The recently renovated Philharmonie de Paris concert hall - which was re-opened just after the Charlie Hebdo attacks - was described by Guardian music critic Tom Service as "one of the most dynamic and exciting places to hear orchestral music in the world".
The team behind the Philharmonie sound is the Auckland-based company Marshall Day Acoustics.
Christopher Day and Sir Harold Marshall won the contract seven years ago on the back of their prodigious output of top-level designs all over the world for the past 35 years.
Chris originally studied Mechanical Engineering at Melbourne’s Monash University, and his love of music led him into the world of acoustic design.
Marshall Day's clients include architects, lawyers, luxury-yacht builders, planners, engineers, mining companies, local authorities and virtually anyone seeking creative ways to either enhance or reduce noise and vibration.
Many people will have experienced their work without even knowing it.
If you have visited Eden Park or Christchurch Airport, watched films produced at Peter Jackson's Park Road Post studios or basketball at Vector Arena, the sound and vibration was sculpted by Marshall Day.
Eva Radich talks to Christopher Day about his work and, in particular, the major project that was the Philharmonie de Paris.