Well I usually never find anything but plastic Aiwa and Panasonic speakers at Goodwill. However I had a little luck last night. Nothing that spectacular, but better than plastic speakers. And an
Micro Acoustics FRM-1 loudspeakers! for Sale in Virginia Beach, VA - OfferUp
Pair(2) Rare Vintage MA Micro Acoustics FRM-2A stereo Speakers-Works Great | eBay
RARE MICRO ACOUSTICS 1-ax MADE IN USA HIGH END VINTAGE LOUDSPEAKERS FOR HOME - YouTube
Pickup Mass Only - Vintage Micro Acoustic MA FMR-1AX Speakers | Reverb
Vintage Micro Acoustics 1-ax Speakers - Local Pickup Only | eBay
Photos of Ma Micro-Acoustics speaker - Members Pictures - Speakers, Electronics, etc. - The Classic Speaker Pages Discussion Forums