For sale: 1 ea. Radio Shack Model DSP40 dsp-equipped "loudspeaker" (p/n 21-543). Never used, only tested. In original box and packing material. Works FB. $28 plus shipping. Vy 73, AI2Q, Alex in Kennebunk, Maine QRP-L #687 http://users.adelphia.net/~alexmm/ai2q.htm .-.-.