Afer 30+ years exploring the high-end....I would list three that influenced myself...and, at least, a couple generations of "audiophiles". 1.The original Advent loudspeaker...without peer when it comes to having spawned both manufacturers and consumers to a seek more from recorded music. 2. The Dahlquist DQ-10..without this speaker there my not have been Theil, Wilson and many, many others...and it gave Saul Marantz another last fling with home audio. 3. The Magnepan MG-20, quite simply a $30.000.00 set of speakers,..for $10.000.00