Graham Audio
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Ringslade House, Ringslade Road
Highweek, Newton Abbot
A U D I O
Devon TQ12 6PT
United Kingdom
Tel:
+44 (0)1626 361 168
email: sales@grahamaudio.co.uk
www.grahamaudio.co.uk
BBC LICENSED
GRAHAM
AUDIO
PRODUCTS
...hear the difference
MONITOR LOUDSPEAKERS
H A N D C R A F T E D
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G R E A T
B R I T A I N
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The BBC LS3/5A & LS3/5
The LS3/5A is perhaps the best-known of all the BBC monitor
loudspeaker designs, which was originally evolved from the
LS3/5. With the help of Derek Hughes, Graham Audio present
both versions under The Chartwell badge.
The LS3/5 loudspeaker was originally designed by the BBC for
use in a small environment and specifically to reproduce the
sound of musical performance as accurately as possible. Only
20 original pairs of the LS3/5 were ever produced and due to a
change in available components the LS3/5 was redesigned by
the BBC as the LS3/5a.
Derek Hughes has recreated both 3/5s using bespoke drivers
from Volt loudspeakers and Seas. The crossover networks have
been developed using extensive research from the original BBC
Kingswood Warren curves and physical testing, using Southampton
University’s anechoic chamber.
In common with all our BBC loudspeakers, the cabinet uses the
classic BBC "thinwall" construction, where the panels are massloaded to ensure that resonances are moved away from the
critical mid-range region, and a layer of Rockwool is secured
by upholstery to provide air damping. The grille on the LS3/5 is
carefully designed to minimise diffraction effects and is held in
place by concealed rare-earth magnets. To support the authenticity
of the original LS3/5A, Velcro is used in place of the magnets.
System
Enclosure
LS3/5A
LS3/5
Finish
Dimensions (w/h/d)
Weight
Frequency response
2 Way, sealed enclosure
Thin wall construction,
9mm birch plywood,
removable rear panel
Real wood veneer
19cm by 30cm by 17cm
5.3kg
70Hz to 20kHz, 3dB
Nominal impedance LS3/5A
Nominal impedance LS3/5
Sensitivity
Maximum output
Bass/midrange
Tweeter
Recommended amplifier power
11 Ohms
9 Ohms
83dB SPL (2.83V, 1m)
95dB for a pair at 2m
110mm Bextrene
19mm Dome tweeter
25 to 50 watts unclipped programme
The Chartwell Sub 3
A compact passive sub-woofer, designed to be used in
conjunction with the Graham LS3/5, but also applicable to other
designs of similar sensitivity and impedance.
It is designed to be used close to a rear wall, with the main
speakers in their normal 'free space' position and has a front
facing reflex port.
It has connections on the rear for the input from the amplifier
and output to the main speakers. There is also provision for feet
or spikes to be fitted into the base of the cabinet.
The crossover uses high quality components, air core inductors
for zero saturation distortion and polypropylene capacitors.
Alignment
Dimensions
Frequency range
SUB 3
4th order Bandpass
30cm wide, 34cm deep, 30cm high
35Hz - 100Hz
(crossover point to main speakers)
Note - crossing over from the LS3/5 at 100Hz increases the
combined system power handling as if relieves the main speaker
of signal input at lower frequencies.
Sensitivity
Nominal Impedance
Connections
Recommended Amplifier power
84dB 1w 1m
8 Ohms
Gold plated terminals
30 to 80watts
The Chartwell LS6
The Chartwell LS6, designed by Derek Hughes, is comprised of
a custom built 6 inch long-throw bass drive unit mated to a
compact 17 litre cabinet which gives bass extension and power
handling that is comparable to the LS5/9.
The bespoke 19mm dome tweeter extends to beyond 20kHz.
The overall response retains the smoothness of both the LS3/5
and LS5/9.
A large rear mounted port gives effortless bass, while allowing
a minimisation of the cabinet to allow it to blend easily into
typical domestic environments.
A sophisticated crossover network blends the two units and
equalises the overall response for optimum performance in free
space. A switch on the front baffle adjusts the tweeter level to
+1dB or +2dB. This can be useful for situations where the
listening position is off axis.
In common with all our loudspeakers, the cabinet uses the
classic BBC "thinwall" construction, where the panels are massloaded to ensure that resonances are moved away from the
critical mid-range region, and a layer of Rockwool is held in
place by fabric to provide air damping. The grille is carefully
designed to minimise diffraction effects and is held in place by
concealed rare-earth magnets.
LS6
System
Enclosure
Finish
Dimensions (w/h/d)
Weight
Frequency response
2 Way, reflex loading
Thin wall damped construction
Real wood veneer
24cm by 37cm by 26cm
9.5kg
45Hz to 20kHz, 2dB
Nominal impedance
Sensitivity
Maximum output
Bass/midrange
Tweeter
Recommended amplifier power
8 Ohms
87dB SPL (2.83V, 1m)
Over 100dB for a pair at 2m
165mm Polypropylene
19mm Dome tweeter
50 to 150 watts unclipped programme
The BBC LS5/8
The LS5/8 is the BBC's flagship design, and was developed
because of the need for higher sound pressure levels and greater
transparency and consistency. This was the first BBC loudspeaker
to use a polypropylene diaphragm which, being lighter than
Bextrene, offered greater efficiency and lower colouration.
