OLLO Audio S4X 1.3 Calibrated (Open)
OLLO Audio S4X 1.3 Calibrated (Open)

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Description
Description
OLLO Audio S4X 1.3 – Calibrated Open-Back Studio Headphones
The S4X 1.3 delivers ultra-accurate monitoring with a flat, studio-reference tuning perfected in collaboration with professional mixing and mastering engineers. It adds Unit-Specific Calibration (USC) for finer accuracy, all wrapped in a refined, open-back design that’s built to last.
Key Features
- Flat response with USC calibration: Each pair includes a calibration plugin (AU/VST3) that refines the frequency response to ±1 dB tolerance for consistent mix translation.
- Studio reference accuracy: Hand-matched 50 mm dynamic drivers with ±1 dB matching ensure precision and consistency across units.
- Open-back design: Offers a natural, spacious soundstage—ideal for mixing, mastering, and critical listening.
- Premium fit and materials: CNC-machined walnut earcups, replaceable hybrid velour/leather pads, stainless-steel spring-headband, and SoundSeal acoustic separation.
- Detachable cable: OFC-core braided silicone cable with 2.5 mm locking connector; reversible plug orientation suit both desktop and instrument work.
- Built to last: Durable build with replaceable parts ensures longevity and sustainability.
Customer Benefits
From podcasting to polished stereo mixes, the S4X 1.3 gives you confidence that your work will sound consistent across systems. It’s precisely tuned, thoughtfully constructed, and made to endure long, demanding sessions.
Quick Specs
- Driver: 50 mm dynamic, PET 25 μm membrane, dual-layer coil
- Impedance: 32 Ω
- Sensitivity: ~108 dB SPL
- Frequency Response: 20 Hz – 20 kHz
- Cable: Detachable OFC-core braided silicone, reversible orientation
- Earpads: Hybrid velour and artificial leather, replaceable
- Headband: Self-adjusting stainless-steel spring design
- Calibration: USC plugin (flat response targeting), unit-matched drivers
- Construction: CNC walnut cups, aluminum grilles, robust build
What’s in the Box
- OLLO Audio S4X 1.3 headphones
- Detachable cable (with reversible plug orientation)
- Quick start guide
- Calibration certificate and USC plugin
- Carrying pouch
Use Cases / Ideal For
Perfect for audio professionals needing an honest-sounding, mix-translating headphone. Whether editing podcasts, mixing tracks, or finalising masters, the S4X 1.3 offers reliability and precision in a compact, durable package.
Pros & Cons
✅ Pros:
- Exceptionally flat, calibrated response ensures faithful monitoring
- Open design with wide soundstage—great for immersive spatial awareness
- High-quality materials and replaceable components for longevity
- USC plugin integration allows precise tonal control within your DAW
⚠️ Cons:
- Open-back design provides minimal isolation—best suited for quiet environments
- Calibration workflow may add complexity for casual users
The OLLO Audio S4X 1.3 blends professional-grade calibration with refined craftsmanship—made for creators who demand accuracy and durability in their reference tools.