Lab.gruppen LUCIA 240/2M - Manual (Page 8)

8. Cooling and fan operation
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LUCIA Operation Manual rev 1.0.0
8. Cooling and fan operation
Ensure that there is sufficient open space on at least two ventilating surfaces (top, bottom, front and rear) of the
amplifiers to allow for free air flow. Please refer to the Thermal Dissipation Chart (Section 15.4) when installing large
numbers of amplifiers in air conditioned spaces.
LUCIA amplifiers feature intelligent fan control as shown in the following table.
Fan mode description
Sustainable average
output power
Loudspeaker SPL extra
rel. 1 W sensitivity*
Distance at which you get
the 1 W SPL**
Fan noise at
1 m distance
Low SPL applications with proper ventilation
(meeting rooms, etc.) Up to 2x 6 W 7.8 dB 2.5 m Off
Medium SPL applications – whisper mode Up to 2x 12 W 10.8 dB 3.5 m << 32 dBA
Maximum SPL with 120/2 2x 22 W 13.4 dB 4.7 m 33 dBA
Maximum SPL with 240/2 2x 44 W 16.2 dB 6.7 m 36 dBA
Table interpretation: In a typical application, if a loudspeaker has a sensitivity of 87 dB SPL at 1 m for 1 W, then the
fan will stay silent for SPL levels up to ~95 dB (87 + 7.8) at 1 m distance from the loudspeaker; at 2.5 m from the
loudspeaker will maintain levels up to 87 dB with the fan off. If the sustained average output is higher, the fan starts
in whisper mode; however, this shouldn’t be an issue as the program SPL is so much higher, likely above 80 dB no
matter where you are in the room.
9. Operating voltage
LUCIA amplifiers have a universal power supply that operates on AC mains from 100 – 240 V at 50 or 60 Hz.
The power receptacle on the rear panel accepts the supplied IEC cord which terminates in a connector
appropriate for the country of sale.
10. Grounding
Signal ground is floating via a resistor to chassis, and therefore grounding (earthing) is automatic. For safety
reasons, never disconnect the earth (ground) pin on the AC power cord. Use balanced input connections to avoid
hum and interference when longer input cables (more than about 1 m/ 39”) are used.