The Bellos Audio X4 is our flagship model featuring 4 Drivers with 2 Balanced Armature Drivers for the Low/Mids and Highs, one 6mm Dynamic Driver to supplement the Sub Lows, and one Balanced Armature Driver for the Ultra-highs. All working together to offer a reference warm sound signature with a super smooth top end.

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SKU: X4-CIEM Category: Tags: ,


We are thrilled to unveil the X4, our flagship product from the X-Series line of Custom In-Ear Monitors. The X4 is the culmination of our dedication to delivering an exceptional audio experience to musicians and audiophiles alike. Featuring an added ultra-high driver and our proprietary In-Air Canal technology, the X4 delivers an unprecedented level of clarity, detail, and realism.

The X4’s tuning is finely crafted to deliver a reference warm sound signature that reveals every subtle detail of your music. The ultra-high driver provides an extended frequency response, delivering a very smooth and natural sound. The In-Air Canal technology enables the most comfortable CIEM listening experience. So comfortable it’s like having nothing in your ears! The X4’s are the best in class in ear monitors and are the perfect choice for anyone who demands the highest level of audio quality.

Like all X-Series, it comes with a host of additional proprietary technologies such as ATOM Venting which greatly expands the soundstage, beautiful 3D Printed Matte Shells, the ultra-durable RCX Cable Connector, Modular Drivers & Removable Faceplates for fast and easy service and repairs.


Additional information

CIEM Color

Matte Black, Matte Gray, Matte Green

Cable Color

Black, Clear

Cable Length

54", 64"

Packaging includes

X4 CIEMs, RCX Cable, Round Aluminum Case, IEM Cleaning Tool.