Audio-Technica ATH-ANC23BK vs Audio-Technica ATH-ANC33iS

Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.

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The device comes with its own special case or pouch, which is useful for safe transportation.

Allows you to change ear pads without buying new ones.

The in-ear device is ultracompact and lightweight, with little or no interference with earrings, spectacles, hats, or hairstyles. It is inserted in the ear canal itself and blocks out a lot of environmental noise. It has stronger bass tones and is unlikely to fall out of the ear.

An L-shaped plug is better if the jack is on the left or right side of the device, so that the cable isn't bent, and is less likely to break when the device is in your pocket.

The highest frequency at which device produces audio. The higher the high-frequency response, the clearer and crispier the treble.

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The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.

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Devices with a higher sound pressure level are generally louder when supplied with any given audio source.

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The device sits tightly in place, creating an acoustic seal which reduces background noise and prevents your music from leaking out.

Impedance is the device’s electrical resistance to the current being pushed through it. The lower the impedance, the easier it is to get higher volume and requires less power.

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This type of device allows you to listen at lower volume levels, causing less ear fatigue as you don't have to crank up the volume to overcome background noise. Ideal for plane rides and morning commutes.

The battery is removable and can be replaced by the user if broken.

A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.

A headset is one headphone or pair with a built-in microphone. Headsets can be used for apps that require communication i.e. Skype, games with voice chat, mobile phones, etc.

There is a control panel on the cable, so you can easily operate the device without having to interact with it.

These microphones are designed to filter out background noise from the desired sound. Especially useful in noisy environments.