The CX family includes in-ear headphones from the famous German brand Sennheiser. Unlike the other line of in-channel IE models, the CX models stand out for their diversity. If relatively simple vacuum plugs are located at the bottom of the internal hierarchy, then in the upper rows there are very advanced TWS models with active noise reduction and functions like Transparent Hearing and "intelligent" pause.


All representatives of the CX line belong to the category of vacuum headphones that need to be inserted deep inside the ear. Connection options include both a traditional cable and a wireless Bluetooth connection. In the latter case, the headphones can be connected to each other using a cable, or they can be completely wireless. Depending on this, the battery life is from 6 to 12 hours. Most representatives of the CX series are equipped with a headset with a built-in microphone and a remote control for sound adjustment, but there are options without them.

At the beginning of 2021, the main star of the series is the Sennheiser CX 400BT model. These are very musical headphones that are equipped with proprietary dynamic emitters with neodymium magnets, low harmonic distortion, high sensitivity and extended dynamic range. They also support aptX and AAC audio codecs, which guarantee accurate transmission of the audio signal squeezed into FLAC or Apple Lossless. In general, in terms of sound quality, they strive for a high level of Sennheiser Momentum and HD headphones.