Design and features:These earphones have an integrated microphone and touch sensitive volume, music player, and call connect/disconnect controls for paired Bluetooth devices. Additional features include a monitor function that makes ambient sounds easier to hear while wearing the earphones, a right side earpiece that can be used alone for one ear monitoring of Bluetooth streamed audio and telephone communications, support for Google Assistant and Apple Siri digital voice assistants when used with Bluetooth devices that have those capabilities, and manufacturer claimed water resistance. The Momentum True Wireless comes with four pairs of ear pieces in various sizes, a USB charging cable, and a charging cradle/recharger battery/carrying case that the manufacturer claims can be used to recharge the earphone batteries up to two times between its own charges. The free Sennheiser Smart Control app download for Apple or Android mobile devices can be used to change the sound of the earphones, show battery level, to change various settings such as choosing between pausing and not pausing audio when the monitor function is activated and choosing between voice announcements and alert tones, and to update the earphone's firmware.
Sound quality: The Momentum True Wireless comes with a free app download that allows customization of its sound. The tone settings of the app do have a noticeable effect on the sound of these earphones, but our tests were done with the tone settings bypassed. We found these earphones deliver sound quality that falls in the Very Good range - they reproduce music and voice very well although they do have some noticeable sonic quirks. The overall sound can best be summarized as bassy and a bit muffled. The bass (as in bass drums, bass guitars, stand-up bass, etc.) goes deep, and depending on how it fits your ears, ranges from somewhat prominent and boomy with good impact to prominent and boomy with somewhat excessive impact. The midrange (voices, guitars, horns, etc.) is somewhat soft and hazy, a bit dark (there is an opaqueness that covers up fine detail) and congested (think sonic traffic jam), and depending on the program material may be slightly overwhelmed by the bass. The treble (cymbals, the upper range of violins, etc.) is extended, but is somewhat sizzly (sounds that should have a delicate shimmer have a sound reminiscent of bacon frying). The sound doesn't have much of a sense of liveliness, is somewhat closed sounding (sound-wise it's fairly obvious you have something plugging your ears) and it only does a so-so job of recovering the room ambience of a recording (the sense of the acoustic space in which the audio program that's being listened to was recorded).
Comfort: As typical of in-ear models they produce a sense of pressure in the ear canal opening that might be uncomfortable for some. Users with small ear bowls might find that the earphone body does not fit securely into their earbowl and that the earphones are mostly held in place by the section of the earphone that is inserted in the ear canal. Users with medium and larger sized ear bowls will probably find that this model fits and stays in place with no problems.
