For an interesting and detailed review of the ENO filter by Hans Beekhuysen on his You Tube channel see here

Although he says that Network Acoustics recommend the use of the filter placed after a switch he does not appear to try this configuration himself other than with the Uptone EtherRegen. Nonetheless many should find his review very helpful.

Last edited by Asa Post; 2021-04-10 08:44. Reason: clarification
Asa Post