I was just thinking about something odd today, there are a few historic speaker makers that have basically kept their launch speaker lines basically intact. They may have launched newer lines, or introduced a premire line, but they kept the originals around or updated them in someway, but you still know where they came from - here are the makers tha I've seen do this:
Definitive Technology - BP series - The winner of the Bipole War (Mirage being the vanquished foe - but they were great speakers too).
Wilson Audio - almost every speaker is a newer incarnation of their older ones
Klipsch - Heritage series 60 years old and still kicking'
Magnepan - always planar, always sweet
Martin Logan - ESL ... Excellent Sound Longevity
Ess Audio - The Heil tweeter patent expires and everyone jumps on board
B&W - 800 series ...nuff said
Do you guys know of any other speaker makers that have kept their original design concepts for a very long time and people still buy them? Goes to show ... They must have did something right the first time out
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Let's chime in people!