The L Classic 
Technology

Kevlar Cone Driver
L Classic's long-throw Kevlar driver is manufactured using our proprietary 
bi-directional Keviar weave, made from a self-damping resin-impregnated 
flore form of the material that is then lattice woven to create the appropriate 
stiffness, strength and weight, and later formed into a cone and mounted 
on a butyl rubber surround.

Driver Integration
The L Classic tweeter utilizes a pracialon-engineered waveguide to integrate 
the midrange and trable in a totally coherent way. The motor system of the 
bass-midrange unit has been critically aligned for improved linear motion 
and low distortion. Acoustically the drive units are combined by an advanced 
phase-linear crossover utilizing low distortion Inductors and high clarity 
polypropylene capacitors in the signal path Phase coherency is particularly 
important to ensure the pass Integrates perfectly with the treble, and of 
course to create a truly holographic stereo Image - the hallmark of the classic 
Quad sound.

Bass-Midrange Driver Technology
A high efficiency, double hand-wound voice coil tracks the signal, with the 
high-gauss magnet assembly providing momentum for movement. This 
dual 25mm voice coll of the bass driver is wound on an aluminum alloy 
carrier or bobbin'. This dissipates heat from the central coll region to 
maintain peak performance and optimum excursion of the long-throw 
driver. The colle are vented to reduce the effect of any pressure build up 
in the central cone region. A strong die cast aluminum alloy chassis assembly 
is an essential part of the design, keeping everything taut and under control, 
even when encountering large tranalents and extremes of power.

Bi-Wiring
L Classic speakers have two pairs of binding posts for pi-wiring. This involves 
the use of two pairs of separate cables between the amplifier and the 
loudspeakers. One connects to the treble unit while the other to the 
bass-midrange driver. Using separate cables for treble and bass units 
reduces intermodulation effects while improving headroom and clarity.

Multi-Layer Cabinet Construction
The L Classic range features a multi-layer cabinet construction coupled with 
additional internal bracing to significantly reduce cabinet coloration and 
resonance. Special Internal long fibre damping is utilized to randomize 
internal reflections and thus prevent standing waves from forming. 
The result is that you hear the output of the drive units without interference 
from the cabinet structure or reflected sound from the internal volume.

Real Wood Veneers and Plano Gloss Finish
L Classic loudspeakers are available in real wood veneer and piano gloss 
finish options. The real wood veneers are specially chosen and matched for 
each pair of speakers and then polished to reveal the deep grain pattem and 
depth of colour.
Lustrous piano gloss la applied to each speaker by hand over a period of 
seven days, each of which involves applying a coat of lacquer which must 
then dry at an ambient temperature before being cut and polished The final 
coat is polished to a high gloss finish to produce one of the finest finishes 
seen on any loudspeaker in its class.

 A Return to 
Tradition

The Quad 11L Classic follows in the tradition of 
small, monitor class loudspeakers set by the BBC 
LS3/5a. This precedent set new standards for 
accuracy and midband definition when it was first 
introduced and is still held in high regard by 
audiophiles worldwide today.

A small monltor loudspeaker has distinct advantages 
both for near field monitoring and for music reproduction 
at home The use of relatively smal bass/midrange unit provides 
the possibility of excellent integration with the treble unit, 
delivering an accurate power response both on the forward axis 
and in the room.

As a result this mini-monitor design approach yields an expansive 
stereo soundstage that belies the size of the speaker itself, and the 
coherent midband gives fallka reproduction of vocals and acoustic 
instruments.

Drive unit integration

Quad 11L Classic has been fitted 
with an advanced motor system, 
coupled to the woven Kevlar base 
unit cone, which results in much 
improved linearity and substantial 
8 reduction in midband and bass 
distortion levels. As a result the 
speakers will play loud - ÈeÈd longer 
is the mini-monitor only suitable 
for small rooms. But of greater 
interest is the new profile for the 
treble dome. This takes the form of a shallow horn 
waveguide that controls the dispersion of the dome to 
mimic that of the midrange cone through the crossover 
region.
As a result the crossover becomes almost inaudible in 
the overlap between the driver units, yielding a coherent, 
detailed and remarkably lifelike midrange performance 
in a almilar way to the coherence heard from electrostatic 
panels.

A flat frequency response le only one clue to the monitor
-like accuracy. On both horizontal and vertical axes the 
response is maintained within +/-3dB giving a clue to the 
excellent power response heard in-room Reflections from 
nearby walls, floor and celling, which normally skew the 
acoustic response heard by the listener and which increase 
coloration, only add to the overall acoustic power and do 
not distort the perception of the forward response.

Cabinet construction

The BBC LS3/5 usod a novel approach to cabinet 
construction to reduce the audible effects of panel 
resonance. Likewise the Quad 1.1L Classic niso 
utilizes an intriguing method of reducing both 
panel resonance and the transmission of sound 
from inside the enclosure.

A combination of two differing wood materials is 
used for the carcass of the cabinet in order to 
reduce the audibility of panel resonance and to 
make the cabinet more opaque to sound. High 
density chipboard and fibreboard are laminated 
together in a structure that braaics up the resonant 
mocas into multiple mini-modal frequency bands 
that lack the strong sonic algnature experienced 
by more coherent panels auch co MDF
Graph 1. "Waterfall Graph of Resonance of an MDF 
Cabinet Side Panel Note the strong modes at 360Hz 
and the high frequency transmission through the 
panel.

Interior sound from the bees drive unit le 
partially absorbed by specially solooted 
long-hair acoustic absorbent applied to the 
cabinet walls. In addition the random particle 
structure of the chipboard provides a long 
and diffused path for internal sound that ties 
to escape from the cabinet. The net result is 
that cabinet coloration is reduced in all its 
forme leaving the drive unite as the primary 
sound reproducers

Graph 2. Waterfall Graph of Hosonance of the 
Quad L Classic Side Panel. The etrong low 
frequency mcdee have disappeared and higher 
frequency transmission is significantly reduced.

QUAD-A New Classic

In the best Quad tradition the L Classic series follows the dictum 
'The Closest Approach To The Original Sound. Majoring on timbral 
accuracy exceptional detall retrieval and low coloration, the L 
Classic is everything a monitor-class loudspeaker is meant to 
be, and more.

The more is the through enjoyment of music that the L Classic 
delivers to the listener. It is not critical of musical styles or 
recordings but will respond enthusiastically to high quality 
input and reward the listener with a rendition that lends 
insight into both the recording and the musical 
performance.

We are certain that the Quad L Classic series will join the 
small number of monitor loudspeakers that have become 
classics in their own right amongst hi-fi enthusiasts the 
world over.