Koss QXPro Quietzone vs Audio Technica ATH-ANC27 inexpensive noise cancellation headphones review

Koss Quietzone QZPro
40-20,000 Hz frequency response offers a full range of deep bass and treble clarity for ultimate sound quality and reproduction
Soft vinyl closed ear cushions create a tight seal around ears and reduce ambient noise
Active noise reduction technology eliminates unwanted low-frequency noise, creating a peaceful listening environment
Fully-collapsible design makes headphones perfect for travel
Extra-soft, padded headband delivers lightweight comfort for extended listening sessions
Approximately 30 hours of continuous play
Includes a 4 foot, single-entry straight cord and two-prong airline adapter
AUDIO TECHNICA ATH-ANC27 Noise-Canceling Headphones
3.9-ft cable
3.5mm stereo jack
Color: Black
QuietPoint active noise reduction up to 18 dB
40mm driver diameter
20-20,000 Hz frequency response
106 dB sensitivity; Max. input power 500 mW
33 ohms impedance