Mit dem neuen Headset höre ich die anderen in der Besprechung viel besser.

Because mit always takes the dative case in German.

• das Headset = the headset
• in the dative, das becomes dem
• the adjective neu gets the ending -en after a definite article in this form

So:

• das neue Headset = the new headset
• mit dem neuen Headset = with the new headset

Headset is a borrowed word from English, but in German it has its own grammatical gender. The standard form is das Headset, so it is neuter.

That means:

• nominative: das Headset
• accusative: das Headset
• dative: dem Headset

German loanwords often keep their English form, but their gender still has to be learned.

This is because German main clauses usually follow the verb-second rule.

The first position in the sentence is taken by:

Mit dem neuen Headset

So the finite verb has to come next:

höre

And then the subject comes after that:

ich

So:

• Mit dem neuen Headset höre ich ... = correct
• Ich höre mit dem neuen Headset ... = also correct

The difference is emphasis. The given sentence puts more focus on with the new headset.

In German, the subject does not always have to come first.

You can tell ich is the subject because:

• it is the person doing the action
• the verb form höre matches ich
  (ich höre, du hörst, er/sie hört, etc.)

So even though ich comes after the verb, it is still the subject.

Die anderen is the direct object of höre — the people being heard.

Here, anderen means others or the other people.

German often uses andere without repeating a noun:

• die anderen = the others
• die anderen Teilnehmer = the other participants

In this sentence, the noun is understood from the context.

Also, in the plural, the article die is used for both nominative and accusative, so the form stays die anderen.

Because in can take either dative or accusative, depending on the meaning.

• dative = location / being in something
• accusative = movement into something

Here the meaning is in the meeting or during the meeting, so it is a location/context idea, not movement.

That is why German uses the dative:

• die Besprechung = the meeting
• in der Besprechung = in the meeting / during the meeting

Since Besprechung is feminine, its dative singular form is der.

It gives the context of the sentence.

It can be understood as:

• in the meeting
• during the meeting

So the idea is that, thanks to the new headset, I hear the other people much better while the meeting is happening.

Because besser is already a comparative form. It means better.

In German, comparatives are usually strengthened with words like:

• viel = much
• deutlich = clearly
• wesentlich = significantly

So:

• viel besser = much better

But sehr besser is not normal German.

Compare:

• sehr gut = very good
• viel besser = much better

Here it works adverbially: it describes how I hear.

German does not usually make a separate -ly form the way English does. The same form is often used for both adjective and adverb.

So:

• gut = good / well
• besser = better

In this sentence:

• ich höre ... besser = I hear ... better

In natural English, this sentence will often be translated with can:

• I can hear the others much better

But German often does not need können in this kind of sentence. Plain hören can already express that idea.

If you want to make the ability more explicit, you could say:

Mit dem neuen Headset kann ich die anderen in der Besprechung viel besser hören.

That is also correct.

Yes, German word order is fairly flexible, as long as the finite verb stays in second position in a main clause.

For example, you could also say:

Ich höre die anderen in der Besprechung mit dem neuen Headset viel besser.

That is grammatical, but it gives a different emphasis. The original sentence highlights mit dem neuen Headset right away, which makes the headset sound like the important new piece of information.