This speaker features four 1.5inch drivers at a 90-degree angle to each other, two left channels and two right channels, this way the speaker will produce a stereo sound no matter the direction you listen from, consequently emulating a 360-degree stereo sound.
The speaker also features two passive radiators confined to two separate enclosures inside the speaker.
Watch video - https://youtu.be/ok70Il5CRR8
Circuit diagram - https://drive.google.com/open?id=1kEMBpG0BEwY0vnrUJX-53PiAddJggf-W
1- 1.5 inch 3w speakers
2- Bluetooth module
3- Audio amplifier (TDA2030)
4- 3s Battery protection module
5- step down module
6- Dc to dc isolation module (B0505S-1W)
7- Dc jack 5521
9- Passive radiator
You can get all the item listed from my wish list on aliexpress -