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마이크 소리 means the sound of the microphone or the microphone’s sound.

• 마이크 = microphone
• 소리 = sound
• -가 marks 소리 as the subject

So the sentence is talking specifically about the sound coming from the microphone, not the microphone itself as an object.

Compare:

• 마이크가 작아졌습니다 = The microphone became small. / The microphone got quieter.
  This is possible in some contexts, but it is less specific and can sound ambiguous.
• 마이크 소리가 작아졌습니다 = The microphone’s sound got quieter.

Using 소리 makes the meaning much clearer.

점점 means gradually, little by little, or more and more.

It shows that the change happened progressively over time, not all at once.

So:

• 소리가 작아졌습니다 = The sound became quieter.
• 소리가 점점 작아졌습니다 = The sound gradually became quieter.

It is very commonly used with change verbs like:

• 점점 커졌습니다 = gradually got louder/bigger
• 점점 좋아졌습니다 = gradually got better
• 점점 추워졌습니다 = gradually got colder

Yes, 작다 usually means small, but it can also describe sound and mean quiet or low.

In Korean, big/small is often used where English uses loud/quiet:

• 소리가 크다 = the sound is loud
• 소리가 작다 = the sound is quiet

So in this sentence:

• 작아졌습니다 = became smaller → for sound, became quieter

This is very natural Korean.

It breaks down like this:

• 작다 = to be small / quiet
• -아지다 = to become
• -었- = past tense
• -습니다 = formal polite ending

So:

• 작다
• → 작아지다 = to become small / to get quieter
• → 작아졌습니다 = became smaller / got quieter

This pattern is very common:

• 좋다 → 좋아지다 = to become good / get better
• 나쁘다 → 나빠지다 = to become bad / get worse
• 커지다 = to become big / get louder
• 조용해지다 = to become quiet

Good question. The difference is:

• 작았습니다 = was small / was quiet
• 작아졌습니다 = became small / became quiet

So 작았습니다 describes a state, while 작아졌습니다 describes a change.

Because the sentence includes 점점 and talks about the sound changing over time, 작아졌습니다 is the natural choice.

Compare:

• 마이크 소리가 작았습니다. = The microphone sound was quiet.
• 마이크 소리가 점점 작아졌습니다. = The microphone sound gradually became quieter.

Because this sentence is not describing someone doing something to the sound. It describes the sound changing on its own.

The core structure is:

• 마이크 소리가 = the microphone sound
• 작아졌습니다 = became quieter

This is an intransitive-style idea: something changes state.

There is no direct object here, so no -를 is needed.

Yes. 소리가 is the grammatical subject.

• 소리 = sound
• -가 = subject marker

The sentence is literally structured like:

The microphone’s sound gradually became quieter.

Even though English might focus on the microphone, Korean is focusing on the sound as the thing that changed.

You could, but it may sound less clear.

마이크가 작아졌습니다 could be understood in different ways depending on context:

• the microphone became physically smaller
• the microphone became quieter
• the microphone volume went down

If you want to clearly say the sound from the microphone got quieter, 마이크 소리가 점점 작아졌습니다 is much more precise and natural.

-습니다 is the formal polite style.

So 작아졌습니다 is appropriate in situations like:

• announcements
• reports
• presentations
• writing
• speaking politely in a formal setting

A less formal polite version would be:

• 마이크 소리가 점점 작아졌어요.

A casual version would be:

• 마이크 소리가 점점 작아졌어.

Yes, but 마이크 소리가 점점 작아졌습니다 is the most natural and common order.

You may also see:

• 점점 마이크 소리가 작아졌습니다.

This is also grammatical, but it puts a little more focus on gradually at the start.

In many cases, adverbs like 점점 are flexible in Korean, but not every position sounds equally natural. For this sentence, placing it before 작아졌습니다 is very natural.

Usually, yes. In context, it most naturally means that the sound coming through the microphone gradually got quieter.

Possible real-world reasons could be:

• the volume was lowered
• the battery was dying
• the connection got weak
• the speaker moved farther away

The sentence itself does not specify the cause. It only describes the result: the sound got quieter over time.

Yes, but the nuance changes.

• 소리 = sound
• 음량 = volume level

So:

• 마이크 소리가 점점 작아졌습니다 = The microphone sound gradually became quieter.
• 마이크 음량이 점점 줄었습니다 = The microphone volume gradually decreased.

The original sentence sounds more natural in everyday speech because 소리 is very common and intuitive. 음량 sounds a bit more technical.

Here are some very useful related patterns:

• 소리가 크다 = the sound is loud
• 소리가 작다 = the sound is quiet
• 소리가 커지다 = the sound gets louder
• 소리가 작아지다 = the sound gets quieter
• 점점 커졌습니다 = gradually got louder
• 점점 작아졌습니다 = gradually got quieter

Example sentences:

• 음악 소리가 너무 큽니다. = The music is too loud.
• TV 소리가 작아요. = The TV sound is quiet.
• 빗소리가 점점 커졌어요. = The sound of the rain gradually got louder.
• 사람들 목소리가 점점 작아졌어요. = People’s voices gradually became quieter.

These all use the same basic pattern as your sentence.