The A12t is noted for its crisp, clear sound with more bass/sub-bass compared to the A18t, making it more suited for those seeking a fun and engaging listening experience.

The A12t is sometimes preferred over the A18t for its musicality, despite the latter being slightly better for monitoring purposes.

Compared to HiFiMan HE-X, the A12s offer a similar large soundstage and airy quality, unlike typical IEMs.

The Sony IERM7 is often preferred over the U12t for smoother treble, while the Andromeda is noted for better tonal cohesion despite a narrower soundstage.

The A12t's mX or m15 APEX modules provide tight low-end control, but the filter module offering the most isolation may lead to excessive bass.

The ADEL technology enhances soundstage and creates an airy sound but sacrifices isolation, making A12s behave like open-back headphones.

Planned adjustable ADEL modules could modify ambient noise levels, but current auto-ADEL modules lack this flexibility.

Owners report that the 64 Audio A12t is highly sensitive to source and recording quality, enhancing the listening experience with high-quality recordings.

ADEL modules can cause microphonics, especially when moving, as wearer motion allows ambient sound like footsteps to intrude.

Some users find the A12t's treble uneven with a spike at 15-17kHz, causing fatigue for sensitive ears, but switching to M20 modules can alleviate this.

The U12t is praised for its balance and detail but may require EQ adjustments for an optimal experience, particularly in the treble range.

The fit of the A12t is described as perfect, with a softer-than-expected silver cable, adding to the comfort and ease of use.

The A12's craftsmanship is superior to JH Audio Roxannes, though minor imperfections like fingerprints on drivers and small acrylic bubbles exist.

The A12t is praised for its suitability with genres like orchestral music and classic rock, with specific mention of Metallica sounding impressive.

Best suited for stationary listening in quiet environments; not ideal for on-the-go use due to limited isolation.

Using Final E tips can significantly reduce the treble spike in the A12t, making it more comfortable for prolonged listening sessions.