Yea it is Indo. I'm also curious myself what kind of speakers are those, probably for outdoor/stage, most outdoor sound systems connectors are different using XLR for interconnects, so I guess they use different connectors too for the speakers.
Anyway, I found Sony speakers from an old Compo (vcd era) in my storage and pair it with Aiyima A07, and wow it sounds more powerful than my 6.5 inch bookshelf speakers. I kinda miss big speakers, using bookshelf speakers for so long, even with subwoofer, it's different from big speakers.
Here's how the speakers look like.
I guess so, everything is different, even the interconnect is using XLR, and there's CH like car audio.
Ah I see, must be it.
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