1. The connection sequence of bass sound system equipment: mixer (1-2 grouping) → equalizer → frequency divider → voltage limiter → bass amplifier → bass speaker.

2. Auxiliary sound system equipment connection sequence: mixer (3-4 grouping) → equalizer → delay device (optional) → voltage limiter → auxiliary speaker power amplifier → auxiliary speaker.

3. Connection sequence of main audio equipment: mixer (L-R main channel) → equalizer → exciter (optional) → feedback suppressor (optional) → voltage limiter → main speaker power amplifier → main speaker. ?

4. Connection sequence of monitoring audio system equipment: mixer (auxiliary output) → equalizer → voltage limiter → monitor speaker power amplifier → monitor speaker.