Many years ago (before I was associated with AVA) when I purchased my first AVA amplifier Frank told me to plug it directly into the AC socket. I asked about power strips with surge protection and he told me that as long as the power strip can handle the current it would be fine, but again didn't think it was needed.
We have tried our amps with a power conditioner and didn't notice a difference in sound. AVA products use a traditional linear (transformer) power supply that is pretty robust and designed to handle real world situations.
We do sell a device, the Humdinger, to block DC that sometimes in on the AC mains. Having DC on the AC mains causes a mechanical transformer hum, and when the DC is removed the transformer hum is reduced or eliminated. Normally the mechanical hum isn't fed through to the audio circuit since it's a mechanical noise rather than an electrical noise. The Humdinger is a DC blocker and not a full blown power conditioner.
It's unlikely that a power conditioner will do any harm. It's possible there may be a slight change in sound, but it's not something I have heard.
If your concern is power surges and lightning strikes I recommend simply unplugging items you are concerned about when a thunder storm is near. I have a variety of radio equipment and during the storms I always disconnect my radios just in case
Larry