Ollo Audio S4X 1.3

FLAT OUT OF THE BOX...
...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.

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

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, 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.

ACOUSTICS
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™

HEADBAND
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

CABLE
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.
CALIBRATION PLUGIN USCUnit Specific Calibration plugin included. AU and VST3. Upgrading with the Waves NX room modelling and head tracking available.

WARRANTY5 years limited warranty (Earpads and cable are excluded due to the nature of exposure)