Elements Audio along side Matthew J Morgan Have designed and released our first ever free plan Speaker cabinet design

The 21 C2a Golden Formula Paraflex subwoofer achieves improved performance by the use of a Throat Chamber in conjunction with an increased rate of expansion in the Low-Tuned Horn resonator section... This increased gain/sensitivity & output within the cabinet\'s working range typically comes at the cost of sacrificing some surplus upper extension. The 21 C2A has a playable range 30Hz to 90Hz with extreme spl.

The 21 C2a Took over 1 year to design and prototype, with the finished result being one of the best performing Paraflex models available as a free plan. There are detailed plans in both Metric and Imperial to follow, and a large number of detailed photos outlining the build process and build order.