Bidhaa
- Acoustic vifaa, umeme - mtaalamu sauti-uhandisi
- Public anwani na sauti na mifumo
- Spika, kielelezo pembe
- Umeme transfoma, converters na rectifiers
- Vipaza sauti, cardioid majibu
- Vipaza sauti, kuchagua
- Vipaza sauti, kusimama aina
- Vipaza sauti, kusonga chuma
- Vipaza sauti, lapel
- Vipaza sauti, ruggedised