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64 Audio

64 Audio Aspire 4 In-Ear Headphones

64 Audio Aspire 4 In-Ear Headphones

Regular price $899
Sale price $899 Regular price $899.00

Experience Professional-Grade Audio

Wearing style More information
Over-ear headphones sit over your ear and surround your ear with a ring of padding. On-ear headphones are padded but rest on top of your ear. In-ear monitors are worn inside your ear canal.


Driver type More information
Speakers and headphones use a device called a 'driver' to create sound. Different types of drivers have different strengths and weaknesses, but can all produce great sound. Common varieties include dynamic, planar magnetic, and electrostatic.

Dynamic, Balanced Armature

Connectivity More information
Connectivity refers to the method in which the headphones connect to the audio source. Headphones can be either wired or wireless.


Portability More information
DACs and amplifiers can either be carried around or meant for static desktop use


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64 Audio

64 Audio Aspire 4 In-Ear Headphones

Regular price $899
Sale price $899 Regular price $899.00

Monitor Your Performance with Precision

Introducing the 64 Audio Aspire 4 In-Ear Headphones, the next generation of universal in-ear monitors (UIEM) specifically crafted for musicians and live music professionals. Whether you are new to in-ear monitoring, not ready for custom-fit options, need a reliable backup, or prefer the convenience of a universal fit, Aspire 4 delivers best-in-class sound and exceptional ergonomics tailored for stage and studio use.

World-Class Sound for Musicians

Designed with live music as the primary focus, the 64 Audio Aspire 4 offers a perfectly balanced sound signature that blends accuracy with musicality. These in-ear monitors deliver powerful bass capable of handling the toughest frequencies, forward mids that enhance articulation, and sparkling highs that ensure clarity. Aspire 4 sets itself apart from other UIEMs with a sound signature that provides a clear, detailed, and immersive audio experience, making it an ideal choice for musicians who demand precision and reliability.

Heritage of Professional Excellence

Since 2010, 64 Audio has been at the forefront of custom in-ear monitor design, serving some of the world's top musical talents. The Aspire 4 shares the same legendary DNA and patented technology found in our custom models, making it the ultimate UIEM for anyone who needs to hear like a pro. The Aspire 4 is a testament to our commitment to delivering high-quality audio solutions that meet the rigorous demands of professional musicians.

Durable Stainless Steel Nozzle

The Aspire 4 features a durable stainless steel nozzle, seamlessly integrated with a molded ABS shell. This robust construction ensures consistent performance and longevity. The flange design and mesh grill prevent ear tips from falling off and keep the sound bore free of debris, providing a reliable and clean listening experience every time.

Innovative Apex Core Technology

Our patented Apex Core technology is seamlessly integrated into the Aspire 4, offering controlled pressure relief via acoustic filters. This innovative solution replaces traditional pneumatic interactive foam with a more efficient and durable system, ensuring comfort during extended use without compromising sound quality.

Advanced Waveguide for Enhanced Clarity

Aspire 4's high-frequency balanced armature driver is equipped with a custom-designed waveguide that increases efficiency by directing and focusing energy. This unique implementation enhances the driver's performance, resulting in crisp and clear high frequencies that stand out in any mix. The waveguide technology sets Aspire 4 apart, ensuring superior sound quality for professional use.

Technical Specifications

Specification Details
Color Black
Material Molded ABS Shell, Stainless Steel Nozzle
Driver Configuration 1 low dynamic driver, 2 mid balanced armature drivers, 1 high balanced armature driver
Frequency Response 20Hz - 18kHz
Impedance 11 ohms @ 1kHz
Sensitivity 104db @ 1kHz @ 1mw
Isolation -20db
IPX Cable 48" Black Detachable Cable with 90 degree 3.5mm jack

What's In The Box?

  • 64 Audio Aspire 4 In-Ear Monitor Headphones
  • Carry Case
  • Foam + Silicone Ear Tips
  • 48" Black IPX Cable
  • Cleaning Tool
  • 1/4" Adapter
  • Shirt Clip

64 Audio Aspire 4 FAQ

How is Aspire 4 different from your other custom and universal models?

Aspire 4 isn't custom fitting, so similar to our other Universal In-Ear Monitors (UIEMs) it requires the use of foam or rubber ear tips which are provided with the UIEMs. Unlike our other UIEMs (U4s, U12t, Fourte, etc.) Aspire 4 is built with an ABS molded shell and a stainless steel tip. It's also built with an IPX (or T2) socket as opposed to a 2-pin socket. Aspire 4 is also our only UIEM that isn't built with our tia technology.

Since it has four-drivers how does it differ from your other four-driver models like U4s and Fourte?

Along with the redesigned form factor and shell materials, Aspire 4 is our only four-driver model that is crossed over 3-ways (lows, mids, highs) as opposed to those other models that are 4-way crossovers. While Aspire 4 doesn't use our tia driver for the highs we developed a revolutionary waveguide to bring its highs to our incredibly high standards. It is also the only UIEM specifically designed and tuned for musicians and live-audio professionals as opposed to audiophiles and high-end audio enthusiasts.

What does "Hybrid" mean?

Hybrid refers to our use of multiple styles of drivers to achieve our desired sound. Aspire 4 combines the use of balanced armature drivers for the mids and highs and a single dynamic driver for the lows.

How does apex core differ from your patented apex tech?

Apex core, which is also used in Duo, achieves the same pressure relief using a different internal structure and material compared to our standard apex tech. Similar to some of our other UIEMs, Aspire 4's apex core tech is built in rather than an interchangeable module.

If I can't get a good fit with your tips, am I able to use third party tips?

Yes you can use any tips you'd like, the nozzle outer diameter is 5mm so that is the dimension you need to keep in mind when trying third party tips.

If the cable fails do I need to send the whole unit in for repair?

No, since the cable is detachable you can just buy a new cable from our website or any other cable that uses genuine estron IPX (or sometimes called T2) parts.

When I plug these in I have to turn the volume higher/lower than my previous set. Does that mean they're better/worse?

Since most IEM models have different "sensitivity" specs you will find that anytime you change your IEM model you might need to adjust your volume. It isn't necessarily an indication of quality or volume capacity.

Where is Aspire 4 made?

Aspire products are designed, packaged, QC'd by highly skilled technicians in the United States. Assembled in China using components sourced globally from trusted suppliers.