Davies joins the company with immediate effect, replacing Richard Liddell who intends to spend more time on his other business interests. Liddell, meanwhile, remains with Sound as its independent non-executive director.
The new chairman already has an association with the company - he is presently a 1.67% stakeholder in the company and he has had two prior stints as chairman (2014-16, 2005-10).
"I would like to thank Richard for his contribution and counsel during his tenure as chairman, and am delighted he will remain on the board as a non-executive director,” said James Parsons, Sound chief executive.
“I look forward to working with Simon again and know he will bring a huge amount to the Board at an important time for the company."