German · Pronunciation Guide
dass BOOKH. A long, firmly rounded 'oo' and then the throaty ach-laut.
Nothing competes for the beat in a one-syllable noun. The plural Bücher does two things at once: it fronts the vowel to a long ü and, because the vowel is now a front one, the ch flips to the soft ich-laut. So the singular scrapes at the back and the plural hisses at the front — the rule follows the vowel, not the letters.
Listen: das Buch
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Ich lese ein gutes Buch.
I'm reading a good book.
Listen: Ich lese ein gutes Buch.
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Ich lese ein gutes Buch gives the adjective the -es ending for a neuter accusative noun, since ein supplies no gender information. Lese has a voiced s between vowels, so the sentence has a buzz in the middle and a scrape at the end.
Substituting a k gives 'book', which is exactly the English word and therefore very tempting. Keep the air flowing at the back of the mouth. The plural is the second thing to internalise: Bücher takes the soft hiss, so learners who have drilled the throaty ch have to switch it off when the umlaut arrives.