audiophony SMi600 SMi1000 SMi1500 SMi2000 Benutzerhandbuch - Seite 10
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7 - Protection systems
Because
Audiophony
professionals need, our SMi amplifiers are equipped
with many protection systems to guarantee the best
possible lifespan for the internal components of your
amplifiers and all devices connected to their outputs.
- SoftStart System
Upon activation of your amplifier or activation of one
of the protection system, the Softstart system will
slowly increase the output so the speakers will not
have to deal with sudden peaks.
- Thermal protection
The thermal protection circuit will open output relays
in case of excessively high temperature (more than
105°C). The fans will be at their maximum speed and
the amplifier will be functional again once the normal
temperature has been reached.
- Short-circuit
This protection takes effect upon detection of a short-
circuit via one of the output (defective loudspeaker,
poorly isolated speaker cable, etc.).
This
system
detects
excessively low impedances and reduce the voltage
output of your amplifier to prevent the destruction of
power transistors.
Affected outputs will be disconnected by the thermal
protection system if the short-circuit continues.
Page 10
knows
what
short-circuits
such
Important notes about the Bridge mode
1 - In Bridge mode, the load impedance must never go below 8 Ohms.
By connecting 2 x 8 Ohms speakers in parallel mode on a single output, this output
will have a 4 Ohms impedance.
To determine the impedance connected to an output, please proceed as follows:
In case of 2 x 8 Ohms speakers:
CHARGE = 1/(1/8 Ohms + 1/8 Ohms) = 1/ (0,125+0,125) = 1/0,25 = 4 Ohms
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 your speakers.
SMi series - Professional SMPS stereo amplifiers
sound
- DC Offset protection
The output relays will open automatically to prevent
damage to your speakers if one of the channels
detects direct current via one of its output connectors.
- VHF Protection (VHF)
Upon detection of a frequency higher than 10 KHz via
one of the output (such as microphone feedbacks)
the amplifier will open the output relay within 3
seconds. The Protect LED will light up.
The system will test the output again after a
10-second period and let the relay open if the high
frequency is still present.
- CLIP / Limiter protection
In the event of an output distortion higher than 0.5%,
the limiter will be activated and decrease the input
signal level in order to reduce the distortion.
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