Single channel isolator with extended low frequency response for pro audio subwoofers with balanced XLR inputs. The design begins with an extruded aluminum case that comes standard with gold plated XLR connectors. Plug and play easy to use, this passive interface does not require any power to work. Inside is a high performance Jensen transformer that is able to withstand signal levels to +18dBu at 20Hz without discernible distortion. This provides galvanic isolation between the input and output to eliminate hum and buzz caused by ground loops, while rejecting 60Hz noise by as much as 105dB.