Loudspeaker dream meaning is explained below using 3 different sources. Each interpretation is shown with its source.

Interpretation 1 — Tony Crisp

Something we have heard, something which is trying to gain ‘a hearing’; how we receive aural information— in one ear and out the other, or is it received and understood?
Source: A Guide to Dreams and Sleep Experiences Author: Tony Crisp

Interpretation 2 — Stearn Robinson - Tom Corbett

An unpleasantly high volume of sound signifies approaching worries, but if you adjusted the volume, the dream indicates recognition for useful social or charity work.
Source: The Complete Guide to Interpreting Your Dreams Author: Stearn Robinson - Tom Corbett

Interpretation 3 — James R. Lewis and Evelyn Dorothy Oliver

A loudspeaker may be the mind’s way of trying to get our attention, especially about something that we have forgotten or an action we have delayed.
Source: Dream Symbols in The Dream Encyclopedia Author: James R. Lewis and Evelyn Dorothy Oliver