64 Audio A4s - Quad Hybrid Drivers Custom IEM Earphones

Tia®
Tubeless In-Ear Audio (tia) is a patented IEM design methodology that aims to reduce unwanted resonance and distortion for a transparent and lifelike sound signature. The tia system is comprised of three major elements: open balanced armature tia drivers, the tia single-bore design, and tia acoustic chambers. A4s features two major elements of the tia system: the tia driver and the tia single-bore design.

Apex®
Air Pressure Exchange (Apex) is a patented vent that releases air pressure in a sealed ear canal all while retaining standard IEM levels of isolation; enabling musicians and music enthusiasts to listen more comfortably for longer. This venting alleviates listener fatigue and allows for a much more realistic soundstage. The m20 Apex modules are included with the A4s

LID®
Linear Impedance Design (LID) is a patented circuit that corrects the non-linear electrical resistance of the multiple driver-sets comprising this 4 driver IEM. Varying source amplifier output impedance in devices like smartphones, body packs, DAC/amps, and DAPs typically results in varying frequency response across them, depending on the increase in resistance. Restoring proper interaction with the source and preserving the desired sound signature enables a consistent reliable sound.

3D-Fit®
3D-Fit technology preserves the detail of your ear impressions using a new process of digital rendering and 3D-printing. Compared to conventional wax-dip molding, this process reduces distortion in the impression for the most precise and comfortable custom in-ear monitors available. All 64 Audio Custom In-Ear Monitors and Custom Earplugs are crafted using this process.

30 Day Fit Guarantee
Because of the many variables involved in creating a custom product, sometimes a fit adjustment is needed. 64 Audio offers a 30 Day Fit Guarantee (on approved impressions) to ensure that your IEMs fit comfortably and retain a proper seal. 64 Audio requires that you notify customer service within 30 days of receiving your IEMs to be covered by the 30 Day Fit Guarantee.