Its acoustics enabled audiences to hear speakers' voices and music distinctly without benefit of the as-yet-not-invented  electronic amplifier.
ɪts ɐkˈuːstɪks ɛnˈeɪbəld ˈɔːdiənsᵻz tə hˈɪɹ spˈiːkɚz vˈɔɪsᵻz ænd mjˈuːzɪk dɪstˈɪŋktli wɪðˌaʊt bˈɛnɪfˌɪt ʌvðɪ æzjˈɛtnˌɑːtɪnvˈɛntᵻd ᵻlɛktɹˈɑːnɪk ˈæmplɪfˌaɪɚ.