**RT60** (1.8–2.2 s for symphony): overall liveness and warmth - **C80** (-2 to +2 dB for orchestra): clarity and definition of musical texture - **G** (4–8 dB at mid-audience): acoustic loudness/strength of the hall - **IACC** (< 0.4 preferred): spatial impression and envelopment - **ST1** (stage s