effective speaker for open space, not room,

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Hello,

For different reasons, I want to make a speaker for using outside, open air. So far what I tried is a closed box I have at home and my previous main speakers (JPW sonata) with not good results.
The best would be I guess, the large horn speaker, but for sure that is not the size I'm looking for.

I plan to run it on TA2024, powered by an SLA 12V 7Ah battery.

I plan to make a box with maximum about 50 liter internal volume, but much less if possible.

I also have a car speaker set, a focal 165V2, not used for years.

I plan to make a transmission line speaker with that.

Do you guys have other suggestion?

I do not need big sound pressure, but it should be something acceptable for quality music outside.

?

Thanks,

JG
 
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