INTRODUCTION
Thank you for buying the Apex LETO. The Apex LETO is part of the Apex SL-series: Sound Level
Limiters and controllers for pubs, discos, theatres, ...
The Apex LETO large remote display is intended to increase the public’s and performer’s awareness
of sound levels. The LETO must be connected to the Apex HERA and will constantly display the
instantaneous or average sound level over a selectable period of time. The LETO is controlled via the
Hera front panel. Housed in standard 19-inch enclosure, installing the LETO in a rack or into furniture
is fairly easy. To make sure you make the best use of the LETO, we invite you to carefully read this
manual, especially the wiring instructions.
UNPACKING AND SAFETY
Proper power cord
Use only the power cord and connector specied for the
product and your operating locale. Use only a cord that
is in good condition. Protect the power cord from being
walked on or pinched, particularly at the plug, conve-
nience receptacle, and the point where the cord exits from
the apparatus.
Operating location
Do not operate this equipment under any of the following
conditions: explosive atmospheres, in wet locations, in
inclement weather, improper or unknown AC mains vol-
tage, or if improperly fused. Do not install near any heat
source such as radiators, heat registers, stoves, or other
apparatus (including ampliers) that produce heat. Unplug
this apparatus during lightning storms or when unused for
long periods of time.
Stay out of the box
To avoid personal injury (or worse), do not remove the
product covers or panels.
Do not operate the product without the covers and panels
properly installed. Only use accessories specied by the
manufacturer. Clean only with a damp cloth.
Follow all warnings and instructions.
Install in accordance with the manufacturer’s instructions.
Power Source
This product is intended to operate at a low DC voltage of
12 V DC. An external mains adapter is provided with this
product. Carefully check that the adapter can accommo-
date the mains voltage and frequency available.
Grounding
The chassis of this product is grounded through the
power cord. To avoid electric shock, plug the power cord
into a properly wired receptacle before making any con-
nections to the product.
A protective ground connection, by way of the grounding
conductor in the power cord, is essential for safe opera-
tion. Do not defeat the safety purpose of the
grounding plug. The grounding plug has two blades and a
third grounding prong. The third prong is provided for your
safety. When the provided plug does not t your outlet,
consult an electrician for replacement of the obsolete
outlet.
Danger from loss of ground
If the protective ground connection is lost, all accessible
conductive parts, including knobs and controls that may
appear to be insulated, can render an electric shock.
