Fine tuning
Before fine tuning the installation, double check
the polarity and security of the connections.
If the hand-tightened nut that holds the
Nautilus to the plinth is not done up sufficiently
tightly, it can occasionally work loose. This may
create a difficult-to-locate rattle or buzz. The
accessory pack includes a rubber washer and a
steel washer that should be employed between
the plinth and nut to eliminate this problem. The
rubber washer should rest against the plinth.
If it is not possible to position the crate near
the plinth when unpacking, the pieces of foam
covering Nautilus in the crate can be used to
support the loudspeaker close to the plinth
within reach of the loudspeaker harness.
If you need to alter the tilt of the Nautilus,
French chalk is supplied in the accessory pack
to ease movement between the speaker and
its plinth.
If the level of bass is uneven with frequency,
this is usually due to strong excitation of
resonance modes in the room. Even small
changes in the position of the speakers within
the listening room can have a profound effect
After care
The GRP cabinets normally only require dusting.
If you wish to use an aerosol cleaner, spray onto
the cleaning cloth, not directly onto the cabinet.
If the surface of the speaker suffers any minor
scratches, they can be polished out with fine
T-Cut or finishing compound such as “Finesse It”
by 3M.
When making or breaking connections,
ensure all power is switched off otherwise
damage may result.
Avoid touching the drive units, especially
the domes, as damage may result.
Specification
Technical features
Description
Drive units
Frequency range
Frequency response
Dispersion
Crossover frequency
Power amplifier
requirements
Dimensions
Net weight
Standard finishes
Nautilus tube-loading
active crossover
4-way tube-loaded loudspeaker system
1x ø300mm (12 in) aluminium cone bass
1x ø100mm (4 in) aluminium/polymer sandwich cone lower midrange
1x ø50mm (2 in) aluminium dome upper midrange
1x ø25mm (1 in) aluminium dome high-frequency
-6dB at 10Hz and 25kHz
25Hz - 20kHz ± 1dB on reference axis
Within 2dB of response on reference axis
Horizontal: over 60° arc
Vertical: over 10° arc
220Hz, 880kHz, 3.5kHz
4 channels per speaker, rated 100W - 300W continuous into
8V on unclipped programme (each channel to have identical
gain and phase)
Height: 1210mm (47.6 in)
Width: 430mm (16.9 in)
Depth: 1105mm (43.5 in)
Speaker: 44.5kg (98 lb)
Plinth: 42kg (92 lb)
Total: 86.5kg (190lb)
Midnight Blue, Black, Silver
on the perceived sound quality by altering
the excitation of these modes. Try mounting
the speakers along a different wall. Even
moving large pieces of furniture about can
have an effect.
If the general level of bass is too high, try
moving the speakers further away from the
walls. Conversely, if you need more bass, move
the speakers closer to the walls. Space behind
the speakers also improves the impression of
perspective on well recorded material.
If the sound is too harsh, increase the amount
of soft furnishing in the room. For example, use
heavier curtains. Conversely reduce the amount
of soft furnishing if the sound is dull and lifeless.
Test for flutter echoes by clapping your hands
and listening for rapid repetitions. These can
smear the sound, but may be reduced by
irregular shaped surfaces such as bookshelves
and large pieces of furniture.
As Nautilus is designed in such a way that
the units are de-coupled from the enclosure
and the base weighs a substantial 42kg.
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