The amount of PA accessories that you will need to consider is largely influenced by the size and sophistication of your PA.
Simple set-ups may just need speaker and microphone stand whilst at the opposite end of the scale there may be electronic crossovers and in-ear monitoring to consider. Whatever size PA you may operate there are various accessory options that you will need to know about and consider their inclusion in your own set-up.
Speaker Stands & Vocal Effects
Speaker stands and mounts are important, so that the speakers can be raised to an appropriate height and it that way the sound can be dispersed to the back of the venue, providing a much better sonic spread and ensuring that both music and vocals are clear and coherent. Vocal effects such as reverb and delay will help to give your singer's voice a degree of spatial presence, and soften the tone when compared to a dry signal.
It may be that your drummer plays with a click track to facilitate MIDI or recorded backing tracks, in which case a good pair of closed back headphones may be an important accessory. In-ear monitoring is now much more affordable, so the use of earphones and the appropriate auxiliary equipment to achieve this may be a consideration.
Essential PA Peripherals
Finally, your system may use a routed frequency device such as an electronic cross-over, and so the necessary cabling and rack systems to facilitate this may be high on your list of priorities. These are just some of the accessories that may be required to be used in conjunction with your PA system …