audiophony Wi SERIES Manuel de l'utilisateur - Page 10
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7 - Protection systems
Wi series amplifiers feature multiple protection
systems born from Audiophony's long experience
in professional sound solutions, to ensure the
best possible lifespan and protect the internal
components of your device and connected sources.
- SoftStart system
The SoftSart protection system gradually powers up
your unit upon activation in order to preserve your
speakers.
- Thermal protection
In case of overheating, the thermal protection will
open output relays. The Protect LED will light up
during this process. If the power transformer is also
overheating, its temperature sensor will disconnect
all power outputs, the Protect and Clip LEDs will
light up while the "On" LED will turn off. The cooling
fans will operate at lower speed.
Your device will be fully operational again once the
standard temperature has been reached.
Page 10
Important note about the Bridge mode
1 - In Bridge mode, the load impedance must never fall below 4 Ohms.
For the record, connecting 2 x 8 Ohms speakers in parallel on one of the amplifier
output will result in a 4 Ohms load for this output.
Calculating the impedance connected to an output can be done as follows:
Let us return to our 2 x 8 Ohms speakers:
LOAD = 1/(1/8 Ohms + 1/8 Ohms) = 1/ (0.125+0.125) = 1/0.25 = 4 Ohms
This clearly demonstrates you cannot add an extra speaker connected in parallel to
this bridged output without falling below a 4 Ohms impedance.
2 - In stereo mode the minimum impedance is 2 Ohms: 4 x 8 Ohms speakers
connected in parallel per side.
3 - Never connect the ground of the cables of your speakers.
Wi SERIES - Professional stereo amplifiers
- Short-circuits
In case of short-circuit (defective loudspeaker,
poorly isolated cable, etc.) this system will
automatically protect the amplifier. This system
detects short-circuits such as too low impedances
and reduces power stages levels. If the short-circuit
remains, all outputs will be disconnected by the
thermal protection system.
- Direct current protection
Whenever a channel detects a direct current
via its output connectors, all output relays will
automatically open to prevent damages to your
speakers.
- Very low frequencies (<40 Hz)
The internal high-pass filter gets rid of very
low frequencies. Despite all that, whenever an
excessively low frequency is detected a relay will
deactivate the output.