Reference-Grade Open Back Headphones
OLLO Audio - S5X
5 years limited warrantyOLLO Audio’s S5X are reference-grade, open back, dynamic headphones with a staggeringly flat frequency response, expertly engineered for binaural/immersive mixing made in the EU.
Although OLLO have targeted and recommend these for immersive mixing, they are an all round excellent pair of stereo mix phones, with an even frequency response and are incredibly easy to drive, get great results on any interface, even built in laptop headphone connectors. The build quality and design is excellent and ruggedised, they fold flat and come with a travel bag, making them ideal for hotel room and location mixes, so you don't have to take an extra amp with you. - Tom (Scan Pro Audio)
115 dBImpedance
108dBSPLSensitivity
5-YearsWarranty
Just Some Of Our Favourite Features!
Capture Frequency response in a certified studioUsing Kemar HATS simulator by G.R.A.S we captured frequency response of a Dolby Atmos certified studio. That was the base for the development of the prototypes that were then used in human subject A/B testing.
A/B human subject
testingWe all perceive spatial sound differently. The A/B testing with multiple mixing engineers gave us a more in depth understanding of what is required from headphones, to translate immersive mix, between binaural and speaker setup. We applied that knowledge as weights on the original target response.
Create a new target curve for headphones binaural mixingBased on our own research and plenty of articles in AES library we derived a final target curve for the immersive formats and we belive, for the future of audio. The new target curve is used as compensation in all our published reports.
OLLO S5X - If You Liked The S4X, You'll LOVE This For Mix Work!

At A Glance
SPEAKER
• 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.
ACOUSTICS
• 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
HEADBAND
• 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
CABLE
• 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)
WARRANTY
• 5 years limited warranty (Earpads and cable are excluded due to the nature of exposure)
The Tech Spec
| Features | Specification | Frequency response | 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 |
|---|---|
| SPL/sensitivity | @ 0 dBu RMS 1 kHz produces (+/-1) 108 dBSPL @ -23 dBu RMS 0.5-2kHz pink produces (+/-1) 85 dBSPL |
| Impedance | +/- 5% 50 Ohm, outboard audio interface recommended |
| Ear cups dimensions | Outer diameter: 95 mm |
| Ear cups material | American walnut |
| Headband | Stainless steel and artificial leather Clamping pressure N/cm² @14.3cm breadth ~0.127 N/cm² |
| Earpads size | Outer diameter: 95 mm Inner diameter: 57.5mm Depth: 20mm +/-2.5mm |
| Earpads material | Acoustic foam, extra elasticity poly leather and velour |
| Cable termination | Detachable 2 meters long Y 2.5mm mini jack |
| Connector | 3.5mm jack with an adapter to 6.3mm jack |
| Weight | 414g |
| Magnet type | Neodymium |
| Transducer type | Dynamic |
| Coil | 2 layered |
| Membrane material | PET 25u |
| Matched speakers | Handpicked pairs |
| Warranty | 5-year limited warranty |
| Trial period | 30 days from delivery date |