German · Pronunciation Guide
GROHSS. A hard g, a throaty r, a long pure 'oh', and the ß as a plain hissing s.
The ß is the spelling's way of telling you the vowel inside is long — that is the whole modern rule for choosing ß over ss. Endings do not disturb it: großes and großen both keep the long o under the beat while the ending stays unstressed.
Listen: groß
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Sie wohnen in einem großen Haus.
They live in a big house.
Listen: Sie wohnen in einem großen Haus.
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Sie wohnen in einem großen Haus has in taking the dative because nothing is moving, which produces einem and the matching adjective ending -en. Haus carries the 'ow' diphthong and an unvoiced final s, so the sentence ends with the same hiss the adjective started with.
The ß reads as a capital B to newcomers, which is the first thing to unlearn. The second is vowel length: English readers see a doubled-looking consonant and shorten the vowel to the 'o' of gross, but German does the reverse here — ß signals a long vowel, so the o is genuinely held. Say it as a sustained note before the s arrives.