New Dedicated Line - Almost No improvement

In some cases things like a dedicated line ends up being more of an Insurance policy for best performance than otherwise and one might never accrue any concrete benefit. That appeals to many Audiophile types that are always on the lookout for whatever they think they might be missing.

The benefits of a dedicated line is more and cleaner power and current. How much that actually matters will vary case by case. Depending mainly on relative noise levels otherwise and does that even matter with the specific gear in play and how much current an amp must draw to function optimally. That’s about it.

Insurance policies may be beneficial for peace of mind alone if nothing else. YMMV.  Other than additional cost, a dedicated line done well should never hurt.

+1 @mijostyn

with unlimited product price target I can design power module for pre/amp/etc to take care of all possible AC power supply issues affecting SQ

If you need to add an additional breaker box make sure your dedicated lines (hopefully you will be adding one for your amp) are wired into the same box… otherwise this may cause a ground loop.  I’ll leave the details of wiring to others. Only, they make a difference… both.

On the spousal acceptance factor. This is definitely something to consider. Personally I would rather put my system in a small room that I control versus a big communal room. Treatments and careful choices can make a system sound amazing in a large closet… but a really expensive system can end up sounding not so good when placement is compromised and treatments (especially something like lots of windows) cannot be installed. 
 

Did you really think a dedicated line would make an improvement ?

Properly designed electronics INTERNALLY has all the necessary filters & mechanisms necessary to generate a good enough & acceptable DC.  Nothing external is needed.

The only requirement from the mains is that it is reasonably sinusoidal so the transformers work properly, and the voltage stays within a reasonable range.

Unless you are driving synchronous motors, even the frequency deviation does not matter so much, as long as the frequency does not drop below a number which causes the transformers to heat up.  Besides, not even the WORST mains supply in any country does not have fluctuating frequency to such a degree.

Inverter systems sound as different as anything.....here is one that will blow your mind.......incredible sound....everything you do makes a difference...even how an inverter is mounted.

http://tweakaudio.com/EVS-2/Inverter_Power.html