Die Lautstärke wird von meinem Handy automatisch geregelt, damit meine Ohren geschützt bleiben.

Die Lautstärke wird von meinem Handy automatisch geregelt, damit meine Ohren geschützt bleiben.
The volume is regulated automatically by my phone so that my ears remain protected.
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Questions & Answers about Die Lautstärke wird von meinem Handy automatisch geregelt, damit meine Ohren geschützt bleiben.

Why is wird geregelt used instead of an active construction like “mein Handy regelt die Lautstärke automatisch”?

Because the German sentence uses the passive voice to focus on the action (“the volume is being regulated”) rather than the actor. In the passive, the object of an active sentence (die Lautstärke) becomes the subject, and the original subject (mein Handy) either disappears or becomes an agent introduced by von. The active alternative would be perfectly correct, but changes the emphasis:
Active: Mein Handy regelt die Lautstärke automatisch, damit meine Ohren geschützt bleiben.

What role does von meinem Handy play here, and why not use durch?

In a German passive construction, the agent (the doer) can be introduced by von (rather than English “by”). Durch is also possible in some contexts but often implies a less personal or more instrumental cause. Von is the standard preposition with werden for living agents or devices spoken of as agents:
— Die Lautstärke wird von meinem Handy geregelt.
If you used durch, it would sound more like the volume is regulated through the means of your phone rather than by it.

Why is automatisch placed between Handy and geregelt?

automatisch is an adverb modifying geregelt (“regulated automatically”). In German main clauses with a finite verb in second position, adverbs that modify the main verb often come directly before the past participle in a passive:
Subject (Die Lautstärke) – finite verb (wird) – adverb (automatisch) – past participle (geregelt).

What exactly does geregelt mean here, and how does it relate to the verb regeln?
regeln means “to regulate,” “to adjust,” or “to control.” geregelt is its past participle, used in passive tenses. So wird geregelt literally means “is being regulated/adjusted/controlled.” It describes an automatic adjustment process.
Why is damit used instead of um … zu for expressing “so that”?

Both damit and um … zu express purpose, but:

  • um … zu requires an infinitive: um meine Ohren zu schützen.
  • damit introduces a full subordinate clause with its own finite verb at the end: damit meine Ohren geschützt bleiben.
    Use damit when the subject of the main clause and the subordinate clause is (logically) the same or when you prefer a full clause structure.
How does geschützt bleiben work grammatically? Why not werden geschützt?

This is an example of the resultative passive or stative passive with bleiben. Instead of describing the action (“to protect”), it describes the resulting state (“to remain protected”).

  • geschützt werden = “to be protected” (focus on the action)
  • geschützt bleiben = “to stay/remain protected” (focus on the ongoing state).
Why is the verb bleiben placed at the end of the subordinate clause?
In German subordinate clauses introduced by conjunctions like damit, the finite verb (here bleiben) always goes to the end. The typical order is: conjunction (damit) – subject (meine Ohren) – object/adverbials (geschützt) – verb (bleiben).
What does Lautstärke exactly mean, and are there synonyms I should know?
Lautstärke means “volume” or “loudness.” A common synonym is Volumen, but in everyday speech about sound levels, Lautstärke is more precise. You might also hear Pegel (gauge/level) in technical contexts.