XTA apa-4e8, Руководство оператора

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APA-4E8 Operator’s Manual Page 47
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Mains RMS Current Limiter
As your APA is capable of drawing huge amounts of current from the mains supply (in excess
of the 32A long-term specified for the “PowerCon” mains connector), it has a programmable
mains current limiter that can be used to prevent excessive current draw, especially when
running on supplies with sensitive current breakers or on lower rated supplies (such as a 13A
domestic UK supply).
Exceeding the current limiter threshold will begin to gradually pull in limiters (separate to
those set by the user for speaker driver protection) to reduce the overall level. These limiters
have very slow attack and release times so their effect is more like gentle gain control than
dynamic limiting and so has a very benign effect on the audio.
It can be adjusted from the front panel by pressing MENU and navigating to the
UNIT SUB MENU and pressing ENTER, then press NEXT to highlight the option:
The current limit can be set to a minimum of 10.0A up to a maximum of 45.0A in o.1A
increments.
Evidence of this limiter becoming operational will be shown on the Incoming Mains Monitor
User Metric. If the current draw of the amplifier begins to exceed the threshold the current
meter will additionally display how much gain reduction is being automatically applied (only if
below the speaker protection limiter thresholds) to stay operational and keep playing.