Here are some of the guests & companies that have given presentations:

• Abbington Music Research - Darren Censullo
• Ack! Indusitries - Chris Own
• Acoustic Dreams - Bruce Fetherling & Brian Urfer
  
• Acoustic Reality - Eric Heider
• Acoustic Technologies LLC - David Lesht & David Maeshiba
  
• Alan Hendler - former recording engineer
  
• Alan Kimmel - tube amp/preamp designer
• Archon Audio - Mike Kay
  
• Art Audio - Joe Fratus
• Artisan Fidelity - Christopher Thornton
  
• Atma-Sphere - Ralph Karsten
  
• Audio Alchemy - Mark Schifter
  
• Audio by Van Alstine - Frank Van Alstine
  
• Audio Machine & Design - Brent Riehl & Robert Maicks
  
• Audio Matiere - Ron Hedrick
  
• Audio Note - Herb Reichert & Michael Trei
  
• Audio Services Corp. - Paul Lacey
• Bag End Loudspeakers - Jim Wischnmeyer
• Balanced Audio Technology - Victor Khomenko & Steve Bednarski
• Bamberg Engineering Sound Labs - Steve Fay
  
• Berkley Audio Design - Mick Survance
  
• Birdland Audio - Gilles Gameiro
  
• Bizzy Bee Tube Audio Design - Larry Musial
• Black Moon Audio (Sonic Hemisphere) - Dave Maletz
  
• Blue Smoke Entertainment
• Bound for Sound - Martin DeWulf
• Bricasti Design - Brian Zolner
  
• Cary Audio Design - Dennis Had
  
• Cedille Records - James Ginsburg & Bill Maylone
• Cerious Technologies - Robert Grost
  
• Champagne Audio - DUane Randleman
• Classic Audio Reproductions - John Wolff
  
• Classic Records - Michael Hobson & Coleman Brice
  
• Controlled Thermal Processing - Rick Diekman
• Cosmos Design - Bob Clanfield
  
• Creative Cable Concepts - Bill Eisen
  
• Custom Power Cord Co. - David Blair
  
• David Gill Elise DAC
  
• Decware - Steve Deckert
• Deluxe Audio Video - Bob Servos, Jack Shafton
• Dodd Audio - Gregg Straley
• Dr. Feickert Analog Products - Brian Walsh
  
• Dunlavy Audio Labs - Geoffrey Poor
  
• Edgarhorn - Dr. Bruce Edgar
• The Edge Home Entertainment - Ray Mazeika
  
• ELP Laser Turntable - Sanju Chiba
• Essential Audio (AMR, Transmission Audio)- Brian Walsh
  
• Final Laboratory - Brian Bowdle(Venus Hi-Fi)
• First Watt (Pass Labs) - John Ver Halen
• Golden Ear Technology - Jack Shafton
  
• Golden Tube Audio - Frank Malitz
  
• GR Research - Gregg Straley
• Great Northern Sound - Steve Huntley
  
• Grommes Hi-Fi - Albert Shippits
  
• Herron Audio - Keith Herron
• Holistic Audio Arts - Jack Caldwell
  
• Huff Loudspeaker Co. - John Huff
• Illinois Institute of Art - Mark Malboeuf
  
• Immedia - Sedrick Harris
• Janszen Loudspeaker - David Janszen
  
• Joseph Audio - Jeff Joseph
  
• Joule Electra - Jud Barber
  
• Kosiba Technologies (David Berning Electronics) - Kris Kosiba
• Krell Industries - BillMcKiegan
• Kuzma - Peder Beckman
  
• Legacy Audio - Bill Dudleston
  
• Living Voice Speakers - Brian Bowdle(Venus Hi-Fi)
• Lowther America - John Ver Halen
  
• Lyman Flook - recording engineer & college instructor
• Machina Dynamica
  
• Madisound Speaker Components, Inc. - Larry Hitch
• Marantz - David Birch-Jones
  
• Marigo Audio Labs - Ron Hedrick
• Martin Logan - David Penrod & Dennis Chern 
  
• Melos Technologies - Sedrick Harris
  
• Merlin Music Systems - Bobby Palkovic



• Midwest Audio (Coincident Loudspeaker) - Jason Walker
  
• Mobile Fidelity Sound Lab - Joe Bermudez & Thomas Enwright
• Morningstar Audio Imports - Bill O'Connell
  
