It is simply not true... Some improvements were made in drivers, but that doesn't neccessarily make a better or cheaper speaker. The same goes for amps, which haven't changed in ages, except for new class D/T technology (switching amps), which is exciting. These also have not gone down in price (except again, the D/T amps).

As for CD-players: they have gotten more expensive but WORSE since the 80's/90's... Better specs and more hifi, less music...