At a certain point in developing your system it ceases to be about what is 'necessary'.
I am a firm believer in the importance of the quality of the power that feeds our components - we start with an extremely small signal and amplify it using that power, so it could be argued that we are listening to that power supply. That's aside from noise and the environment issues in the air and from other components on the same circuit, which includes all the crap wall warts that power items that are not part of our system. Everything on a circuit forms part of that circuit.
I use an Ansuz Mainz8 C2 distributor and the difference it made to the sound quality was significant. I use matching power cables to the distributor from the wall and to my speakers (active, so I am talking about power cables to the amplification).
I will get another power cable for the wall to distributor connection (tempted to try Sablon Audio as I'd like to use a D2 to the distributor but that's a price that I'm not quite comfortable with) and then use the existing C2 power cable for my DAC. The DAVE seems quite sensitive to power quality and using a decent power cable to it provided a noticeable improvement. Or I might get a Sean Jacobs DC4 instead. I was quite surprised at the difference the power cable made to the DAVE. It seemed to make no difference to my streamer though, so I'll leave that with a standard power cable.
In my experience, quality power is the foundation of getting the best possible sound from your system.
But, to answer your question... no, it's not 'necessary'.
I am a firm believer in the importance of the quality of the power that feeds our components - we start with an extremely small signal and amplify it using that power, so it could be argued that we are listening to that power supply. That's aside from noise and the environment issues in the air and from other components on the same circuit, which includes all the crap wall warts that power items that are not part of our system. Everything on a circuit forms part of that circuit.
I use an Ansuz Mainz8 C2 distributor and the difference it made to the sound quality was significant. I use matching power cables to the distributor from the wall and to my speakers (active, so I am talking about power cables to the amplification).
I will get another power cable for the wall to distributor connection (tempted to try Sablon Audio as I'd like to use a D2 to the distributor but that's a price that I'm not quite comfortable with) and then use the existing C2 power cable for my DAC. The DAVE seems quite sensitive to power quality and using a decent power cable to it provided a noticeable improvement. Or I might get a Sean Jacobs DC4 instead. I was quite surprised at the difference the power cable made to the DAVE. It seemed to make no difference to my streamer though, so I'll leave that with a standard power cable.
In my experience, quality power is the foundation of getting the best possible sound from your system.
But, to answer your question... no, it's not 'necessary'.