bass unit surrounds?
Harbeth does not use foam surrounds on its drive units. Whilst it is true that foam surround are much lighter than rubber, they deteriorate rapidly in tropical conditions and eventually the drive unit fails. The acoustic performance of the surround is critical to the overall sound, surprisingly so at the upper end of the bass/midrange driver’s response. The rubber surrounds used on the Harbeth-made 8″ bass/midrange driver (woofer) are made from an optimised chemical combination engineered and manufactured in the UK by specialist rubber chemists.
