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The Choprical Fish: a Human Powered Party Bike

Step 13Create midrange enclosures.

Create midrange enclosures.
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MIdrange speakers and subwoofers respond to different frequencies. You don't want them to share the same airspace in a cabinet. If you do, the bass hits coming from the subwoofers will distort the vocals.

Because of this, I needed to create cups for the midrange. Pretty much any size would do. But they do need to be rigid, just like the subwoofer enclosures.

I had never tried vacuum-bagging before, so I decided to try it for the midrange enclosures. The process is pretty basic. You lay up the fiberglass in the usual way. Then, while the glass is still wet, you wrap the form in saran wrap, followed by a layer of 'breather cloth', and finally and outer plastic bag that you then tape to your vacuum tube. I used a regular vacuum cleaner and used the port to reduce the strength of the vacuum.

The outer bag did indeed suck the curing fiberglass to the inner form, making a nice, strong midrange cup.
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Author:fossilfool
Fossil Fool, the Bike Rapper, a San Francisco street performer and bicycle entrepreneur. Invented the Down Low Glow, a neon safety light for bicycles. Develop high-end sound systems for bicycles used ...
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