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- Series 6 - Vandersteen,
Threshold Audio, Zanden, Denon
- Series 5 - Ensemble, Samsung,
Sonus Faber, Atma-Sphere, Pro-ject
- Series 4 - Esoteric, Gryphon,
Mobile Fidelity
- Series 3 - Wilson Audio, Lamm
Industries, Pluto Audio Products, Eastern Electric, Solid Acoustics
- Series 2 - Focus Audio, Verity
Audio, Conrad-Johnson, Von Schweikert Audio, Clearaudio
- Series 1 - Amphion, Jeff
Rowland Design, Shunyata Research, VTL, Spherex
- Marc Mickelson, Doug Schneider, Jeff Fritz, Roger Kanno, and
Doug Blackburn.
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