In recent years public service and all land mobile has moved to narrow band FM from the old 12.5khz or 5khz bandwidth FM to new 2.5 and 1.25 khz format.
The older scanners will play these transmissions with much lower volume and there is nothing that can be done to the scanner to solve this.
You can buy an amplified speaker and use that to further boost the audio or just replace the scanner with a new scanner built by Uniden or GRE (General Research Electronics) who make almost every scanner on the market. Both are good units.
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