The 1964-Qi IEMs have four drivers per ear with triple crossovers, focusing two drivers on bass for a powerful yet controlled low-end experience.

These IEMs offer a wide tonal range, reaching deeper lows and higher highs beyond typical hearing capabilities, enhancing detailed music textures.

ADEL technology reportedly enhances soundstage, allowing for higher volume listening without ear damage, though its effectiveness varies among users.

Users report a realistic bass sensation, feeling as if their chest vibrates with deep bass, despite the sound being isolated within the ears.

The company's consumer service is highly praised, particularly for their responsiveness and order tracking process, enhancing the buying experience.

Owners highlight the U3's neutral sound signature with slight bass emphasis, providing excellent vocal clarity and soundstage, making it a significant upgrade from mid-range IEMs like MEE audio's M6 PRO.

The Qi's sensitivity necessitates starting with no equalization to avoid unwanted colorations, adjusting only after initial listening.

Despite the excellent fit and finish, some users with narrow ear canals might experience minor fit issues, potentially requiring a refit.

The U3's detachable cables feature flexible plastic coating, which prevents tangling and extends longevity compared to fixed cables in other models.

The 1964-Qi offers a cost-effective entry into custom IEMs, with quality equating to higher-priced models like Sensaphonics 2XS.

The final cost including impressions and custom artwork is $641; excluding artwork saves $35.

Users note the U3's soundstage rivals full-sized headphones like the Sennheiser HD600, despite typical limitations of IEMs.

The Qi model is essentially a V3 with an added bass driver, offering a choice for those preferring enhanced bass response over the V8, which is tailored for bass players.

One user utilizes the 1964-Qi IEMs for on-stage monitoring with Sennheiser EW 300 systems and Roland v-mixer Personal monitor mixers, highlighting their versatility in live settings.

The noise isolation is reported to be excellent, effectively blocking out ambient noise even without music playing.