KLH Ultimate One

摘要

Mention beryllium and digit counters begin to whorl in the imagination. Unquestionably the very best metal from which to construct a headphone or loudspeaker diaphragm - because the speed of sound through it is over twice that of aluminium, magnesium or titanium - its use has historically been constrained for two reasons. First, beryllium is dangerous stuff to use in a manufacturing environment; and second, it's expensive. For proof of the latter look around you at, say, TAD's loudspeakers or Focal's Utopia [HFN Feb '17] and Stellia [HFN May '19] headphones. The Focals, both equipped with drivers having beryllium diaphragms, cost about £3500 and £2800 respectively.