Power Conditioners

First thing, do you have any issues with your system? I forgot to ask.

Second get a multi meter, if you don't have one, STOP.. Don't get hurt, get some help.
DO NOT work on hot circuits, no multi-meter, NO WORK!!! i
If you do know what your doing, are comfortable, and NOT COLOR blind, (I ran into that to :-) )

White = neutral
Black = hot
Green = ground
Bare = ground
red = aux/hot/jumper/assignable

Phase? reverse the black and the white, when there is no ground?
or is it direction on the cable?

These are questions for you, don’t mix them up, yes direction matters.
Cables, normally work better in one position or direction, unless they are already set up that way. Male, female as an example.

OR Don’t use a wall wart, and use a good SURGE suppressor and a maintainer. It’s not a SQ issue FIRST for me, It’s a safety first, protection second. BUT SQ won’t suffer, with good Equipment and protection.
Let it settle for a while, rout your cables correctly...Get them off the floor.
It’s your equipment, I protect my expensive equipment, plane and simple.

Regards

Thanks for your post @oldhvymec but I have a hard time understanding what you mean to say :-D

What I try to accomplish with my system is better SQ, less noise. I’ve had a filter before and it helped a lot. Now I want to buy a new one and I want to set it up as correctly as I can. So everything in the correct group and all devices in phase. With the regular power cables it’s easy to put it in phase but the wallwarts and power cables without grounding it’s hard.

You do NOT need them, unless you live somewhere with a lot of lightning strikes. Other than that, there is no need. The filtering in the PSU of your devices are more than adequate. The rest is mostly snake oil or the improvement is so insignificant, it is not worth the expense.

If you have hum or noise issues, they are typically due to other reasons.  Those typically occur when you connect 3 pronged (with an earth connection) plugs to DIFFERENT outlets.  The miniscule potential difference which exists between the different earth points are what causes hum issues (earth loop).  Make sure that ALL your 3 pronged plugs connect to the SAME outlet, making a star connection.

Bull pucky. It's not snake oil, no matter how often someone gets up on their soapbox and yells at passerbys.

 I've measured the AC over the course of many days, all day long and it never varied more than +/-2 volts.

No lightning strikes here either.  All gear is built to a price point and based on tech from many decades ago. I thought everything was hunky dory until I got my Niagara 1200. It was no contest concerning the difference.

To infer that all equipment out there is improperly designed and built i(if you end up hearing a difference) s silly and misleading.

Here, read this from John Atkinson of Stereophile (the king of measurements and always quoted by the naysayers as some kind of justification to rely on measurements only)
https://www.stereophile.com/content/spectral-x-contamination-problems-op-amp-chips

The article is about op-amp chips but goes into some depth on the lack of proper measurements and the equipment needed for them. Small things have a very large effect.

All the best,
Nonoise

again. Snake oil. 99% of electronics will already rectify/filter 99% of the noise out of the PSU dc lines reducing down to a miniscule ripple. You will not hear any difference.

İf you are hearing a difference, you must live somewhere where your power company should be taken to court for not being able to provide even the basic service.