IPX8 Waterproof Wire-less Earbuds 8mms dual drive units Headphones BT5.0 Charging Case Binaural Stereo Earbuds support most of bluetooth devices enjoy 6D strong deep bass music sound (Black, 2000mAh)

[Music] [Music] [Music] the first file tests your headphones bass extension the following frequencies ranges from 200 Hertz to 10 Hertz good headphones will go as low as 20 Hertz the lowest limit of our hearing let's see how far can you go [Music] [Laughter] the second file tests your headphones treble extension good headphones will reproduce frequencies up to 20,000 Hertz the upper limit of human hearing range [Music] poorly built headphones may start to rattle whenever loud for a deep bass content is played the next file scans bass frequencies and will literally shake your drivers when turning the level up adjust the volume in your headphones so that the test is made at a high level the sweeping tone should remain pure and clear at all frequencies without any buzz [Music] you [Music] better headphones have tighter tolerances in the variation of their drivers frequency responses to rep