S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing
S4X 1.3 mixing and producing

S4X 1.3 mixing and producing

Regular price€449.00
Tax included.

  • Flat sound
  • Available on Amazon
  • In stock, ready to ship
  • Inventory on the way

*BREXIT - We're VAT registered in GB so purchasing from us is the same as purchasing locally. No import duties. Enter your VAT in the cart notes if you're a business.

** CA, AUS, CH, NO, MX, HK, SP, JP, etc will have import duties. We will refund EU VAT (22%) immediately after your purchase as you'll pay it locally when importing.

*** USA & EU - There's no import duties.

**** B2B EU companies - we'll refund your VAT, just enter the registration number in the notes field when you're in the cart. For any questions, please use our Help Desk.

DHL or FedEx Express deliveris usually in 2 days

Unit Specific Calibration file and plugin are included with your purchase. With USC they are calibrated to ~1dB tolerance to the respective target curve (spatial or stereo). The plugin 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.

To learn more about the calibration, click here.

calibration for studio headphones


...is the phrase reviewers coined for the S4X. Their neutral and honest sound signature was perfected in close R&D collaboration with professional mixing and mastering engineers. The new 1.3 version now includes USC calibration to push that even further.

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..



A professional sound design buddy recommended the S4X’s after I said I was saving up for Audeze’s.
He said they were equal in sound quality with a more moderate price and a lot lighter.
I’m already trusting them more than my main monitors for final mixdown and mastering duties…and than is saying something.
I have a professionally treated room with a calibrated Neumann setup.


Artist and creator of Kalya Scintilla, Merkaba, Sonic Samadhi


"I love the depth and clarity I get in my mixes with the S4x. Especially in the kick and snare which is often so hard to get a punch in headphones that will translate to a speaker. But more then anything, they really make it fun to listen to music for a long period of time!"

John Escobar - OLLO Audio Ambassador
John Escobar

Independent Producer/engineer, Professor - Berklee College Of Music


"I never used headphones to make my mixes, except to check for any noise that was causing me problems. Thanks to their excellent work I can mix without compromise even in the living room. Ollo Audio puts in the reference headphones the same care that I put in my work. "


Lana Del Rey, Tiziano Ferro, Emma Marrone, Pfm, etc


"The separation between the instruments, the dynamics and stereo image are perfect to be comfortable mixing with them.

I was amazed by the S4. But I am floored by the new S4X reference headphones.

Just amazing!"


Mick Jagger, Nicki Minaj, Will.I.Am.


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.


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.

Studio headphones HPS S4X 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.


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

S4X series stainless steel headband kit

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 aluminium.

Studio reference class, open back, dynamic headphones with flat frequency response and USC calibration, made in the EU.


  • 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, 32 ohms,
  • Dynamic Neodymium speaker with 109dBSPL (S4X) / 111dBSPL (S4R) 1Vrms@1KHz 30ohm output that makes them work with smart devices too.
  • Replaceable using home tools.


  • Replaceable earpads with an outer diameter of 90 mm(3.5inch), an inner diameter of 55mm(2.2inch) and a depth of 20mm(0.8inch).
  • Hybrid artificial leather and velour earpads to control flow resistance around the earpads seal resulting in smoother response in low mids and mids (150Hz-1kHz) perceived as natural timbre on vocals, pianos, strings,...
  • 1kHz @ 85dBSPL sweep THD < 0.084%S4X / 0.079%S4R , Variation in frequency response in band from 20Hz to 20kHz ~13,7 dB SPL S4X / 10,0dB SPL S4R, pink noise IEC 60318-1 compatible standard.
  • Fully separated front and back of the speaker for minimal phase cancellation and a more direct sound signature. SoundSeal™


  • Self-adjusting artificial leather strap
  • Clamping force set for most neutral frequency response on industry-standard bitragional diameter of 14.3cm (KEMAR)
  • Stainless spring steel powder coated
  • 360 earcups rotation
  • Strap and steel are replaceable using home tools


  • Detachable braided silicone cable employing OFC core to ensure minimal signal distortion.
  • Colour labelled L and R (Left is Black)
  • Reversible to have the cable coming down behind your back when playing an instrument or in front when producing with a desktop interface.

