Ollo Audio S5X 1.0 Reference Headphones for Binaural and Immersive Mixing

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Designed and optimised for binaural mix translation between headphones and speaker setup.

Reference class, open back, dynamic headphones with flat frequency response for binaural/immersive mixing made in the EU.


*Most studios do not have a truly flat frequency response. They have modal dips and peaks that even software can't even out.

The S5X fixes this with room independence and flat tuning, allowing your monitoring to rival the flattest studios in the world.

Trusted by professionals working with Adele, U2, Ed Sheeran, SIA, Rihanna, Sting, Foo Fighters, Beyonce, etc.


  • Hand picked and left / right matched transducers delivering accuracy and instrument separation. (+/-1dB SPL tolerance, pink noise, range 100Hz-10kHz in free field*)
  • 50 mm, PET 25u membrane, 2 layered coil, 50 ohms,
  • Dynamic Neodymium speaker with 108dBSPL @ 0 dBu RMS 1KHz 30ohm output that makes them work with smart devices too.
  • Replaceable using home tools.


  • Replaceable earpads with outer diameter of 95 mm(3.75inch), inner diameter of 57.5mm(2.25inch) and depth of 20mm(0.8inch), +/-2.55mm.
  • Perforated hybrid artificial leather and velour earpads to control flow resistance around the earpads seal resulting in smoother response through all frequency bands and improved heat dispersion.
  • 1kHz @ 85dBSPL sweep THD < 0.074%, Variation in frequency response in band from 20Hz to 20kHz ~12 dB SPL* pink noise.
  • Front to back air pressure equalization controlled with Saati flow resistor 3.2Ohms(²)/1cm²
  • Ex-centric and angled speaker in a conical radiation chassis with optimal sound stage for the spatialization of objects in binaural renderer
  • Frequency response tuned for translation of immersive mix between binaural and speaker setup


  • Artificial leather strap
  • Clamping force set for target frequency response on industry standard bitragional diameter of 14.3cm (KEMAR)
  • Stainless spring steel with powder coating
  • 360 earcups rotation with sliders for head size adjustements
  • Strap and steel headband are replaceable using home tools


  • Detachable braided silicone cable employing OFC core to ensure minimal signal distortion.
  • Color labeled L and R jacks (Left is Black)
  • Ball-locking mechanics on the embedded 2.5mm jack plugs
  • Screw on adapter from 3.5mm to 6.3mm jacks (1/8 to 1/4 inch)

5 years limited warranty (Earpads and cable are excluded due to the nature of exposure)

S5X Technical details

Frequency range
15 Hz - 22 kHz sweep 1/3 oct p-p range (+/-1) 14.5 dBSPL
20 Hz - 20 kHz sweep 1/3 oct p-p range (+/-1) 12 dBSPL 

@ 0 dBu RMS 1 kHz produces (+/-1) 108 dBSPL
@ -23 dBu RMS 0.5-2kHz pink produces (+/-1) 85 dBSPL

Earpads in/out diameter / depth
+/- 2.5mm 57.5mm / 95mm / 20mm

Clamping pressure N/cm²
@14.3cm breadth ~0.127 N/cm²

+/- 5% 50 Ohm


Customer Reviews

Based on 1 review
Frank Sullivan
Ollo Audio S5X, Amazing headphones

Very neutral to my ears with incredible dynamics and detail. I have around a dozen headphones, several headphone amps and dacs, I’m retired so spend a lot of time listening to music. For a start, I like unusual looking headphones and the Ollo are that, reasonably comfortable but people with big ears might have a bit of a problem as the earpads are round and internal diameter maybe a touch small but on the whole I find them 8/10 for comfort. I would call them musical but quite detailed and very dynamic. Bass is powerful but not overpowering in any way. I don’t normally listen to playlists but I happened on a qobuz playlist with on of the songs being an original movie picture soundtrack, Blindness, Trilobita solo 2 Uakiti. This track alone demonstrated very clearly the dynamics that none of my other headphones could match. These headphones are unforgiving of bad recordings but on well recorded music they are exceptional.