Environmental Potentials EP-2750 Ground filters are inserted in series between your circuit's safety ground, and the ground bus on your breaker panel. The EP-2750 provides further isolation of your dedicated stereo or HT circuits from the rest of your home, and may be used with any worldwide voltage, in a residential application.
These two are available due to system changes. As new, no unusual electrical events while installed.
New at $216, a great way to experiment or add to your EP installation.