The Iso-Max SUB-2XX is a two channel low-frequency isolator created specifically for sub-woofers to eliminate hum and buzz caused by ground loops in balanced audio systems. The design begins with a rugged flanged enclosure that comes standard with gold plated XLRs and a removable screw-down barrier strip for easy installation in a NEMA enclosure. Plug and play easy to use, this passive interface does not require any power to work. Inside are two specially designed Jensen audio transformers with extended subsonic response to deliver powerful and articulated bass for maximum impact. Even when being subjected to extremes, the SUB-2XX is able to gracefully handle low frequencies down to 20Hz with less than 0.01% distortion and less than 1dB of phase shift. To further optimize the performance, a bottom mounted 8 position ‘set and forget’ dip switch enables the user to configure the SUB-2XX grounding scheme as needed. And with better than 100dB of common mode noise rejection, you can enjoy the full performance of your audio system without noise.