I just plug the filter Yaqin ML 1100, I bought it but was really not sure of the efficacity.
My system is composed of CD player Marantz CD 5400 + DAC Cambridge + preamp NAD on 1 NAD 216 THX connected to JBL 4312 ,another NAD 216 THX with MAGNEPAN and one YAMAHA M 60 connected with BOSE 901 and equalizer Bose. With the 3 systems the sound seams to be more dynamic and clear, the bass are dry. I'm very surprised of the result. I could not expect this. I highly recommend this yaqin ML 1100.