Sonus Faber IL CREMONESE Ex3eme Mode D'emploi page 20

3.4.8 RECOMMENDATIONS FOR CHOOSING THE AUDIO AMPLIFIER
The output power required by amplifier in average conditions depends on the features of the loudspeaker
system (nominal impedance and sensitivity) and listening conditions (average acoustic level and listening
point). The following table, as an example, shows the case of a loudspeaker with a 4-ohm nominal
impedance and a sensitivity of 92 dB SPL.
Listening
distance
2 m
2.5 m
3 m
3.5 m
* for an average volume level at a listening distance equal to 82 dBSPL, music signal with 20 dB crest
factor
Sound programs with higher crest factors require power amplifiers with a higher headroom of output
voltage, while the average power of the audio signal normally remains fairly low. The choice of amplifiers
should therefore be made taking into account not so much the value of the average power supplied for low
listening levels but, above all, the management of those very short moments in which the musical signal
reaches extraordinarily high peaks.
4 MAINTENANCE AND CLEANING
The loudspeakers do not require any particular maintenance operations, just general periodic cleaning.
In order to preserve the loudspeakers' finish, cover them with the supplied fabric dust-protection sheet,
EN IT
especially if the loudspeakers are not expected to be used for an extended period of time.
Risk of damage to the loudspeaker's cabinet!
Do not use cleaning products, furniture wax, liquid detergents, or alcohol.
Do not use rough cloths.
Do not use products like waxes or detergents to clean the wood parts, as these could stain or damage
the wood or the loudspeakers themselves. It is recommended to use a soft cloth (e.g. microfiber, like that
supplied), and moisten it slightly with the liquid supplied in the cleaning kit, if necessary. Wood is a natural
living material that can be affected by the environmental conditions. We recommend positioning the
loudspeakers away from heat sources or windows, above all during the summer months. Avoid exposing
the loudspeakers to direct sunlight.
It is recommended to use a soft brush to eliminate any dust that may have accumulated on the cabinet,
the front panels, and the loudspeakers themselves, taking care not to damage the loudspeakers' delicate
membranes.
It is recommended to use a cloth dampened in water or common liquid neutral detergents with low alkaline
content to clean the marble parts of the base of the speaker and the base of the stand (where present).
It is recommended to use the supplied cloth and liquid to clean the metal and glass surfaces (where present).
Do not use aggressive strong chemical products such as acetone, trichloroethylene, acids, abrasive agents,
strong de-greasers, alcohol, lemon or wine.
Other specific suggestions and instructions are provided in Section 6 (Illustrations).
These measures will help you to keep your loudspeakers' working perfectly for years to come. Time will
help improve the sound by breaking in the speakers' moving parts (membranes and suspensions), and
the acoustic chamber will become accustomed to music being played the more it is used - much like what
happens with acoustic string instruments!
Required amplifier required output power (min.
P per channel*)
avg
40 W
63 W
90 W
125 W
Corresponding audio signal power
(per channel) *
0.8 W
1.3 W
1.8 W
2.3 W
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