Unit Specific Calibration plugin included. AU and VST3. Upgrading with the Waves NX room modelling and head tracking available.

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

Explore how the S5X, S4X/R compare to the other popular studio headphones in a full report including IEC 60318-1 & 4 ear simulator standards.

Download PDF

We believe in fair pricing all year long.⁠
⁠Free beats, underpaid gigs, free mixes are all disrescpectful and are killing the industry.⁠ So we do not offer discounts per se (not even on Black Friday and Cyber Monday).

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 scratches on backplates or headband. Some are built from wood leftovers. As mentioned, sonically, they perform exactly the same, only cosmetics are not perfect.

Check availability here.

* Limited offer until the supply runs out!


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


Our community is at heart of everything we do. Our ambassadors actively participated in the process of developing all of our products and are the reason we are where we are. The feedback and the passion of our endorsers is a fuel that gets us going and it kind of feels like a second family.

If you work as a full-time audio engineer, musician, or in a similar audio-related profession and share our passion for pro audio gear, you can apply to become our endorser. You can get more info on endorsement program and apply here.

Explore our community map:



OLLO Audio ltd offers a 5-year limited warranty to the S4 and S5 series of headphones. For the first two years, OLLO Audio provides a full warranty where the only exceptions are the cable and the ear pads. We cover all the costs of repair and shipping costs both ways. Excluded are custom duties. Depending on your location, there might be a way to void these as well. For the subsequent years, OLLO Audio offers a limited warranty, covering repair costs (cable and earpads are not included) and excluding shipping costs both ways.


Read more about 5-year limited warranty in OLLO Audio Manual.



Fill out the form with Help Desk. Get your invoices ready. After you submit a claim, we'll contact you with further information. Typically we'll respond in 48 hrs. We will generally order a DHL pick up at the address of your choice and inspect the headphones in our lab. After the headphones are fixed, we will ship them back to you with regular posts. In case you need your headphones back faster, you can contact us at info@olloaudio.com to order DHL express shipping (costs 24,90€). 



In the trial period of 90 days, we offer a full purchase refund. The process is explained in detail here.



Mobile: 00386 69 712 841

Email: info@olloaudio.com

S4X 1.3 version is acoustically identical to the 1.2 version but with the USC calibration plugin included. This improves their flat frequency response from ~2dB down to ~1dB tolerance using DSP.

S4X 1.0 has female jacks mounted on the panel with a straight down cable position. S4X 1.1 has an angled cable position that enables front and back cable position depending on the use case. They are “flippable”. S4X 1.2 is the same as 1.1 but with embedded connectors for greater durability.

Regarding S4X vs S5X tuning, the S4X are slightly darker sounding and warm. They represent how a common room will sound. That, together with acoustics properties, makes them a staple in over 10,000 studios worldwide for mixing and producing in stereo. The S5X are specifically tuned for spatial audio mixing with a brighter character that helps with 360 positioning and movements of 3D binauralised audio (e.g., Dolby Atmos). Both are tuned flat for their purpose. It’s not one target frequency response curve that fits all use cases.

Regarding S4X vs S4R tuning, the S4X is more laid back in comparison to S4R tuning that is made with clarity in mind. That is to deliver accurate monitoring for recording and podcasting sessions. Mids forward tuning is welcomed in monitoring for details and dynamics. Both of these are crucial when you’re recording instruments or vocals at the highest level.

E-mail: support@olloaudio.com

Phone: 00386 69 712 841 (Whatsapp supported)




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

Check the list


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.

Yes. They are 30ohm impedance, so they will play loud with smart devices and laptops too.

No. Upgrades are only possible within the series. For example from S4X 1.0 to 1.1. Also limited to EU markets.

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 support@olloaudio.com 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.

Recording and podcasting?

Learn about the closed back version - S4R