German · Pronunciation Guide
ALT with a short open 'ah', a bright l and a crisp t — the vowel of English alter, not the hollow one in all.
Everything happens in a single beat, but the comparative reveals what the vowel is really doing: älter fronts the a to ä, and the superlative ältesten keeps that fronting. The stress stays welded to the root while the vowel changes colour, which is the usual German pattern for adjectives that take an umlaut in comparison.
Listen: alt
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Das Haus ist sehr alt.
The house is very old.
Listen: Das Haus ist sehr alt.
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Das Haus ist sehr alt keeps the adjective bare after ist. Haus begins with a genuinely breathed h and ends on an unvoiced s after the 'ow' diphthong, while sehr has a long 'ay' with its r dissolving into a vowel — so the sentence quietly contains three of German's core vowel behaviours.
The l is the giveaway. English speakers pronounce it with the back of the tongue raised, which drags the a backwards and produces something close to 'awlt'. Keep the tongue tip forward and the a bright. The t is a smaller matter but still audible: American speakers tend to swallow a final t, while German releases it clearly.