Park Audio II GS Series, Руководство пользователя

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6
FUNCTIONAL FEATURES
Output Short-Circuit Protection
Individual per each channel. Protects the output stage of the power amplifier against
short-circuiting, as well as limits the output current when a maximum-level sine signal is
applied continuously to 2-Ohms loudspeaker.
The protective system does not switch the amplifier off, so it resumes its unattended operation
after the short-circuiting conditions are gone.
Overload Protection
The double-stage overload protection system, independent for each channel, protects
the output stage and optimizes the quality sound under overload.
In case of a short-time overload (e.g. overload caused by a sudden drop of complex load
impedance), only the output stage current protection goes active limiting the current running
through the output transistors at the safe level. In this case, the protection system does not
preclude the amplifier from delivering, for a short while, a full output power (without any
output voltage reduction) even to loads of very low impedance.
In case of a more continuous overload, the protection system activates the built-in Clip-
limiter, which reduces the level of the input signal and thus eliminates the distortion, caused
by hard clipping.
DC Output Protection
Independent for each channel. Prevents DC damage to loudspeakers.
The amplifier’s schematics precludes transit of any clicks or noise during the power-on/off
transition process.
Protection of loudspeakers against DC damage is ensured for each channel by individual power
supply units which are disabled in the event of output DC voltage or any powerful LF fluctuations.
In case the protection system becomes active on both channels and both power supply units
become disabled, all indicators go off.
The amplifier can be restarted with the POWER toggle switch, by way of turning the amplifier
off and turning it on, about 2 minutes later again, irrespective of the fact whether the
protection system is active on a single channel or on both channels.
High Frequency Protection
Independent for each channel. Prevents any damage to HF drivers as might be caused
by non-musical signals of powerful high frequency spectrum.
Should any powerful high frequency fluctuations occur on the output either as a result of poor
contact in the input cable connectors, or being transmitted to the amplifier’s input by any
other device (such as a crossover or mixing console), the protection system activates the
built-in Clip-limiter to reduce the input signal level.
Thermal Protection
Independent for each channel. Protects the amplifier’s output stage against overheating.
In case the temperature of the output stage transistors rises to 85°С, the thermal protection
system disables the input signal and the output stage of the respective channel. After cooling
down to the rated temperature, the amplifier automatically resumes operation.