Project Time: 20+ hours
Project Complexity: Hobbyist
Project Cost: $100-$500

Driver Selection
I am using the Dayton Audio DA115-8 for the woofer and the Vifa OX20SC00-04 3/4″ Fabric Dome for the Tweeter.

Enclosure Design
The design of the enclosure was to emulate a dragster motor as close as possible and still keeping it simple.

Amplifier/Crossover Configuration
The woofer is a second order parallel circuit and the tweeter is also a second order parallel circuit with a series R/L filter before it. The drivers are crossed at 3KHz. The system impedance averages 8ohms.

Enclosure Assembly
The enclosure is 3.1 liters in size and made entirely from MDF other then the exhaust port tubes which are made of plastic electrical conduit. The blower, air scoop and oil pan are hollowed out for more cabinet room and also to keep the enclosures as light weight as possible. The valve covers and oil pan are removable, for access, through the woofer cut out. The tweeter is siliconed into a recess with a thin laminate trim ring over top.

Conclusion
I could not be happier with this design. It surprisingly reaches fairly high volumes and digs fairly deep for such a small speaker. It has very nice imaging as well as a wide sound stage.

About The Designer
Dave Pellegrene is a remodeling contractor and has been in the business for over 30 years. In his free summer time months, Dave competes in water ski jumping tournaments. His favorite part of speaker building is cabinet design.