New Dedicated Line - Almost No improvement

@clearthinker those pre and phono amps used batteries build into the units or connected to a DC power inlet. That is different from using a cheap AC inverter running from batteries. I could word that differently. A cheap, high powered switch mode power supply.

The conversation has degraded to burning in AC power outlets. I think we have lost the plot on the conversation already. The op has not even verified there is a problem yet, but everyone is rushing to solve it without even knowing if there is a problem, or what it is.

This is what the inside of one of those low cost inverters looks like:  http://www.kerrywong.com/2017/10/01/teardown-and-testing-of-an-800w-puresine-inverter/  It is a high frequency switch mode power supply that generates the high voltage (~170V) and then a PWM stage, and then a filter. I don't see a lot of capacitors or filtering on the DC side, so there could be RF coming out. I don't see any FCC on most of these. YMMV

Old school ones with the big huge transformers are probably not as noisy.

I have battery storage device I tried on various components, prefer sound from dedicated lines and transformer based power conditioner. The cheap inverters in these devices is the problem, create their own noise/distortions. I assume those built specifically for audio, like the Stromtank have paid much attention to inverter produced noise.

It is this kind of audiophile sh-t that drives me nuts. All you have to do is buy equipment that has audiophile nut proof power supplies and you do not have to worry about anything except maybe lightening storms.

As for running components with battery supplies. I had NEW (Nirvana Electronic Works) DCA66 class a ss amp way back in 90's, early 2000's, ran off four wheelchair batteries, also have Merlin VSM-MM which has BAM that runs off 4 9V batteries.

Point is technology and implementation has been around for some time. Is it game changer? Based on my experience, no, and wouldn't you think audio manufacturers would have caught onto this if it was. Perhaps more battery storage devices with audiophile quality inverters will come to market in coming years, we'll see.

@theaudioamp Just pulling "isn't that against the code" out of thin air isn't helpful for anybody.  No, it is not against the code. There are a lot of 240 appliances that need outlets.  My home had 3 different 240 outlets for different appliances.  There are codes that govern the installation.

But you did hit on one of the big problems with battery systems--the cheap inverters they use.  The inverters for most commercial battery systems produce little more than a square wave.  They would be a huge step backwards.   One reason power regenerators are so expensive, the main reason, is that an inverter that makes a perfect sine wave is very expensive.  In fact, I don't know where to buy one except in an audio market power regenerator.

And I see mention of rhodium like it is the latest supermetal.  Shows how eager people are to jump on a buzzword.  Rhodium is a poor conductor of electricity and has no place in audiophile electronics.