The driver used in the subwoofer is 10 inches (25.4cm) in diameter, is rated at 125W RMS and uses a voice coil that's 50mm in diameter. It costs $99 (you need two for this design) and is available from Jaycar.
In March 2003, we presented the "Little Dynamite" subwoofer - an easy-to-build design that used a
single 10-inch driver in a 25-litre ported enclosure. At the time, we said that
we'd later be describing a larger, higher-powered subwoofer and this is it.
This new subwoofer is a flow-on from the previous design, where
many different enclosure variations were modelled using BassBox speaker design
software. It uses not one but two 10-inch Jaycar drivers, two 25-litre pre-built
sealed enclosures and two ports. The two 25-litre enclosures are combined to
make one unit with a capacity of 37 litres and we'll look at just how this is
done shortly.
The resulting enclosure is longer than before and this has
allowed us to use longer ports. This, in turn, has allowed the box to be tuned
to a lower frequency which benefits the bottom-end response. In addition, the
use of two drivers increases the sensitivity and power handling of the finished
subwoofer.
Another benefit of the new design is that if you built the
previous unit and want to upgrade, you can do so without starting all over
again.
