The A-Series are custom in-ear monitors (IEMs), specifically made to the shape of your ear. The U-Series are universal-fit IEMs that fit to anyone's ear. They come with different sized ear tips to be able to fit ears that vary in size.

Why Custom?

For best fit and ultimate performance a custom in ear monitor is the only way to go. When you're performing on stage or working hour after hour in the studio, the last thing you want is having to deal with not perfectly working IEMs or a bad fit that causes distraction. And it's not only the practical side of things. Custom IEMs are made and tailored specifically to your ear and ear canal. This ensures an optimal performance in sound quality.

Demonstration To make sure you choose the right in ear monitor we offer a demo service. You'll have a chance to to hear every available model and choose which ever model suits you best. Please contact us at or +31638548126 to make an appointment.

Making impressions for your custom in ear monitors In order to get the best fit for your custom IEMs it's important to have good impressions made. For the Netherlands we have teamed up with Joosten Hoorspecialisten. They have proven to produce the best impressions time and time again. Of course you can have your own audiologist make the impressions, but make sure to show them the guidelines available in pdf here. Take some pictures as shown in the guidelines and sent them to us:

After we have approved the impressions, sent them to the following address:

Dune Blue B.V. Saturnusstraat 60, Unit 4 2516 AH, Den Haag The Netherlands

We will contact you about the design and customization and take care of everything else. You will be updated about the progress of production and delivery.

A-Series Customs



The A2e is the first in our award-winning line of custom in-ear monitors. Packed with two drivers and the latest technology, the A2e provides high-quality sound with a low profile look and extremely comfortable feel. It's the ideal monitor for emerging artists, bands, and anyone seeking an affordable IEM that outperforms generic universal-fit earphones.



Introducing the A3e, an extremely versatile IEM with impressive clarity and warmth for any instrument or genre. With its neutral and balanced tuning, the A3e delivers a surprisingly transparent and musical sound. Its 3-driver design possesses a spacious and detailed soundstage, making it a perfect match for vocalists, guitarists, keyboardists, and many other instruments.



The A4t is the entry point for anyone seeking the remarkable smoothness and extension of the tia™ technology. Built on the foundation of our successful 4-driver design, the new A4t delivers an immersive listening experience with a lively mid-range and powerful bass. Its sound signature is balanced and neutral, shining forth with a new level of clarity thanks to the tia driver and the tia single-bore that aids in removing unwanted resonance and distortion.



The A6t builds off of our exceptional 6-driver design that quickly became the “in-ear monitor of choice” for touring musicians and discerning music lovers. By integrating tia™ Technology we’ve done away with sound-altering tubes and dampers to deliver an incredibly smooth and musical frequency response to one of our most iconic sound signatures. Featuring a full and detailed sound that brings out the warmth and musicality in any live mix or recording, the A6t is ideal for musicians and audiophiles looking for added accuracy and resolution.



Introducing the “Nate”, an industry-first signature IEM by 64 Audio and Nathan East. The N8 stands apart from other custom-fit earphones due to its unique textures and rich, soulful sound. Produced in collaboration with Nathan East, the N8 represents Nathan’s superb musical taste as a bassist, singer, and producer. To achieve the necessary sound flavor, we opted for a hybrid design utilizing a 9mm dynamic driver for the lows and 8 balanced armature drivers for the mid range and highs. The result is an incredibly intimate and smooth sound with punchy lows, luscious mids, and a silky treble with an analog sensation.



The 64 AUDIO A12t Custom In-Ear Monitors are the ultimate monitors for professional stage, in the studio, and the most demanding audiophile applications; it features 4 low drivers, 6 mid drivers, and the incredibly smooth tia high and high-mid drivers. In the tia single-bore, sound from the low and mid drivers blends with amazingly-detailed highs from the proprietary open balanced armature tia high driver. The lower-mids have been refined while the familiar low-frequency response remains intact, providing the warm and inspiring sound of the A12 legacy. While there are other 12-driver products on the market, nothing comes close to the transparency, agility, and power of the A12t with tia technology.


Starting at €3200

The 64 Audio A18t is the world’s first custom-fit earphone with 18 balanced armature drivers per ear. It is the pinnacle of in-ear sound, designed for the most discerning listeners, audiophiles, and musicians who are searching for the ultimate reference sound. Pairing up a massive collection of 8 low drivers and 8 mid drivers with the tia™ high and high-mid drivers. The result is an incredibly tight low end, super transparent mids, remarkable high-frequency extension, and an out-of-this-world depth and soundstage. The A18t is designed with a combination of tia drivers and conventional drivers. Sound from the low and mid drivers combines in the tia single-bore and blends with amazingly-detailed highs from the proprietary open balanced armature tia high driver. We pushed the limits with innovation and design and are thrilled to finally drop this bomb on the in-ear monitor industry.