Are you looking for a music-sound system or a system to annoy neighbours? Some military equipment manufacturers would have good knowledge in the latter. Deep bass is omnidirectional. For music, you can use a low sub system, where your electronic crossover cut at or 100Hz — or even 80Hz — by 12dB or more per octave. You will need an active system, so you have enough amplifier power for the very low frequencies; watts in the amp is more important than quality for the deep spectrum. In general, you will be talking about a 4-way system, with normal 3-way system for anything above the deep sub. Speakers for deep sub works best on ground level to use floor-coupling; preferably 2x18", or 1x21", or 1x24" sub-bass in dedicated sub-boxes. 24" was the size of speaker used in the "Earthquake" film-sound system, but 21" works equally good — I used it in cinema designs — you only need a mono system for that deep frequencies, which is same way Dolby-stereo works. It saves you for buying more than one speaker box and one huge amp — preferably one that can be bridged — if it's not a larger open air concert set-up, you are considering. If you instead had wished to point the sound on one direction, a kind of original "Turbosound"-tube with a 10° dispersion might work with less amp-power. So, your suggested modest 10k baht-system won't do anything more than working in a living room as sub on your flatscreen. For travelling one kilometer — be aware of both wind and air temperature, works better at night than in daytime — you'll likely need something like 4 deep subs, or more, with 1,000 to 3,000 watt amp-power for each sub; talking from experience. Note, it's the real stuff mentioned here, not Thai-style watts...
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