For mixing and mastering in stereo and atmos
immersive mixing headphones ollo audio s5x
immersive mixing headphones ollo audio s5x
immersive mixing headphones ollo audio s5x
immersive mixing headphones ollo audio s5x
immersive mixing headphones ollo audio s5x


  • Flat sound - Ready for mixing and mastering duties
  • 90 days trial period
  • Free shipping
  • In stock, ready to ship
  • Backordered, shipping soon

Regular price€539.00
Tax included.
  • Flat frequency response for best translation of spatial information (binaural effects and downmix) in atmos and stereo projects
  • 50mm dynamic driver at an angle in a fully wooden chassis
  • Fast-exchange earpads
  • Stainless spring steel headband
  • Detachable cable with an option for custom upgrades
  • Easy to drive - even with smart devices
  • Speaker, earpads, headband, strap, cable and backplates are all serviceable using home tools
  • 5 years limited warranty
  • Calibration includes
    • OLLO USC plugin
    • calibration data in xps file
    • compatibility with Realphones and Waves Nx
    • export to any 3rd party EQ
      Read more

Version: S5X 1.1

Download technical PDF

User manual S5X

Feature Specification
Speaker size 50mm
Frequency range* 15 Hz - 22 kHz sweep 1/3 oct p-p range (+/-1) 12 dBSPL
SPL/sensitivity* 106 dBSPL @ 1kHz RMS @ 0 dBu
Impedance ~50 ohm - smart devices ready
Ear pads diameter 95mm
Ear pads material Acoustic foam, extra elasticity poly leather and velour
Ear cups material American walnut
Headband material Stainless steel and nautical artificial leather
Cable termination Detachable 2 meters long Y 2.5mm mini jack
Connector 3.5mm jack with an adapter to 6.3mm jack
Weight 420 g (0.9 lb)
Magnet type Neodymium
Transducer type Dynamic
Coil 2 layered
Membrane material PET 25u
Speakers pairing Matched speakers*
International warranty 5-year limited warranty
Trial period 90 days from delivery date when purchased directly from OLLO Audio
*data capturing standard IEC 60318-1 sweep signal source, 100Hz-10kHz tolerance +/- 1dB, USC calibration disabled

We currently ship to EU, USA, UK, Canada, Australia, Switzerland, Norway, Mexico, Hong Kong, and Japan.

Import Duties:

  • Orders to USA and EU: no extra costs, duties or levies
  • Orders to countries outside the EU and USA: you will be refunded the EU VAT (22%) immediately after your purchase, as it will be paid locally when importing.

VAT Refund for EU B2B Companies:

  • Enter your registration number in the notes field during checkout, and we'll ensure your VAT is refunded accordingly. For any inquiries or assistance, please use our Help Desk.

Delivery Times:

  • standard shipping: 10-18 days.
  • DHL or FedEx Express: 2 days.
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flat Frequency
response target

tuned for best translation of HRTF spatialized information in your Atmos or stereo projects.

The S5X comes with a 2m long (6.5ft) detachable cable with a ball locking mechanism inside the plug. The enameled OFC core delivers original signal without audible harmonics or other distortion from any 6.3mm (1/4in) or 3.5mm (1/8in) TRS output.

Video with Padding
Made out of perforated artificial leather and velour to precisely control flow resistance around the earpads seal. This resolves into a smoother response through all frequency bands and also improves heat dispersion for long lasting comfort.
Video with Padding
The stainless steel headband features a replaceable artificial leather strap. With 360° earcup rotation and height adjustment sliders, it ensures a quick and perfect fit for any head size.
Video with Padding
  • Dynamic Neodymium speaker
  • 108dBSPL @ 0 dBu RMS 1KHz 30ohm output - that makes them work with smart devices too
  • Left / right matched speakers (+/-1dB SPL tolerance, sweep, range 100Hz-10kHz in the free field at 1cm distance)
  • 50mm diameter, PET 25u membrane
  • 50 Ohms, 2-layered coil
  • Replaceable using home tools
  • Earpads with outer diameter of 95mm (3.75in), an inner diameter of 57.5mm (2.25in) and a depth of a 20mm (0.8in), +/-2.55mm. Made of artificial leather and velour.
  • THD < 0.074% @ 1kHz @ 85dBSPL with sweep source measured with IEC 60318-1 ear simulator.
  • Variation in frequency response in band from 20Hz to 20kHz ~12 dB SPL using sweep and IEC 60318-1 ear simulator.
  • 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 an optimal sound stage for best translation of instrument positions in stereo or immersive formats.
  • Frequency response target for best translation of balance and artificially placed objects in stereo or downmixed (binaural) immersive projects.
  • Clamping force set to achieve target frequency response with industry-standard bitragional diameter of 14.3cm (KEMAR) on IEC60318-4 ear simulator.
  • Artificial leather strap and powder coated stainless spring steel are both replaceable using home tools.
  • 360 earcups rotation and sliders for quick and easy head size adjustments.
  • 2m long (6.5ft) and easy detachable silicone cable with enameled OFC core to ensure minimal signal distortion.
  • 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)

Calibration is the "final mile" in delivering perfectly flat frequency response. All our headphones are very well tuned out of the box and measured in quality control. By measuring every individual unit we can capture any deviations in sound quality that comes from material tolerances for a specific unit. Calibration fixes these and frequency response beyond what's possible with acoustic design alone.

Unit specific calibration can achieve an incredibly low tolerance of approximately ~1dB to the selected frequency target. For illustration purpose, generic software calibrations like Sonarworks Sound ID or Waves NX can only achieve about ~3dB.

