"I´ve used OLLO S4 and S4R headphones for over six months now and they have become indispensable in all stages of my recording process: tracking, mixing and mastering. I´m a Finnish recording engineer and musician and I do a fair amount of recording with my mobile studio in places where monitoring acoustics are sometimes challenging. I also record myself for my own and other people´s projects and I have to use headphones a lot for various recording decisions, microphone choices and placement etc. In the photo I´m making a test recording for an upcoming project with my recently purchased 1967 Gibson J-50 and two Neumann KM-84 microphones.
In all recording situations I´ve had no surprises when switching from OLLO S4R to good monitor speakers (I use Lipinski, Neumann and Genelec for different things). I also do the final critical quality control of my mastering work with OLLOs. The stereo image and the balance between bass, middle and treble are the best I´ve heard in any headphone and the middle is so smooth and uncolored I can actually fine tune my mastering eq with them.
I built a little flight case for my OLLOs and I take them everywhere when I need to use headphones for recording or critical listening (but they are actually a lot of fun for casual listening as well!).
As a portable studio quality listening environment these are hard to beat."
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.