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This speaker unit uses a 5cm class small full range speaker with yellow aramid fiber cone that sounds up to bass while still being energized.
Even if the source direct, it will sound clearly from vocal to treble, so it can be combined with a portable Bluetooth amplifier without equalizer function.
It runs well and has a low volume that exceeds the bad 8-10cm speaker.
Because the yellow is distinctive it is also recommended as a built-in speaker.

Please note that the connection terminal is smaller than the typical 110 type terminal.
Please note that soldering work is required.