LANSCHE AUDIO
OPERATING INSTRUCTIONS No.7
Page 12 / 18
3. CORONA Plasma Tweeters
3.1. Information about CORONA Plasma Tweeters
a.
The CORONA plasma tweeter emits a bright light (plasma ball) during the start up operation.
As with any bright light source avoid looking directly at it from a short distance (less than 30 cm).
b.
Avoid allowing any objects to enter into the CORONA‟s plasma ball chamber (except for cleaning
purpose, see section 3.5 of this manual). This could damage the chamber.
When in operation, there is no danger of a hazardous electric shock if a metallic object should
accidentally find its way into the chamber (inserted by a child, for example).
c.
During operation, the temperature at the electrode tip is about 800
°
C (1,472
°
F). Do not allow any
kind of material (especially flammable materials) to enter the chamber. Even after switching off,
the temperature remains high for at least 30 minutes.
d.
During operation, the horn of the CORONA can heat up to 50
°
C (122
°
F). Depending on the
ambient temperature this can be higher.
e.
CORONA plasma tweeters are highly sensitive electronic devices. Please protect them from
mechanical impacts or other mechanical influences.
f.
Particularly during the initial start up phase of operation, it is possible the CORONA will produce
some noise. This is due to dust and other stray particles which found their way into its chamber and
are being removed.
g.
Never allow air to be blown directly and continuously in to the CORONA‟s plasma ball chamber.
This will produce audible noise and possibly ozone.
h.
Due to the nature of the vacuum tube in the CORONA it is possible it fails to self-start after being
powered off for a few minutes. This phenomenon is due to the „memory effect‟ of the vacuum
tube. Please wait a while and try again.
i.
The self-starting of the CORONA is dependent on the cleanliness of the electrode. If the electrode
has not been cleaned recently then a layer of dust and foreign particles will have formed over
it. Cleaning will be necessary, see section 3.5 in this manual.
j.
The colour and brightness of the CORONA‟s plasma ball is dependent on dust and foreign deposits
on the electrode, the operating temperature, the air humidity and the electrode‟s running hours.
When the CORONA is in the start up phase its plasma ball can become very bright, this is done
deliberately to improve starting and to remove any foreign deposits within its chamber.
Periodic cleaning will give the CORONA plasma ball a diffused 'blue-pink-white' colour.
However, small differences in colour and brightness are normal. If the plasma ball still remains very
bright after the start up phase you should clean the electrode as described in section 3.5 of this
manual.
k.
After the starting process has ended the CORONA switches to normal operation (its plasma ball
brightness and size is reduced). Please note, it can take a few minutes for the plasma ball to form a
complete circle.
CAUTION:
Do not move the loudspeaker until the CORONA plasma tweeter has been
powered off for at least 15 minutes and cooled down. Some parts when
hot are sensitive to shocks.