For one project, I adhesed a 1/4" piece of plywood over the upper half of the baffle, leaving the 10" woofer cutout intact, then I *hacked* the cutout for a cheap CD-ish horn with a 1.8kHz piezo driver. With a simple x-over I designed, a new Pioneer woofer, some paint & hardware, my father's old speakers came back to life. They actually sound pretty good with some EQ!