Vintage Philips speakers, why I am hunting them so hard now

I previous reviewed the Philips 22rh497 and for a second hand price between 20 and 75 euro that speaker is together with the Technics SB 4500 among the best second hand speakers you can buy under 100 euro. In that previous video "The best second hand speaker under $100 / link:    • The best second hand speaker under $100   "I explained why this techncs SB4500 is such a bargain and good sound. The Philips 22rh497 is from the same quality but with a completely different sound. I now try to score it's bigger brother with 9 drivers the Philips 22rh499 One of the most sought speakers in Vintage land. Also in this video you see a very rare speaker from Kummer electronica, a dutch speaker company what operated in the 60's and already long forgotten. You see a unique speaker from Kummer electronica the U-10