During the Chinese Spring Festival, my dad gave me an Edifier M120 Bluetooth speaker. This speaker is not one of these high-end models featuring dedicated bass speakers or professional Bluetooth audio codecs such as aptX and LDAC; it's just a unit with two ordinary speakers. With that said, I doubt I can hear any difference with those advanced codecs on a portable speaker anyway. But when I played some music with my phone connected to it, I realized that it does have some bass output. Speaking of bass, I'm impressed by a JBL Charge 4 speaker bought by one of my classmates. As a portable speaker that costs 150 , i t h a s a d e d i c a t e d b a s s u n i t w i t h a s t o n i s h i n g p o w e r . T h e n I b e g a n t o t h i n k t h a t ,...