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Jun 24, 2016
TWF31 and TWF41 both has balanced sound and excellent staging, resemble open back headphones, courtesy of the piezoelectric driver. TWF31 has freq range from 10-40000hz, whilst TWF41 is 10-45000hz. TWF31 has more warmer darker sound than it's sibling. Both has smooth midrange and high. It really is smooth unlike BA sound, but yet still detailed. TWF41 has more detail in high notes than it's sibling. Bass is good on both iem, has enough impact and focus. Separation for each instrument is also good for both iem. They good for jazz and live acoustic music, but not so much for metal or aggressive fast paced music
Jun 24, 2016
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