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Speaker 15 x 11 x 4 mm and soundboard 15 x 11 x 5 mm.
To achieve higher sound with the different sound modules, you can increase the resonance space, use a larger speaker or install an amplifier circuit.
The circuit in the example scheme is suitable for all K1-5 sound modules. The advantage of this circuit is that the MOSFET amplifier doesn't collapse the DC-Car decoder voltage converter.