Original speaker parts can be obtained in the UK by contacting Multicare Electronics ( +441132791255 , info@multicare.org.uk ). I initially called the Harman support line (Harman is the umbrella company of JBL), who redirected me to Multicare who are their official repair/parts company in the UK. Multicare sent me a replacement speaker unit for about £20 (ex shipping), which I have now fitted and is working perfectly. Good experience and thanks for this iFixit guide!