A hangosítás megfelelő a koncerthez.

Hangosítás comes from the verb hangosít, meaning to amplify, to make louder, or to provide sound reinforcement.

As a noun, hangosítás can refer to:

• the sound system
• the sound setup
• the PA / amplification
• the overall sound reinforcement

So in this sentence, it most naturally means something like the sound system or the sound setup.

Here, megfelelő is functioning as an adjective, meaning suitable, appropriate, or adequate.

It is historically related to the verb megfelel (to suit, to comply with, to be suitable), but in this sentence megfelelő is not the main verb. It is simply describing hangosítás.

So:

• megfelelő = suitable / appropriate
• not suits or is suitable by itself

Hungarian often leaves out the verb to be in the present tense, third person, when the predicate is a noun or adjective.

So:

• A hangosítás megfelelő a koncerthez. literally looks like The sound system suitable for the concert
• but it means The sound system is suitable for the concert

This is normal Hungarian grammar.

Compare:

• A hangosítás megfelelő. = The sound system is suitable.
• A hangosítás megfelelő volt. = The sound system was suitable.

In the past tense, volt appears, so you can see the hidden is-type relationship more clearly.

Because here megfelelő is a predicate adjective, not an adjective directly attached inside the noun phrase.

There is an important difference:

• a megfelelő hangosítás = the appropriate sound system
• a hangosítás megfelelő = the sound system is appropriate

So in your sentence, hangosítás is the subject, and megfelelő is what is being said about it.

Koncerthez is made of:

• koncert = concert
• -hez = a suffix meaning roughly to, toward, or in some contexts for / suitable for

With megfelelő, Hungarian uses -hoz / -hez / -höz to express the idea suitable for or appropriate to something.

So:

• a koncerthez = for the concert / suitable to the concert

This is one of the places where Hungarian uses a case ending instead of an English-style preposition.

This is due to vowel harmony.

The suffix has three forms:

• -hoz
• -hez
• -höz

Which one is used depends on the word it attaches to. In basic terms:

• back-vowel words often take -hoz
• front-vowel words often take -hez
• front rounded vowels often take -höz

Koncert takes -hez, so the correct form is koncerthez.

One extra detail: words like koncert are loanwords and do not always fit the simplest version of the vowel-harmony rules perfectly, so sometimes the safest method is just to learn the correct suffixed form.

A and az are the Hungarian definite article, both meaning the.

The choice is based on the next word:

• a before a consonant
• az before a vowel

So:

• a hangosítás = the sound system
• a koncerthez = for the concert

Even when a noun has a case ending, the article still stays in front of it:

• a koncerthez
• az asztalhoz

So the suffix on koncerthez does not replace the article.

Yes, but the nuance changes.

• megfelelő = suitable / appropriate / adequate
• jó = good
• alkalmas = suitable / fit for, often a bit stronger or more explicitly about being fit for a purpose

So:

• A hangosítás megfelelő a koncerthez. = The sound system is appropriate/suitable for the concert.
• A hangosítás jó a koncerthez. = The sound system is good for the concert.

Megfelelő sounds a bit more neutral and matter-of-fact, as if it meets the requirements.

Not completely. Hungarian word order is fairly flexible, and it often reflects topic and emphasis rather than strict grammatical roles.

Your sentence:

• A hangosítás megfelelő a koncerthez.

is a very natural, neutral order:

• topic/subject first: A hangosítás
• then the statement about it: megfelelő a koncerthez

Other orders are possible in the right context, but they would usually sound more marked or more emphatic.

A rough pronunciation guide is:

• A = short aw/uh sound
• hangosítás ≈ HAHN-go-shee-taash
• megfelelő ≈ MEG-fe-le-luh-øø
• a koncerthez ≈ aw KON-tserth-ez

A few useful letter notes:

• s in Hungarian = English sh
• c = ts
• h is always pronounced
• é, í, ő, á are long vowels
• stress is normally on the first syllable of each word

So the main stresses are:

• A HANgosítás
• MEGfelelő
• a KONcerthez