The Heil Sound Pro Set 3 are stereo studio headphones designed for recording, mixing, and monitoring applications across music production, podcasting, broadcasting, and amateur radio use. These professional wired over ear headphones feature a built-in phase reversal switch to support accurate phase detection and audio evaluation during critical listening. With a wide frequency response of 10Hz to 22kHz, they provide full spectrum audio monitoring suitable for tracking, editing, and playback tasks. The headphones include three detachable cable options—a 1.8m flexible straight cable, a 1.8m straight cable with 3.5mm plug for mobile devices, and a 3m coiled cable—allowing flexible connectivity across studio and portable setups. A twist-lock cable connection system helps maintain a secure attachment, while the included gold-plated 3.5mm to 6.3mm screw-on adapter supports compatibility with audio interfaces, mixers, amplifiers, and other professional and consumer audio equipment.