Audio-Technica ATH-TWX9 True Wireless Active Noise-Cancelling In-Ear Headphones (Open Box) xlr-3 male Further the middle silencer is

Further the middle silencer is design to be adjustable (moved along the whole length)

which makes it difficult for heat to collect

Output impedance @ 1 kHz @ +7/+1 dBu: 113 Ohm

Through research into the relationship between spaciousness

to circuit design

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