London based producer, DJ, and promoter from Poland specialising in electronic music | founder of Openview Records
"S4 by Ollo Audio present brutally honest response to what is actually going on in my projects. S4 are by far the flattest and truest headphone reference I have come across. That is simply what I need to make crucial decisions during mixing and finalizing sound. S4 studio headphones are in fact, beautifully crafted tool!”
OLLO vs. Sennheiser vs. Audeze vs. AKG vs. Beyerdynamics vs. Audio Technica
We measured and compare the frequency responses of the main mixing headphones on the market. Measurements were made using G.R.A.S 45CC using IEC 60318-1 ear simulator and Dewesoft AD conversion Sirius system.