Questions & Answers about Die Tonanlage ist sehr laut.
Because Tonanlage is a feminine noun in German, so its nominative singular article is die.
A useful thing to know is that German nouns have grammatical gender:
- der = masculine
- die = feminine
- das = neuter
So in this sentence, die Tonanlage is the subject, and feminine nouns in the nominative take die.
Also, die can mean:
- the for a feminine singular noun
- the for any plural noun
Here it is feminine singular, not plural.
Tonanlage is a compound noun, which is very common in German.
It is made from:
- Ton = sound, audio
- Anlage = system, installation, setup
So Tonanlage means something like:
- sound system
- stereo system
- audio system
In German, compound nouns are written as one word, not as separate words.