OLLO Audio S4X REFERENCE HEADPHONES 1.1

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Page last updated Mar 30, 2026

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Crafted for discerning audiophiles and professional sound engineers alike, the OLLO Audio S4X REFERENCE HEADPHONES 1.1 provide unparalleled audio accuracy for mixing and mastering. With their open-back design, these headphones offer a spacious soundstage that accurately reflects the artistic intent of any recording. Whether you're in the studio or enjoying a high-fidelity listening experience at home, the S4X delivers precise frequencies and natural, uncolored sound.

Designed and hand-assembled in Europe, the S4X prioritizes comfort alongside performance. The adjustable headband and plush ear cushions ensure hours of fatigue-free listening, allowing you to focus entirely on the nuances of your tracks. The detachable cable and durable construction mean these headphones are built to last, adapting to both studio and on-the-go environments.

Engineered with precision, the high-grade 50mm drivers provide a balanced sound signature that captures intricate details across the audio spectrum. This makes the S4X ideal for critical listening, offering clarity in the highs, a well-balanced midrange, and controlled lows that don't overwhelm your mix.

Whether you're a professional producer, a musician, or an audiophile looking for true sound reproduction, the OLLO Audio S4X Reference Headphones 1.1 is an essential tool in your audio arsenal.

Key Features:

High-fidelity open-back design for a natural soundstage
Hand-assembled in Europe for superior build quality
50mm drivers for detailed sound reproduction
Detachable cable for easy replacement and versatility
Comfortable headband and ear cushions for extended use
Ideal for mixing, mastering, and critical listening applications

Videos

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DMS

Ollo S4X Review

DMS

Ollo S4X Headphone Review - So this is what neutral sounds like!

Passion for Sound

Best Studio Headphones For Mixing OLLO Audio S4X Review & Unboxing

Mattias Holmgren

OLLO S4X Review - Handmade Reference headphones

Soundnews

Headphone Unboxing and Review - Ollo Audio S4x | GeeK TALK

Vaughn George

Mixing/Reference Headphones: Ollo S4X - Perfect Translation | GeeK Talk

Vaughn George

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Critic Reviews

Review: OLLO Audio S4X 1.1 Reference – Old-World Craftsmanship Meets Modern Science | Headphonesty

headphonesty.com

The OLLO Audio S4X Reference Headphones are a testament to craftsmanship and sound fidelity, delivering a neutral sound that pleases audiophiles and professionals alike. With outstanding build quality and comfort, they excel in long listening sessions. However, the open-back design may not suit everyone, particularly in noisy environments, and some users may find microphonics annoying. Despite these drawbacks, the S4X presents exceptional value for those seeking honest and transparent audio. A solid contender in the professional headphone market, OLLO's unique approach could elevate them among industry giants if only their marketing matched their impressive sound.

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