U2, Beck, Rush, Kiss, Nikka Costa, Roxette, The Cure, John Cale, Spike Jonze, UCLA and Berklee.
"The HPS S4 respects all of the depth, width, air, tight bass, space and detail that I work so hard to create in a mix. I’ve compared them with the leading competitors and OLLO win!
Excellent reference headphones for mixing and mastering. Switching between the headphones and my speakers is effortless. And they are really light in weight and comfortable for long periods of use .... and they look cool too! Job well done!"