A horn loaded sub in a car? Traditional theory says horns are too big to fit in a car, but traditional theory dates from the 1940's. AutoTuba is a bass horn that can be loaded with an eight or ten inch long throw woofer.
Using a driver that small means you can get a full seven foot long horn in a package small enough (14x15x32 inches) to fit in your trunk. But the small size doesn't mean a small sound. The AutoTuba easily
beats commercial subs. Here's what builder Bruce Klemz
said about his:
"Wonderful, way better than I hoped. Smooth, deep bass. Much better than
the 15" ported box they replaced - very musical.”
Check out this SPL chart, comparing the in vehicle response of the AutoTuba, loaded with a $35 eight inch woofer, to an average twelve inch commercial sub:
The AutoTuba runs on average 10dB hotter than a store bought sub, and that means it sounds twice as loud. But it won't cost you twice as much. You can build your AutoTuba for less than $100, complete.
AutoTuba also may be built in a taller 20" x 22" x 15" version, for spaces where a higher box is a better fit, like in between the seats of a van. Both versions are included in the plans.
Tall Auto Tuba
Drive a pickup truck? AutoTuba probably won't fit in your ride, but this
TruckTuba has similar response to AutoTuba in a narrow box. The side dimension is 24 x 36 inches, and it can be made as shallow as 5 inches, to fit behind the seat of most pickup trucks. It shares the same driver options as AutoTuba, all that differs is the cabinet shape.
AutoTuba and TruckTuba are two separate plans; you must specify which plan you’re ordering.
Construction Degree of Difficulty: 5
Performance Quotient: 7
Equivalent Retail Value: $ 699
Plans are $14.95, delivered within 24 hours as email attachment in MS Word
format. 17 pages, 36 diagrams. PDF available on request.