OLLO Audio S4X 1.3 Calibrated (Open)

Without VAT: $404.14
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The OLLO Audio S4X 1.3 are calibrated studio reference-class, open-back, dynamic headphones with flat frequency response and units specific calibration plug-in, made in the EU. Their neutral and honest sound signature was perfected in close R&D collaboration with professional mixing and mastering engineers. The 1.3 version now includes USC calibration to push that even further.

Unit Specific Calibration file and plug-in are included with your purchase. With USC they are calibrated to ~1 dB tolerance to the respective target curve (spatial or stereo). The plug-in runs on PC and Mac with AU or VST3 supported DAW (Cubase, Reaper, Studio One, Ableton, Nuendo, Mixbus, etc.). You can also integrate USC directly with room emulations by Waves Audio and head tracking or run it in a daisy-chain. Available studios include Abbey Road, Ocean Way, Germano-Hit Factory and CLA Mix LA.


Benefits Of Individually Calibrated Pairs

With perfectly calibrated headphones you'll have an edge in mixing and mastering for best translation of your projects. You can expand your monitoring options with the Waves NX room emulations from Abbey Road, Ocean Way, Germano or CLA Mix L.A.


Matched Speakers

The speakers are matched in the lab in 100-unit batches using an automated process that has been perfected over the last 5 years of research. This process includes frequency domain analysis, which is more complete than just SPL analysis.



Front of the speaker cavity is sealed off from the back of the speaker. In principal it's similar to a closed guitar or bass speaker cabinet. This design produces a smoother frequency response and separation of low-end to the mid frequencies.


Silicone Cable

The cable is designed with an OFC core that delivers the original signal without harmonic or other audible distortion. The silicone finish makes it less microphonic than braided cables and easier to handle.


Custom Earpads

The earpads are directly responsible for the acoustic coupling impedance between the headphones and your ears and hence greatly affect the frequency response. They are a hybrid of velour padding on the area that touches your skin and artificial leather. This provides a smooth low-end reproduction with controlled flow resistance through velour coupling.


Self-adjusting Headband

The headband is made of stainless steel and is designed to withstand heavy usage. If necessary it can be replaced using home tools.


Built To Last

These are not made out of plastic. Headband is made out of stainless steel, wooden cups are CNC machined American walnut and the backplates are aluminum.

  • Hand-picked and left/right matched transducers delivering accuracy and instrument separation (±1 dB SPL tolerance, pink noise, range 100 Hz - 10 kHz in free field)
  • 50 mm, PET 25u membrane, 2-layered coil, 32 ohms
  • Dynamic Neodymium speaker with 109 dBSPL 1 V RMS @1 kHz 30 ohm output
  • Hybrid artificial leather and velour earpads to control flow resistance around the earpads seal resulting in smoother response in low mids and mids (150 Hz - 1 kHz) perceived as natural timbre on vocals, pianos, strings
  • Self-adjusting artificial leather strap
  • Detachable braided silicone cable employing OFC core to ensure minimal signal distortion
What's in the box?
  • OLLO Audio S4X 1.3 Calibrated (Open)
  • Removable cable with 3.5 mm jack / adapter 6.35 mm
  • Calibration Certificate
  • Headphone pocket
  • Keepdrum microfibre cloth
Style Over-ear
Headphones Type Wired
Open / Closed Open
Frequency Range 20 - 20 000 Hz
Impedance 32 Ω
Sensitivity 108dB
Headphone Features Detachable Cable
Weight 350 g
Color Black

Product instruction