chamber orchestra
US /ˈtʃeɪm.bər ˌɔːr.kɪˈstrə/
UK /ˈtʃeɪm.bər ˌɔːr.kɪˈstrə/

1.
orchestra da camera
a small orchestra, typically with 10 to 40 players, that plays in a small hall or chamber
:
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The chamber orchestra performed a beautiful Mozart symphony.
L'orchestra da camera ha eseguito una bellissima sinfonia di Mozart.
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They are looking for new musicians to join their chamber orchestra.
Stanno cercando nuovi musicisti per unirsi alla loro orchestra da camera.