Speakers

Various sizes of speakers available from Zimo based in Austria, ESU based in Germany, and Soberton in the US.

It is typically best to use the largest possible driver and enclosure (speaker) in your model to produce the best bass frequency response and overall volume capability. This way you should be able to run the speaker at a reasonable volume* to achieve your desired result.
*The volume level can be controlled by your sound decoder of choice, always ensure you are operating within it’s recommended range.