Other Considerations - Ecler Philo S 12A Bedienungsanleitung

- Micro inputs
MICRO input is prepared for a nominal input level of -40dBV (10mV).
Microphones used must be dynamic, with low impedance (from 200 to 600Ω) and
monophonic. Usually, this kind of microphones are electronically balanced, but given the less
common case of working with a NON- electronically balanced microphone, please shortcircuit pins 1
and 3.
- Audio output connection
It is also electronically balanced and uses a male XLR3 connector. Its nominal level is
-10dBV (316mV). This output can be used for chaining the Philos unit to another self-amplified
enclosure or to a conventional external amplifier. It can also be used as recording output. It must be
beard in mind that the output is affected by volume controls. This implies that high signal levels can
exist at the output, which could lead to overload next amplifying stages when chaining different self-
amplified enclosures. Please be very careful with signal levels when using this output, and as a
general rule avoid excessive gain in tone controls.
- Indicators
"POWER ON" blue led indicates that power amplifiers are correctly supplied.
Each input has a green led "SIGNAL" indicator, that lights when there is a -40dBV signal
level at the inputs. These are very useful for checking that the input mixer gets correctly the audio
signal from external sound sources.
Finally, "CLIP" indicator warns about power amplifiers overload due to signal excess. In
order to avoid distortion and speakers damage, it is very important that this indicator does not act.
- Tone control
The Philos 12A includes an effective three-band Baxandall tone control system, with an
actuation margin from -20 to +10dB at each band. Its cut frequencies are 250Hz and 5kHz. The
Philos 12A unit does not need excessive equalisations to sound properly. In order to avoid risks, it is
recommended to not exceed a ¾ level.

7. OTHER CONSIDERATIONS

- Ground loops
It is recommended that all the different sound sources connected to the Philos 12A unit,
as well as any device connected to its output, do not have their ground connections shortcircuited
(i.e. that they do not have two or more different ground paths). If that occurs hum could appear,
interfering in sound quality. If cable shieldings are connected to the chassis, they should be never
interconnected, in order to avoid ground loops.
- Audio connections
As a general rule of thumb, make the signal connections as short as possible and use the
best connectors and cable available. Cables and connectors are frequently held cheap, forgetting
that a bad connection can result in a poor sound quality.
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