Puritan vs IsoTek vs inakustik

Puritan reduces noise by active filtering. With it though comes restricted current delivery and pinched dynamics. And no it’s not non current limiting. It puked when I connected my Pass Labs mono blocks to it and started ringing like your grandma’s old rotary phone.
 

The initial illusion of reduced noise floor by excessive filtering overwhelms all other effects and it takes time to realize that it does more harm than good. Live with it for a while then remove it completely and run everything direct. If you prefer the sound with puritan may be you have a very dirty AC line or your components power supplies are not up to snuff. None of my components benefited from it. Not even a DAC.
I couldn’t get rid of it fast enough. 

I use 2 Puritan PSM 156. One on each dedicated line. One on all front-end and source components. One one amps and subs. Been very positive for me.

I use the Puritan only for source components. My power amps always go directly to the wall, with a dedicated line to the panel.

I'm surprised by the negative comments I have read about the Puritan 156. I use a Puritan 156 Ultimate which is connected to a Core Power Technologies Deep=Core 1800 that is connected to my wall outlet. The results are outstanding.  All my components are connected to the Puritan 156, including my ASR Emitter 1 Exclusive amplifier which the manufacturer does not recommend be connected to a power conditioner. I have compared the performance with my ASR amplifier connected directly to my wall outlet versus having it connected to the Puritan 156. The improved performance when connected to the Puritan is undeniable - better resolution, soundstage, and bass, and no negative impact on  dynamics.