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Wharfedale Opus 2 Manual

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Bass Drivers
Opus ² bass units are of two main types.
The smallest cabinets use a triple laminated cone of glass /carbon/ glass . Smaller cabinets intensify reflections
that can pass back through the cone. The special “tri-lam” construction minimises these reflections because of
its extreme rigidity - the small increase in cone mass being more than offset by the performance improvements.
The larger cabinets use larger drivers and here low cone mass is of crucial importance im maintaining impulse
response and performance.
Our latest cone designs for the large format models utilise our own
bi-carbon weave and laminating processes. Carbon fibre has
immense longitudinal strength and is used in many structures
where high strength and light weight are key requisites examples
of structures using carbon fibre include Formula 1 racing cars,
aeroplanes and spacecraft. The carbon fibre bundles are woven
and impregnated with special bonding resins that are
subsequently pressure formed and heat cured. The resulting
material is exceptionally rigid and exhibits very low levels of
internal resonance. As a consequence, energy losses in the cone
transfer mechanism are very low.
Because our bass drivers are just that, our bass cones maintain
true pistonic action over their entire designed low frequency range. The cone is terminated with a conventional
large half roll of synthetic butyl rubber with proven damping qualities.
Voice coils in high performance loudspeakers have to withstand extremes of mechanical stress and heat. The
lateral strength of Opus² voice coils is very high. We use a combination of half hard aluminium and resin
bonded glass fibre. The ability of our voice coils to resist deformation under extreme stress contributes towards
some of the lowest distortion figures ever seen in conventional drivers. The coils are covered with a dust cap of
the same material as the cone.
Large, high performance traditional ferrite magnet systems
are used throughout. All Opus²large format speakers are
fully magnetically shielded with additional bucking magnets
and steel covers on the bass driver magnets. You can
operate an Opus² speaker close to the most magnetically
sensitive TV monitor with no fears over screen interference.
Motional noise can be a problem with high output bass
systems. The high pressure injection die cast aluminium
chassis used on our bass drivers feature an 'open design'
where narrow legs maximise the open areas of the frame to
all but eliminate rear reflections. Trapped or compressed air
within the driver unit can easily move through vents in the
voice coil, through the magnet structure, through the
spider, and from the underside of the central cap both
through holes in the cone and the magnet central core.
The Opus² Drive Units
Opus²
24
Opus²Opus²
Wall Mounting AV Speakers
380 mm
190 mm 190 mm
135 mm
Opus²AvC
120mm
60mm
400mm
Opus²AvS
Opus² Tri-Sat
The AvC and AvS speakers feature a three point mounting system. Two point mounting is the
simpler option and this is the method to use unless you feel you need the security of three point
mounting. Ensure the wall is sound, free of obstructions, hidden pipes etc. and capable of
supporting the loudspeaker plus a small amount of pulling force. You will also need suitable wall
fixings and some 38mm No 8 Round Head screws.
Draw a horizontal line on the wall and mark off the
mounting centres of your loudspeaker referring to the top
dimension of the drawings.
Drill and plug two holes.
The screw header consists of a plastic spacer and a
washer. Thread a washer and a plastic spacer onto each
screw. Thread one of the screws through one eyelet of the
security strap. Let the security strap hang free.
Screw both header assemblies firmly to the wall.
Do not over tighten the screw. The spacer should rest
against the wall and not be driven into the surface.
1: Getting started
320 mm
60mm
Security strap mounting
2: Attaching the loudspeaker
Remove the plastic insert from the security mounting thread
between the keyhole slots.
Connect the connecting wire to the loudspeaker but do not
connect the cable to the amplifier. You will need to use low
profile cable -your dealer will recommend a suitable product.
Lift the loudspeaker up to the mounting position. With the
screw, attach the security strap to the loudspeaker security
mounting.
Align the keyhole slots over the screw headers and gently
pull down until the speaker is securely fastened. You may
now connect the loudspeaker to the amplifier.
On the Av speakers, ensure the connecting cable does not
foul the lower keyhole slot.
This operation may need two people. If you are in any doubt
about your ability to carry out this procedure, consult a
suitably qualified builder or domestic electrician.
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