a used Topaz will cost $200 or so
none will do anything other than 'protect' from noise on the AC input from your utility, etc. and protect from power surges - noise generated by your own components needs to be solved via 1-3 below
1st you will want to makes sure your DAC and/or streamer, computer, file server is galvanically isolated from the rest of the system
2nd - hunt down and break all leakage loop currents in the system
3rd - use a star-quad type cable on your DC power supplies (wall warts)
4th is the isolation transformer
*** Good speakers, room treatments, and source recordings will be of primary importance, and ALL the above secondary ***
There is a 45 page long thread on ComputerAudiophile on how to do this and what to get (but you will need 2-3 days to wade thru it, and there is no summary AFAIK).
none will do anything other than 'protect' from noise on the AC input from your utility, etc. and protect from power surges - noise generated by your own components needs to be solved via 1-3 below
1st you will want to makes sure your DAC and/or streamer, computer, file server is galvanically isolated from the rest of the system
2nd - hunt down and break all leakage loop currents in the system
3rd - use a star-quad type cable on your DC power supplies (wall warts)
4th is the isolation transformer
*** Good speakers, room treatments, and source recordings will be of primary importance, and ALL the above secondary ***
There is a 45 page long thread on ComputerAudiophile on how to do this and what to get (but you will need 2-3 days to wade thru it, and there is no summary AFAIK).