Martin Professional Outdoor ViroSphere, Manual

Page: 6 / 12

6
Warning! When installed in environments where the Outdoor ViroSphere
will be exposed to rain, the recessed space containing the cable
connector must be oriented so that water does not collect in it.
Amplification
W h e n b e i n g u s e d i n p u b l i c a d d r e s s , d i s t r i b u t e d pa g i n g , a n d i n
foreground/background music applications, we recommend the use of a
constant-voltage (CV) distribution system. A CV system relies on an
amplifier whose output voltage is constant over a very wide range of load
impedances (down to a practical minimum, usually 4 ohms). Where the
program bandwidth is limited, and SPL demands are low, CV systems offer
a cost-effective solution to the challenge of sound distribution.
Connections
Always use high quality speaker cables approved for outdoor use. Poor
cables will reduce the sound quality and the reliability of the amplifier and
speakers.
The Outdoor ViroSphere is supplied with a 6 m (20 ft) cable. When the
speaker is used in an outdoor configuration, this cable must be connected to
an appropriate IP-rated junction box, that is in turn connected to the
amplification system. Ensure that connections are weather-proofed and that