OLLO Audio S4R 1.3 Calibrated (Closed)

Without VAT: $377.14
Delivery by request
Remote warehouse: 1 pcs. available (delivery in 14-20 business days).
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Your recording headphones are the first touch with your performance. All the details must be preserved and nothing should be exaggerated. That's what the S4R are all about. Now further improved with USC calibration in 1.3 version. Studio recording class closed-back, dynamic headphones with enhanced clarity 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.
  • 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
What's in the box?
  • OLLO Audio S4R 1.3 Calibrated (Closed)
  • Cable
  • 6.3 mm adapter
  • Individual measurement graph
  • Carrying pouch
  • Owner's manual
Style Over-ear
Headphones Type Wired
Open / Closed Closed
Frequency Range 20 - 20 000 Hz
Impedance 32 Ω
Sensitivity 111dB
Headphone Features Detachable Cable
Weight 382 g

Product instruction