Thank you for purchasing this loudspeaker
system from Graham Audio.
These loudspeakers have been carefully
crafted using the finest materials according
to strict BBC specifications and will provide
many years of listening enjoyment.
For the best results, please spend a few
minutes reading these instructions before
setting up your new loudspeakers.
LS5/9 Overview
The LS5/9 is a high quality monitor loudspeaker originally developed by the BBC for studio use.
The Graham Audio LS5/9 has been developed using modern components and production techniques to
provide a result that is an extremely close match to the original BBC R&D prototype.
Drive units
The 200mm bass/midrange drive unit is the result of collaboration between Graham Audio and Volt
and matches the original BBC LS2/14 as closely as possible in behaviour while avoiding the
longevity problems of the original unit. The 34mm tweeter is the latest version of the unit originally
used by the BBC. Each example is measured and graded accordingly. Like the originals, it is fitted
with a protective metal grille.
Enclosure
The cabinet is built using high quality 9mm birch plywood panels, which are lap-jointed and
damped using oil-free pads. Air damping is facilitated by 30mm slabs of high density Rockwool,
retained with cloth. For maximum serviceability, the baffle is readily removable for access to the
drive units and crossover. All fixings are stainless steel for maximum corrosion resistance. The cloth
grille is retained with concealed rare-earth magnets. The whole cabinet, including the baffle, is
covered using hand-matched sheets of real wood veneer.
Crossover
The result of extensive development, the crossover is responsible for dividing the audio spectrum
between the two drive units, and for equalising the response to match the original BBC R&D
specification. High quality parts are used, including premium grade polypropylene capacitors. A
tapped auto-transformer provides the bulk of the level equalisation between the woofer and the
tweeter. Fine-tuning is provided and each assembled loudspeaker is measured and adjusted
individually before the final check and despatch.
MONITOR LOUDSPEAKERS
BBC LICENSED
A U D I O
ENGLISH HIGH FIDELITY
OWNERS MANUAL
