Krix MX20, Руководство по установке

Страница: 14 / 16

14
EQUALISATION
Due to the use of Krix constant directivity
horns and waveguides, the MX systems have
an advantage over conventional speakers as
they deliver more direct sound to the listener
and less sound reflecting off the walls and
ceiling. The baffle wall design of the MX
system also launches the sound from a flat
plane, ensuring the frequency response is
unhampered by acoustic diffraction effects
and front wall reflections associated with
conventional home theatre installations. The
MX systems are therefore less influenced by
the acoustics of the room.
Before attempting to perform equalisation
of your processor or receiver, please ensure
that adequate attention has been given to the
acoustics of the room and acoustic treatment
options have been explored. Equalisation can
only partially compensate for a room with
poor acoustics.
As an initial step, Krix suggests configuring
your AV receiver/processor with manual
equalisation settings to achieve a simple and
faithful re-production of the source material.
Automated equalisation procedures may
also be employed, but the results will
vary depending on the algorithms and
microphone placement techniques.
Speaker Distances and dB Levels
Automated speaker configuration systems
are very good at setting the speaker distances
(delays) and setting dB levels for each
speaker in a system. If using this approach, it
is advised to check the settings manually for
any anomalies. In some instances, increasing
the centre channel level by 1-3dB is preferred
for increased dialogue intelligibility. Adjusting
the subwoofer level manually is often required
to suit the listener preferences. Boosting or
cutting the subwoofer level by up to 9dB is
not uncommon to achieve the desired result.
Speaker Size
Automated setup procedures may also be
used to set the size of each speaker, but
the results should be checked and adjusted
where necessary.
Although the MX-20 and MX-30 main
speakers are physically ‘large’, setting them to
small allows the lower bass frequencies to be
sent to the subwoofers that are better suited
to reproducing the lowest frequency content.
MX-20 Main – recommended to set speakers
to small with 60Hz crossover
MX-30 Main – recommended to set speakers
to small with 40Hz crossover
Subwoofer power amplifier
configuration
Limiter:
Where available, the use of a power amplifier’s
soft limiter function is strongly recommended
on MX subwoofers.
If the power amplifier driving the subwoofers
is inadvertently overdriven on program peaks,
the use of an effective soft limiter will protect
the loudspeaker driver against clipping
damage and will also reduce the incidence of
adverse distortion when the amplifier is faced
with signals in excess of its peak rating.
High pass filter
The MX subwoofer can benefit from the use
of an appropriately selected high pass filter.
By filtering out the subsonic frequencies, the
overall system power handling is improved.
MX20 – 25Hz high pass 12dB /Oct
MX30 - 20Hz high pass 12dB /Oct
Dynamic Compression / Night Listening
The MX systems are capable of reproducing
the full dynamic range of a movie, therefore it
is recommended that dynamic compression
or night listening mode settings are disabled
in both the AV receiver/processor and blu-ray
player configuration menus. This will allow
the reproduction of the movie soundtrack’s
full dynamic range, as the director intended.
Dynamic Equalisation / Loudness Controls
‘Loudness’ type settings adjust the
equalisation of the system by boosting the
bass and treble due to the human ears lack
of acuity over these frequency ranges at low
listening levels. Unless you intend to do a
lot of listening at low volume levels it is best
to disable this setting to maintain a faithful
reproduction of the source material.
Room Equalisation
The native response of the MX system
is designed to be consistent across the
frequency range, however some room
equalisation is often beneficial in tuning the
response of the system to the environment.
Room equalisation involves dealing with
the somewhat complicated subject of room
acoustics and to clarify this often-confusing
subject it may help to consider the different
characteristics of the room environment and
system equalisation separately.
Room size and ‘liveness’ /
reverberation time
The reverberation time of the room is the
time taken for reflected sound energy in the
room to reduce to a low level. Highly treated
rooms have lots of absorbing surfaces
that are particularly effective at higher
frequencies. This type of room can benefit
from a lift in the treble to avoid the system
sounding too dull or ‘soft’. Alternatively, larger
rooms may be perceived as sounding too
bright when combined with speakers that
have a flat frequency response and so a
gentle treble roll-off may be preferable. The
MX systems have a slight treble roll-off and
therefore will tend to sound most balanced
in larger, moderately treated rooms. In smaller
and/or well treated rooms, some treble lift
is recommended. Also, some treble lift may
be required to compensate for treble loss
through perforated acoustic screens. Woven
screens are acoustically superior and suffer
from very little treble loss.