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May 2021

Mobile Fidelity Sound Labs- Shawn Britton – Postponed

  May 25, 2021 @ 8:00 pm - 8:30 pm


Stay tuned for updates on this event!


June 2021

South Bay Event at Phil’s House

  June 12, 2021 @ 1:30 pm - 5:30 pm

A year ago our last scheduled open house for SFAS members was cancelled due to COVID concerns, but we are now ready to try again.

Those of you in the south bay, or who are willing to travel to San Jose, are welcome to visit.  Due to health concerns, *to attend you must be vaccinated, but beyond that, please come and have fun.  Drinks and refreshments will be provided.

Where:  Details provided when reserving your spot. 


SFAS Presents Frank Doris – Editor of PS Audio’s Copper Magazine

  June 27, 2021 @ 3:00 pm - 5:00 pm

Join us for what most assuredly will be an interesting and informative afternoon with Frank Doris.  Besides being a truly great person, Frank’s vast experience across many facets of the audio world will provide some fascinating conversation.  Here’s a brief intro from Frank:

“I’ve been an audiophile since I was a teenager and always interested in sound, although I couldn’t afford any good gear until after college. I worked for Harry at TAS for about seven years and wrote for them a lot longer,


July 2021

John Curl in Ashland, OR

  July 18, 2021 @ 4:00 pm - 7:00 pm

Join us for a social get together, listening session (hear the new MBLs!) and special guest, John Curl at Leslie and Grant’s home in Ashland, Oregon.

This is a free event for members of SFAS.  The address will be provided to those who have RSVP’d.


October 2021

In-Person Single-Driver Speaker Event, San Jose

  October 9, 2021 @ 11:30 am - 2:00 pm

The highlight of this event is “single-driver speakers” introducing the Sibelius speakers from Pearl Acoustics. We will listen to two systems: first a brief listen to a DIY amp and single-driver speakers followed by a more extensive listen to affordable commercial equivalents. The goal is to dispel the notion that modern single-driver speakers are “very limited”. This is definitely not your father’s Oldsmobile . . .

Place: near Montague Expressway and River Oaks Dr., San Jose. 


November 2021

Linkwitz LX521-4 Reference Speakers Event In Healdsburg

  November 6, 2021 @ 10:00 am - 4:00 pm

Join us for an opportunity to hear the latest version (revision) of the Linkwitz open baffle LX521-4 The Reference speaker system (https://linkwitz.store/product/lx521/).  With new drivers, newly re-designed analog active crossovers and power amps resulting in a speaker system that sounds truly exceptional!

Here’s an excerpt from a review of the LX521 The Reference speakers by Jack Vad, San Francisco Symphony, GRAMMY winning Producer & Engineer:

“I didn’t have any other speakers that could reveal as accurate a sound stage,


Second Date Added: Linkwitz LX521-4 The Reference Speakers Event In Healdsburg

  November 14, 2021 @ 10:00 am - 4:00 pm

Back by popular demand, a second Linkwitz LX521-4 Speaker event has been added.

PLUS, Dr. Frank Brenner is planning on attending the event in Healdsburg.  Dr. Frank Brenner, who has taken up the administration of Linkwitzlab.com from his hometown of Stuttgart, Germany.  (Siegfried Linkwitz passed away in 2018.)

Frank left a career as a physician to become an airline pilot for Lufthansa, and currently makes not-so-regular flights to California. His interest in building speakers led him to research on the Internet and,


January 2022

Atma-Sphere Founder Ralph Karsten

  January 23 @ 2:00 pm - 4:00 pm

Join us for an interesting and informative afternoon with Ralph Karsten, founder and CEO of Atma-Sphere. Ralph will discuss his background, how he got into the HiFi business, his unique approach to amplifier design and the latest product line he’s working on – a class D GaN amplifier.  It should be an fascinating discussion how he’s decided to add such a different design choice in comparison to his OTL tube amplifiers.

From their website:

Atma-Sphere is a small company in Saint Paul,

Zoom Meeting CA United States

May 2022

Educational Learn and Listen Class – Phono Stage Design Basics, By Ori Mizrahi-Shalom

  May 21 @ 10:00 am - 3:00 pm

This will be a two-part experience (there will be a separate announcement for those members who only want to participate in the listening session and not in the class):

  1. A class on the design basics of phono stages from 10:00 to 11:30 AM PST
  2. Lunch – there are several locations for lunch nearby
  3. A listening session of a number of different sub-$1000 phono stages from 1:00 to 3:00 PM PST

This event will be held in-person in San Jose.


Phono Stage Listening Session, By Ori Mizrahi-Shalom

  May 21 @ 1:00 pm - 3:00 pm

This is the listening session after the phono stage basic design class in the morning.  Listen to some DIY and inexpensive commercial phono stages.

Intro 10 min

Main Phono Units:

Jim Hunton’s Pass DIY Pearl II, separate power supply with shunt regulators, Dayton foil/film caps, DC servo. ($800 total, 20 min main focus)

Hagerman Cornet tube phono stage, including tube rectifier, added zener shunt regulation and NOS tubes. ($800 total,

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