• Musical Design - John Hillig
  
• Musical Direct - Joshua Bizar & Bes Nievera
  
• Naim Audio - Chris West
• N.E.W - Mitch Friedman
  
• Nola - Sedrick Harris
• Nomad Audio - Paul Hilgeman
• NuForce Audio - Tim Shelton
• Odyssey Audio - Klaus Bunge
• Ogre Sysytems - Larry Hepinstall
• Omega Loudspeakers - Zachary Stanger
• Pacific Valve - Joe Jurzek & Joe Degidio
• Paller Specialty Audio - Harry Paller
• Paradigm - Jack Shafton
• Parasound - Richard Schram
• Performance Devices (King Sound Electrostatic speakers) - Roger DuNaier
  
• Perpetual Technologies - Mark Schifter & Peter Madnick
• Pro Musica - Ken Chritianson
  
• PS Audio - Paul McGowan
• Purity Audio - Joe Jurzek
• Quintessence Audio - Mick Survance
  
• Ray Samuels Audio - Ray Samuels
• RBS Consultants (IMMERSAV Binaural audio with HD video) - Robert Schulien
  
• Reality Cables - Gregg Straley
• Ridge Street Audio - Robert Schult & Steve Rothermel
  
• Rosinante - Ric Cummins
• Salk Sound - Jim Salk
• Sanders Sound Systems - Roger Sanders
  
• SAS Audio Labs - Steve Sammet
• SDL Audio - Donald Smith
  
• SEAS North America - John Stone
  
• ServoDrive-Sound Physics Labs - Mark Seaton & Tom Danley
• Signature Technologies - Brian Bienfang & Rick Elsworth
• Simplifi Audio (Gradient Helsinki Loudspeakers, Bladelius Electronics) - Tim Ryan
• Sjofn Hifi (Clue Loudspeaker, Hegel Electronics) - Paul Lawless
  
• Song Audio - Song Kim
• Sonic Frontiers Anthem electronics - Jack Shafton
• Sonus Faber Speakers -  Mick Survance
  
• SOTA Industries - Jack Shafton
  
• Soundline Audio speakers
  
• Sound Lab - Dr. Roger West
  
• SP Technology - Bob Smith
• Spatial Audio - Clayton Shaw
• Specimen Products - Brian Walsh
• Stereophile - Michael Fremer
  
• Supermods - Stan Warren (taped) & Gregg Straley
• Sweetwater Sound - Sam Rodgers
  
• Symphonic Line - Klaus Bunge
  
• Synergistic Research - Scott Nowak
  
• TacT Audio - Peter Lyngdorf
• The Tape Project - Dan Schmalle (Doc Bottlehead)
  
• Technik Avant Garde - Harry Paller
  
• T.G. Audio - Bob Crump
• Theta Digital - don Youngstrom
  
• tmh-audio - Jim Ricketts
  
• TLG Acoustical Designs - Ken Platz
• Toska Audio - Peter Mulligan
  
• Totem Acoustic - Vince Bruzzese
• Ultimate Audio/Video  - Ron Lapporte 
• UltraFi - Larry Moore
• Van L Speakerworks - John Van Leishout, Trent Lesher, & Charles McShane (of AR fame)
  
• Venus Hi-Fi - Brian Bowdle
  
• Vacuum Tube Logic - Luke Manley
  
• Von Schweikert - Mike Bosela & Rusty Taub
  
• Wadia Digital - Martin Cooper
• Waveform Acoustics - John Otvos
  
• Welborne Labs - Ron Welborne
  
• Wilson Benesch - Brian Tucker
  
• Wisdom Audio - Tom Bohlender
  
• World Audio Design - Ric Berta
• Zu Cable - Sean Casey & Adam Decaria 
  Zu Cable