A carefully researched cone profile enabled the unit to work
successfully well into the midrange.
After many months of intensive development, the Graham Audio
LS5/8 refined the concept further. Designed in conjunction with
Derek Hughes and Volt Loudspeakers, and manufactured under
license in the UK, it features a unique 12 inch bass/mid unit
that is married to the same 34mm Audax tweeter used
in the LS5/9.
The design retains the same midrange clarity and balance of
the LS5/9, but offers an extended bass response and greater
authority at higher level in larger rooms. The continuity of sound
quality between the two designs means that engineers can move
between the two different loudspeakers with complete confidence
during the recording and mastering process.
The LS5/8 was originally conceived as an active design, but
Derek Hughes has designed a passive crossover that greatly
improves on the resolution and imaging of the original design
while still conforming to the demanding BBC specification.
LS5/8
BBC LICENSED
MONITOR LOUDSPEAKER
System
Enclosure
Finish
Dimensions
Weight
Frequency response
2 Way, reflex loading
Thin wall construction, birch plywood
Real wood veneer
76cm by 46cm by 40cm
34kg
40Hz to 16kHz, 3dB
Nominal impedance
Sensitivity
Maximum output
Bass/midrange
Tweeter
Recommended amplifier power
8 Ohms
89dB SPL (2.83V, 1m)
Over 110dB for a pair at 2m
300mm Diaphnatone polypropylene
Son Audax HD13D34H
50 to 250 watts unclipped programme
The BBC LS5/9
Designed for use by the BBC in smaller studios and control
rooms, the LS5/9 is a close sonic match for the larger LS5/8.
Equally at home in a domestic setting, the open and expansive
mid-range reveals previously unheard details from even the
most familiar recordings.
With Derek Hughes at the drawing board, the original BBC design
has been recreated. A new bass/midrange driver has been
developed in conjunction with Volt Loudspeakers. It uses a
substantial die-cast aluminium frame and a massive motor
assembly, allied to a diaphragm formed from a selected grade
of polypropylene and matched to a high quality rubber surround.
Each bass driver is hand-assembled and tested by Volt.
The tweeter is a selected version of the Audax 34mm soft dome,
which is protected by a strong metal grille. A sophisticated
crossover network blends the units together and equalises the
overall response for optimum performance in free space.
The cabinet uses classic BBC "thinwall" construction, and is
manufactured in the UK from high quality 9mm birch plywood.
All joints in the cabinet are reinforced with hardwood batons to
ensure long life and total air sealing. The panels are mass-loaded
to ensure that resonances are moved away from the critical
mid-range region, and a layer of Rockwool held in place by fabric
provides air damping. The grille, machined from a single piece
of 9mm birch plywood is held in place by concealed rare-earth
magnets.
LS5/9
BBC LICENSED
MONITOR LOUDSPEAKER
System
Enclosure
Finish
Dimensions (w/h/d)
Weight
Frequency response
2 Way, reflex loading
Thin wall construction, birch plywood
Real wood veneer
28cm by 46cm by 27.5cm
14kg
50Hz to 16kHz, 3dB
Nominal impedance
Sensitivity
Maximum output
Bass/midrange
Tweeter
Recommended amplifier power
8 Ohms
87dB SPL (2.83V, 1m)
Over 100dB for a pair at 2m
200mm Diaphnatone polypropylene
Son Audax HD13D34H
50 to 200 watts unclipped programme
Beautiful hand-matched, real wood veneers.
A choice of four classic finishes: Cherry, Oak, Rosewood or Ebony
H A N D C R A F T E D
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G R E A T
B R I T A I N
VOTU
The VOTU brings new levels of refinement and authority
to the discerning home enthusiast and professional user alike.
Building on the research and development that delivered the
bespoke SYSTEM 3D to the Royal Opera House in
Covent Garden, London
The VOTU uses two 10" drivers which cover the bass frequencies
and extend up to 800Hz, where a refined 3" soft dome driver
takes over. This covers the critical midrange region until 4kHz,
atwhich point the high power 34mm soft dome tweeter comes
into play. The midrange dome is mounted above the tweeter to
improve the integration between dome and tweeter.
The crossover network uses high grade capacitors and air core
inductors that do not saturate at high power levels. These premium
components ensure that harmonic distortion is kept at extremely
low levels for maximum preservation of low-level detail.
As with all Graham Audio loudspeakers, the cabinet follows BBC
"thinwall" practice, where careful damping of the relatively thin
panels is designed to move all colouration away from the
midrange area where the ear can be most sensitive to low-level
resonances.
This flagship system maybe used with amplifiers up to 1000
watts per channel, and is capable of a breathtaking dynamic
performance.
V
TU
THE VOICE OF THE UNIVERSE
System
Enclosure
Finish
Dimensions (w/h/d)
Weight
Frequency response
Nominal impedance
3 Way, reflex-loading
18mm birch plywood
High-gloss painted and lacquer finish
37cm by 116cm by 43cm
65kg
38Hz to 18kHz, 3dB
8 Ohms
Sensitivity
Bass
Midrange
Tweeter
Crossover frequencies
Recommended amplifier power
88dB SPL (2.83V, 1m)
Two 250mm bass units
75mm Dome
34mm Dome
800Hz, 4kHz
250 to 1000 watts unclipped programme