Aspire 4
Four Driver In-Ear Monitors
Monitor your performance and enjoy your favourite music with 64 Audio's next generation of universal in-ear monitors (UIEM), specifically designed for musicians, live music professionals, and music lovers.
Since 2010, 64 Audio has crafted thousands of custom in-ear monitors for some of the world's greatest musical talent. Working with these discerning and critical entertainers has shaped our products and technological development, now culminating in our most accessible UIEM to date.
Whether you're just getting into in-ears, aren't ready for customs, need a backup set, or simply prefer the flexibility of universal fitting products, Aspire 4 offers best-in-class sound and ergonomics. Sharing the same legendary 64 Audio DNA and patented technology but featuring a new shell design, new cable connector, and new tuning, Aspire 4 is a great choice for anyone who needs to Hear Like a Pro.

With reproducing live music at the forefront of our tuning criteria, do we make a highly accurate unforgiving studio monitor or a contoured device that helps musicians hear themselves more effectively?
As with many of our monitoring tools the answer is somewhere in the middle, blending accuracy with musicality.
Aspire 4 features huge bass that can reproduce some of the toughest frequencies in the audible spectrum with quick ease. It has enough slam to feel a real impact, making it an IEM that isn't only suitable for on-stage performers or bassists and drummers in the studio, but one that will also appeal to bassheads at home seeking both quantity and quality of bass.
Forward mids are precisely elevated for articulation in the most vital region of instruments and voices. And plenty of top end sparkle really separates Aspire 4 from any other UIEM in its class, making this powerful sound signature a perfect blend of accuracy and musicality.
This is accomplished through the use of multiple styles of drivers, creating a hybrid design to achieve our desired sound. Aspire 4 combines the use of three balanced armature drivers for the mids and highs and a single dynamic driver for the lows, crossed over three ways to create a unified sound signature.

Aspire 4 features exclusive technologies that challenge traditional in-ear monitor designs to give you the absolute best listening experience in this range.


Air Pressure Exchange Core
Apex Core is a deeper understanding of air movement within an earphone system, streamlining 64 Audio's renowned Apex system.
When you seal a miniature speaker in an ear canal, the air inside becomes trapped. As the speaker produces sound, it moves the air and causes the eardrum to work excessively. The pressure exerted on the eardrum causes ear fatigue, also known as listener fatigue. Apex Core relieves this pressure, allowing the eardrum to move naturally, so you can comfortably listen longer.
With Apex Core, our patented technology is seamlessly integrated into the body of the earphone. In Aspire 4, a pressure relieving channel provides a controlled leak via acoustic filters as opposed to pneumatically interactive foam in our traditional Apex™ implementation.
Thanks to Apex Core, Aspire 4 users can significantly reduce ear fatigue while maintaining roughly -20db of noise isolation.
Waveguide
Custom designed acoustic structure integrated onto the high-frequency balanced armature driver. Unique in its shape and implementation, this waveguide increases the driver’s efficiency by directing and focusing its energy for a crisp and clear sound. While hard to compete with the legendary response of our patented tia high-driver, this configuration may be the closest thing to it on the market.


Linear Impedance Design
Smartphones, body packs, amps, and DAPs produce audio with different output impedances. The interaction of the earphone impedance curve with the sources may result in the same IEM sounding different with different sources.
LID is a proprietary circuit that corrects the non-linear impedances of the multiple drivers in this four-driver IEM, restoring proper interaction with the source and preserving the desired sound signature, so you can enjoy the same sound reliably across sources.
Aspire 4 comes in a new lightweight form factor that prioritizes ergonomics without sacrificing performance. It features a durable stainless steel nozzle, seamlessly integrated with a molded ABS shell. This robust construction ensures consistent performance and longevity. With a flange design and mesh grill, ear tips won’t fall off by mistake and the sound bore will remain free of debris.
Aspire products are designed, packaged, and quality-controlled by highly skilled technicians in the United States after being assembled in China using components sourced globally from trusted suppliers.
The new 64 Audio IPX cable/connector is designed to combat the most humid and tough environments. Its main strengths are reliability and water resistance. On top of this cable having a much higher level of retention, over-time, it has a moisture resistance rating of IP67. The included detachable cable is 48" long, with a 90 degree 3.5mm jack.
IN THE BOX
- Aspire 4 Universal In-Ear Monitors
- Zipper Carry Case
- Foam + Silicone Ear Tips
- IPX Cable
- Cleaning Tool
- 1/4" Adapter
- Shirt Clip
Driver Configuration
1 Low Dynamic Driver
2 Mid Balanced Armature Drivers
1 High Balanced Armature Driver
Sensitivity
Impedance
11Ω @1kHz
Crossover
Integrated 3-way crossover
Isolation
-20 dB
Material
Molded ABS Shell
Stainless Steel Nozzle
For hygienic reasons, there are no returns on earphones once opened.
All our earphones are available for personal demonstration in-store. We encourage you to try before buying to ensure satisfactory sound, fit, and functionality.
If an item is defective upon receipt, please notify us within 30 days of purchase so we can arrange an exchange. For issues following 30 days, we will work with you and the manufacturer within the scope of each brand’s warranty and service policies.