フィリップス スピーカーカタログ PHILIPS MFB SPEAKER SYSTEM STUDIO MONITOR 3種セット(一般)|売買されたオークション情報、ヤフオク! の商品情報をアーカイブ公開 - オークファン(aucfan.com)
Why do passive speakers still exist? | Page 19 | Audio Science Review (ASR) Forum
Plexus Records - 🔊 Outstanding Philips 532 speakers... | Facebook
Philips "fish eye" amplifier. Appr 1976. And the famous Motional Feedback ( mfb)-speakers, great product from Philips sound engineers in the sev… | Scultura, Anni 50
Pair Original Philips 532 Motional Fdbk MFB speaker | #140401165
Servo-Control in Mainstream Audio: From Motional Feedback to the Bend-Sensor | audioXpress