I spend times during the summer on the Swedish west coat just north of Gothenburg. Every so often Wallenius -Wihlmsesen car carriers pass some 500 metrs out and there is a definite "humming" in the air when they are abeam. These are real big ships But evidently the true sound is very difficult to reproduce in a scale like manner - I have to accept that.
But what abt horns/fog horns? I do want the deep, reverbating sound from a large ship, not the "merry go round" sounds or steam whistles I have checked on the net. Maybe I can find what I want on you tube and then proceed as explained by Tug Fanatic. I know abt the german Beier Electronics very capable sound module but that has a real hefty price tag and I just want the horn now. So the search goes on...
Claes
Horn sound units are in two separate groups. Fairly cheap sound generators that produce a mix of tones and just that, or, usually costing rather more, playback units that play back recorded samples, with various levels of control depending on price. The sampled sounds, being taken from real life, have all of the ambience that the original had. All of the resonances and echoes of the original is there. Of course, you only get the benefit of that extra detail if the speaker setup can handle it and if the amplifier driving the speaker can provide the power needed.
One cheap way of using a single sampled sound is to get one of these -
https://www.ebay.co.uk/itm/0-5W-30sec-Recordable-Voice-Module-Greeting-Card-Music-Sound-Voice-Talk-Chip-/183096493879?var=They need a bit of modification to enable them to start on demand, and their output needs feeding to an amplifier that will do the job needed.