The APC SQ22 is a dual-channel audio isolation transformer specifically designed for professional sound systems, delivering complete electrical isolation and signal purification. This desktop audio isolator uses high-quality toroidal transformer technology to effectively eliminate ground loop noise and block electrical interference while preserving audio signal integrity and dynamic range. Each channel supports multiple audio formats including XLR, TRS, and RCA connections, with a flat, uncolored frequency response from 20Hz to 20kHz, providing clean, pure audio transmission for professional recording, live performance, and broadcast environments.

Unlike active electronic isolation circuits, the SQ22's passive transformer design requires no external power supply and operates completely noise-free, without introducing additional electronic noise or distortion. The compact chassis design makes it easy to transport and install, while the robust metal housing provides excellent electromagnetic shielding, making it the ideal solution for resolving ground loop issues in complex audio systems.