ATH-ANC27 QuietPoint® active noise-cancelling over-ear headphones offer an outstanding combination of performance, value, comfort and portability. The headphones provide up to 85% noise reduction, and deliver exceptional sound quality with powerful bass, a natural midrange, detailed treble and precise imaging in an immersive soundfield. A detachable cord enables their use as cordless noise-cancelling headphones; the audio functions even if the battery runs down. The headphones feature cushioned ear pads and a padded adjustable headband for total comfort even during extended wearing. The ATH-ANC27 is ideal for use with portable music and DVD players, in-flight entertainment systems, laptop and desktop computers and many other devices, and is compatible with the Apple® iPod®, iPhone™ and iPod touch®.

Details on Noise Cancellation
Audio-Technica's QuietPoint® headphones use active noise-cancelling technology to reduce distracting background noise, providing an exceptionally comfortable and restful listening environment in areas with high ambient noise. Active noise-cancelling headphones have components not present in ordinary headphones:

Microphone – Noise-cancelling headphones feature a miniature microphone in the earpiece that picks up ambient noise (such as traffic, air-handling systems, etc.)

Noise-canceling circuitry – Electronics in the ear piece create a noise-cancelling wave that is 180° out of phase with the ambient noise. This wave acts like a noise eraser: it cancels out the annoying sounds that surround you without diminishing the audio you want to hear. The result…a peaceful enclave to enjoy the music or movies of your choice.

Battery – The noise-cancelling electronics are battery-powered.

Passive noise-reduction
Passive noise-reducing headphones and earphones do not offer active noise-cancelling electronics. Instead, closed-back sealed headphones, such as the ATH-M50, achieve passive noise-reduction by physically covering the ears to help block out external noises.

Passive noise-reducing earphones, such as ATH-CK9, offer an in-ear design that forms an acoustic seal that helps to block background noise and allow for increased fidelity at lower volume levels.

Features:

Reduces environmental noise up to 85%

Clear & impactful high-resolution audio

On/Off Switch in ear cup – no external modules

Audio continues to work even after battery depletes

Detachable cable for cordless noise cancellation

Also includes durable hard-shell travel case, ¼-inch plug adapter, airline adapter and AAA battery

Technical Data:

TYPE Active noise-cancelling

DRIVER DIAMETER 40 mm

FREQUENCY RESPONSE 20 – 20,000 Hz

QUIETPOINT® ACTIVE NOISE REDUCTION Up to 18 dB

MAXIMUM INPUT POWER 500 mW

SENSITIVITY 106 dB

IMPEDANCE 33 ohms

BATTERY AAA (alkaline)

BATTERY LIFE Up to 40 hours, typical (alkaline)

WEIGHT 192 g (6.8 oz), without cable and battery

CABLE Detachable 1.2 m (3.9') with 3.5 mm (1/8") stereo mini-plug output connector

CONNECTOR 2.5 mm

ACCESSORIES INCLUDED 6.3 mm (1/4") stereo adapter; airline adapter; AAA battery; carrying case with attached accessory pouch