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Underneath the classically British exterior beats an
audiophile heart. The long-throw KEVLAR driver is
manufactured from a self-damping resin impregnated
fibre form of the material. This is then lattice woven to
create the appropriate stiffness, strength and weight
properties. The material is formed into a cone and
mounted on a butyl rubber surround. A high efficiency,
double hand-wound voice coil tracks the signal, with the
high-gauss magnet assembly providing an impetus for
movement. A strong, die-cast aluminium alloy chassis
assembly is an essential part of the design, keeping
everything taut and under control, even with large
transients and extremes of power. A profiled phase plug
provides additional cone axial rigidity and also improves
off-axis performance.
The dual 25mm voice coil is wound on an aluminium
alloy carrier or ‘bobbin’. This ‘wicks’ heat away from the
central coil region to maintain peak performance and
the optimum excursion of the long-throw driver. The
coils are vented to reduce the effect of any pressure
build-up in the central cone region.
Many years of experience have manifested themselves in
the high-frequency driver. A compact yet powerful
neodymium magnet keeps the tightest control on the
diaphragm. Phase coherency is particularly important to
ensure the bass integrates perfectly with the treble, and
of course, to create a truly holographic stereo image –
the hallmark of a classic Quad sound. This tweeter is so
controlled; it measures typically less than 1% distortion
from 103dB (equivalent to normally loud playback)
output at a distance of 1 metre.
The tweeter fascia plate is engineered for a smooth
frequency response and excellent dispersion. This is
further aided from the flush mountings of this plate and
the bass/mid unit into the cabinet front baffle. Both drive
units are closely coupled to provide good integration.
The Technology
L Series