KEF R3 bookshelf speaker. Performance on a standmount is redefined by R3. It makes sense because it uses the same drivers as the top-of-the-line R11. The 165mm (6.5 in.) bass driver, a real three-way speaker, pushes bass performance to new heights. The Uni-Q array, which is made up of a 25mm (1 in.) aluminum dome tweeter and a 125mm (5 in.) midrange driver, defies expectations for the smallest main speaker in the lineup. However, KEF Speakers engineers have lessened the influence of these required gaps by opening a chamber beneath the drivers and adding resonance-absorbing dampening material for a more precise, purer treble. Tiny resonances are caused by air moving through the tiny gaps between Uni-individual Q's parts.