Keystone Speaker

The Keystone speaker was the first loudspeaker designed, intended to be usable as a standmount.

The first model was a MTM design utilising the Seas H1499-06 27TBCD/GB-DXT driver and 2 x 12MU/4731T00.

The woofers were Dayton DCS165-4.

The Seas tweeter was chosen for directivity matching, and the dual midranges were an attempt at an MTM design.  The Dayton woofers were one of only few subwoofer drivers suitable for small sealed enclosures.