Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.
The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.
Devices with a subwoofer have a higher quality, deeper bass.
A passive radiator is a type of driver (speaker) that doesn't have a voice coil and a magnet. The sound vibrations produced by a passive radiator depend on its mass and the size of its enclosure. It is usually used in combination with a woofer to produce deep bass tones.
The highest frequency at which device produces audio. The higher the high-frequency response, the clearer and crispier the treble.
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.