used 3/4" "Nova Ply" or high density particle-board. Not by choice, went looking for MDF, but no one had any. The pictures below are of the box in building stages. If you look closely, you can see the painted glue on the panels. All panels were painted with Titebond II glue, externally and internally to add rigidity to the box. Internal space was very limited and did not allow for much internal bracing, so I needed a way to stiffen the sides.
The update here is basically that the desired Crunch Fat Boys were substituted for PPI C1 10" subs. The specs are a bit different, but SQ performance is incredible. I will post output results.
This is a view of the top of the box as I was glueing the baffle on. If you look closely, you can see the glue painted onto the top of it, still wet.
Here you can see the construction of the inside joints, and the amount of glue that is present. Anyone who has worked with wood glue knows what it takes to get that sustained orange color that dark.
For those of you that can't translate dimensions, or just can't imagine. This is the relative size of the box as opposed to a standard 12V drill. In the back you see the near empty bottle of glue, and the black figure is one of the PPI C1 10" I was talking about.
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