The OLLO Audio S4R Recording Headphones are high-quality closed back studio headphones capable of being used in a mixing & mastering role. OLLO Audio are committed to making the finest studio headphones with a team of passionate musicians & expert engineers developing their products. The S4R excel as studio headphones as even though they feature a closed back they deliver a flat & unbiased frequency response & ultimate sonic accuracy. The speaker units consist of 55mm transducers with a PET 25u membrane & a double-layer coil system that deliver a flat & clear sound to your ears. The transducers require only 32 ohms making them relatively low impedance meaning they can work with a broad range of devices. Sound Seal Acoustics separates the front & back of the speaker cabinet which provides significant isolation & sonic performance. Built from Sturdy materials such as spring steel & wood the S4R is robust & comfortable. They feature poly leather & velour replaceable earpads with an acoustic foam interior that not only isolates outside & inside sounds but also provides ultimate comfort. The headband is constructed from powder-coated spring steel & features a self-adjusting strap it attaches to the earcups via two 360-degree rotational brackets. The S4R cable is a detachable braided silicone cable with an OFC core that ensures signal purity from your device to the headphones. This cable comes with left & right (L=black/R=red) colour coding on the inputs but they are reversible & can be attached to either PCB connector on each side. The cable also features a 3.5mm to 6.3mm adapter for connection capability to a wide range of devices.