Ollo Audio HPS S4X Headphone

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If you want to experience music as it was intended, this Ollo Audio headset is what you are looking for as it sounds pure, wide, transparent and natural.

The special feature of this headset is that it works without correction software (DSP), sophisticated electronics and DA conversions.

Finally these fully hand-built headphones from Ollo Audio are made from high-quality and environmentally conscious materials.


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  • 14 days return and refund policy. 14 days return and refund policy.
  • Free shipping in service point as from 250€ Free shipping in service point as from 250€
The new Ollo Audio HPS S4X Reference goes a step further.

This new Ollo Audio HPS S4X headset is based on the existing HPS S4 but with upgrades that were put forward by the OLLO community.

So not just an upgrade but with the points that matter…

Frequency response

An even flatter frequency response than the HPS S4.

New earpads

The pads are custom designed and the opening is slightly enlarged.

This means they fit better around the ears and have enough padding to comfortably rest against your ears, so even more comfort than before.

The earpads are 90mm and consist of velvet, artificial leather and memory foam.

High precision woven mesh

Designed and manufactured to improve acoustics and protect sensitive components.

  • Smooth monofilament fiber
  • Efficient protection from dust
  • Strict airflow control
Matched speakers

All speakers in each series are selected and matched to achieve the smallest possible tolerance between the left and right channels.

They are made of Neodymium with a 2 layer spiral and a 25h PET membrane

New headband design

The headband has been redesigned to eliminate resonance when touched.

Durability and strenght of stainless steel joined with luxury and elegance of the nautical leather for maximum comfort

“Pure out of the box”

The new Ollo Audio S4X HPS is built entirely by hand and is composed of high quality environmentally friendly materials.

As with the HPS S4 and S4R, it works without correction software (DSP), complicated electronics and DA conversions.

Due to the even flatter frequency response, it sounds pleasantly pure, which is extremely pleasant if you want to experience music as intended.

Lively, wide, transparent and natural.

The audio quality is achieved with the aid of acoustic compounds, such as also commonly used in the better speakers.

This allows you to enjoy all the nuances in music.

Premium build quality

The HPS S4X headphones are built with luxurious but environmentally friendly materials (made in Europe) and thanks to the renewed headband, it radiates even more class and durability.

Because the opening of the earpads has been slightly enlarged and is made of acoustic foam and extra elastic artificial leather, the wearing comfort has become even better.

Listening to long music sessions is extremely pleasant, without tiring or irritating.

Technical specifications

Speaker size: 50mm open back design

Frequency range: 20-22kHz flat response design

SPL: 108dB hearing threshold @1kHz

Impedance: 32ohm

Ear cups outer diameter: 90mm

Ear cups inner diameter: 70mm

Ear cups material: American walnut

Headband material: Stainless steel and nautics leather

Ear pads size: 90mm

Ear pads 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 adapter to 6.3mm jack

Servicable: Every part of HPS S4X is replacable with home too

Weight: 350g

Magnet type: Neodymium

Transducer type: Dynamic

Coil: 2 layered

Membrane material: PET 25u

Matched speakers: Handpicked pairs

Warranty: 5 years limited warranty

Ollo Audio

Specific References

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