5
5. CONNECTIONS
The connection cables which connect the amplifiers output and the speaker should be
of good quality, have sufficient conductor area and be as short as possible. The latter fact is
specially important when the distance is long and the load impedance low (4-8
Ω
). A cross-
section of at least 2.5mm
2
is recommended for distances up to 10m; 4 or 6mm
2
for longer
distances. Following formula gives the required section, assuming 4% losses:
Length in m
Cross section in mm
2
=
Loudspeaker Impedance in
Ω
Always respect polarity. All connections are Speak-on type. The pin-out is indicated in
the diagram.
6. RECOMMENDED AMPLIFIER
Following table shows the output power of the amplifier adequate to each acoustic
system:
PHILOS 10 between 200 and 400W
PHILOS 12 between 250 and 500W
PHILOS 15 between 300 and 600W
7. PRE-AMPLIFYING MIXERS
Avoid excessive gain adjustments in the equalizer or tone control sections.
8. PLACEMENT AND MOUNTING
Consider following general rules:
Place the acoustic enclosures on solid and firm surfaces. No obstacles should stand
between the enclosures and the audience. The high frequencies are very directive compared to
the low frequencies, so that any obstacle will impair their response. In case large audiences
must be addressed, a better long distance sound propagation will be achieved if the enclosures
are flown high enough.
Two stands are provided with each PHILOS cabinet in order to be installed in one of
the sides allowing the speaker cabinets to be used as stage monitors (see drawing)
9. SUSPENDING THE UNIT
The PHILOS series acoustic enclosures may be flown either using the optional SR 12
accessory or by using its 10 rigging points.
These rigging points consist of four embedded nuts on the back and six nuts on the
top and bottom of the unit.
When using SR12 fixings, an additional safety cable must be attached.
The units must never be flown from their transportation handles.