Unit Specific Calibration (USC) includes a software plugin and a calibration data file. The plugin comes in AU, VST and AAX format for Mac and Win users. The calibration data file is in XPS format that enables manual import to any 3rd party EQ plugin or hardware.

Calibration includes:

  • OLLO USC plugin (AU, VST, AAX)
  • calibration data in XPS file
  • compatibility with Realphones and Waves Nx
  • export to any 3rd party EQ

Read more about individual calibration

They are my sonic reference point, my secret swiss army knife.

MATTEO MARCIANO | Anna Kendrick, Idina Menzel, Lang Lang, 2Cellos

"These headphones are such a pleasure to work on - natural, comfortable and true."

LEO ABRAHAMS | Lady Gaga, Adele, Florence and the Machine

"These are my favorite headphones."

GARY NOBLE | Amy Winehouse, Joss Stone, Jessie J, James Arthur

"the same feeling as if standing in front of your favourite speakers"

SEAN TALLMAN | Rihanna, Miley Cyrus, Usher

"they sound fantastic, are reliable and trustworthy."

MARC URSELLI | U2, Foo Fighters, Nick Cave, Lou Reed, Sting


Backed up with a 5-year limited warranty.


Sustainability at OLLO is not just about the environment. It's also about the relationships with suppliers, resellers and every customer.


All parts are exchangeable using home tools and available in the webstore.


Available on Amazon, Thomann, Gear4Music, Bax, Muziker and many local resellers


"These are the best studio and monitoring headphones I heard this year, and if you're exceptionally interested in studio work, they should be your top choice."


"The OLLO Audio S5X is an innovative headphone that should be seen as a tool for working professionals, audio engineers and producers needing a highly accurate monitor for spatial mixing."


"Surround mixing on headphones just got serious with OLLO Audio’s S5X."

09/10 Choice Award

We offer 90 days trial period on all our products. So you can take the time to test them out and make a decision. In case you wish to return them, you need to send them to us. We will refund your purchase but exclude any duties, levies and shipping back to us. For details reach out to our support.

You can purchase directly from us. Express delivery is usually in 2 days. We also have US based resellers and Amazon stores.

We have a list of resellers you can explore or buy directly from us. Most destinations are available. If your country is not on the shipping list in the checkout, please write to and we'll maually check for delivery options to your address.

At this time we do not have balanced option available. You can find some generic options on Amazon or similar stores. The tip for both channels is the positive.

We have service center in the USA, UK and the EU. Reach to support for details.

We believe in fair pricing all year long.⁠

⁠Free beats, gigs and mixes are all disrescpectful and are killing the industry.⁠ Everyone should be paid fairly and accordingly. So we do not offer discounts per se (not even on Black Friday and Cyber Monday) as we don't support that mentality.

We do lower the price when there is a good reason to do so. And we have three!


 B stock items are sonically exactly the same as A stock but with minor cosmetic imperfections. These are brand new, unused units. Limited offer to when such units are available!

Check availability here.


We’re aware that being at the beginning of your career can be hard. We have an offer to support all the audio-related students and teachers with a 25% discount on our headphones. To get this offer, please reach out to us with your student or teacher ID via this form, so we can verify eligibility and grant you a student status with us.


Our community is at the heart of everything we do. Engineers, creators and artists participate in the process of developing all of our products. If you work as a full-time audio engineer, musician, or in a similar audio-related profession and share the passion for pro-audio, you can apply to join. The endorsement community is the cornerstone for our R&D team. We take their feedback very seriously. Interested? You can apply here.

Wondering who's in the community?
Explore our community map

Yes. Here's the mdat file that can be opened with REW free software. Enjoy :)

While generic calibration softwares achieve about ~3dB tolerance from their respective target (likely Harman or similar), OLLO headphones are already acoustically flat within ~2dB to our studio headphones target.

That means they're more accurate to our target curve without any calibration enabled than they are with using generic plugins to "correct" them to their target curve.

Generic calibration means taking the average response of a few units and using that for any unit as the source data set. Imagine measuring a few generic rooms and apply their EQ settings to your room?! You'd never do that, of course not.

That's why they're limited to about ~3dB tolerance accuracy and can never achieve the level of precision of the USC calibration you get with us.

How do we achieve that? The USC eliminates any manufacturing tolerances and improves frequency response beyond acoustic limits for every specific unit. That's possible because we carefully measure every single unit in the quality control and can tailor calibration to that exact unit.

Generic calibration software solutions may offer so called individual calibration services, when you have to send your headphones to them to do what we do and pay a premium on it.

For example Sonarworks offers that service at 149 Euro + Shipping + Sound ID licence at 99 Euro = Close to 300 Euros.

With OLLO USC you get the individual calibration and USC licence included with our headphones or as an upgrade for older versions at 49 Euros flat!

For the geeks disecting every word:

~0.5 is an acceptable tolerance in all our official reports and claims. It excludes HRTF - KB500 by GRAS resonances as we do not correct anything with over 1.2 Q factor due to limits of earsimulators available on the market today that can result in bad sound quality due to mismatch between simulators' and final users' HRTF. We use multiple systems, earsimulators, sources and targets and always state exactly what's used somewhere close to any of our claims, charts or datasets. For example smoothing steps, source signals used, compensations used etc. Claims from our competitors are taken from their official and published materials or obtained in the lab with exactly specified (and published) scientific methods and tools. We use their brands or product names in pure comperative (fair use) reasons. They all create fantastic products.

Read more about individual calibration