Farzad, many people complained that dynamics were reduced. In typical linear supply current is drawned in spikes of very high amplitude. Any filter element will cause a voltage drop, hence reduced dynamics. My conditioner Furman Elite PFI 20 has, in addition to filtering choke, a big capacitor able to supply high momentary currents. Not only that bass is sounding more even (more melodic) - I'm not sure why, but TV plugged into Furman has brighter and purer colors (reduction of jitter?). In addition my Furman has very tight non-sacrificial over/under voltage protection. Since the day I bought it we had few cases when bulbs suddenly got unusually bright and Furman switched OFF to switch ON automatically again when condition passed. I would never connect my gear directly to wall outlet.
