Tā shì gè dàsǎngmén, shuōhuà zhěnggè lóudào dōu néng tīngjiàn.
She has a loud voice - the whole hallway can hear her talking.
Tips
usage
大嗓门 can refer to someone's voice quality as a characteristic, or be used colloquially to describe someone who habitually speaks loudly. It is informal and slightly humorous in tone.