The Amp Hour

An Interview with Nash Reilly

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Welcome, Nash Reilly of Sonos!

  • Chris and Nash met at OSHWA 2018
  • Nash is from Montana and went to engineering school at Montana State University.
  • His first job out of school was at Micron over in Boise, doing SO DIMM testing for large scale customers.
  • He actually tested for things like Cosmic Ray strikes, discussed many times on this show.
  • Interned at Sonos when it was 100 people
  • Watching how the vendors change their tune as you get volume up
  • His role at Sonos started in sustaining engineering
  • Making sure supply chain is stable
  • Spent 4-5 weeks per year in China, even had to leave vacation to fly to China.
  • "Type 2 fun"
  • Smoke jumpers for Intel
  • Hank Zumbahlen episode
  • Staying well grounded
  • Lee Hill's Silent Solutions
  • I2S clocks hurt emissions, are often a problem during testing.
  • Blog post about emissions
  • Solutions for I2S clocks
    • Changing the output impedance of your driver
    • Put a small external RC filter
    • Howard Johnson on the podcast
    • First 20 pages of the Black Magic book
    • Most DACs/ADCs aren't as finicky as they used to be
    • I2S is just SPI in one direction
    • Sigma Delta DACs
    • Oversampling and modulating in the reverse direction
    • THD is like a noise measure, but also has distortion
    • Audio Precision test equipment
    • Analog Dialogue
    • Charty Party
    • 30 ms for it to be instantaneous to a human
    • Humans are more sensitive to phase delta
    • Latency is constant for digital signals
    • 3rd edition of AoE
    • ADI AN-283
    • The Way Things Work
    • How do you maintain quality over low quality speakers that are out there?
    • Clicks and pops
    • "A class D amplifier is just a motor driver with an LC on the output"
    • Layout starts to impact things
    • Chapter 8 of AoE for low noise design
    • Sonos Port
    • 20 people in his group, including digital, analog, layout
    • Current project has 10 people in total or so
    • 1600 total people working at Sonos
    • Sonos Amp
    • Had to do a custom class D amplifier
    • Needed to design in real time control
    • Sonos use Linux computers internally for the high level control
    • Microcontrollers for controlling other elements of the design faster
    • Nash is in charge of making sure the digital section is put together well and writing test plans
    • An example schedule: December start (talking with vendors), April schematic, June testing
    • For the Sonos Move, Nash worked on an earlier incarnation.
    • Nash's main site/blog
    • Find him on reddit
    • Nash is @cushychicken
      • ...more
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      The Amp HourBy The Amp Hour (Chris Gammell and David L Jones)
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