Paul S wrote:

Every case of a "dedicated ground" I have seen, including my own, involves only the redundant "ground" wire. The "ground" wire may not be useful for every component, and it can actually introduce noise in some cases.

drdna wrote :

"...What was more concerning is today some 60 Hz hum also re-emerged in the system... As everything is plugged into the PP2000, I am not sure how to deal with it..."

Before opening up AC outlets and breaker boxes, here's a way of disconnecting the "ground" wire, and doing a quick test.

This is one of the big old power cords from PS Audio, which used to have a nice feature allowing a quick disconnect of the "ground" wire.

Unplugging the connector disconnects the cable and whatever component it supplies from "ground". You can then of course connect a test cable at one end to that same connector, and at the other end to the nearest water or drain pipe.

If you are even remotely capable with a pair of wire strippers and a soldering iron, its a very simple matter to make a test cable with this same feature. Just modify one of the common cheapo power cords that come with most audio components (you can also buy them at computer supply shops, as they are used for the power supply of computers). Use one with the fattest section you can find.

In your case, because everything is going through the PP2000, you have only one AC outlet to consider ; the one supplying the PP2000.

BTW, here's the way PS Audio now do it... Looks a lot more slick, but not as handy for connecting to the nearest water pipe :



Best of luck.

jd*

I should add that disconnecting the "ground" wire as mentioned above will most likely not solve the issue.

It will likely also be necessary to ground the chassis of the components directly (to a nearby water pipe for example).

When grounding the chassis of components, consider also the issue of balanced and unbalanced interconnects.

In the case of unbalanced, find out if the sleeve is carrying chassis ground (use an Ohm meter). If I understand correctly the sleeve typically carries chassis ground.

For this reason, the manufacturer of the amps I use recommends using interconnects that have the connection to the sleeve/shield disconnected at one end... Which would mean tossing out the precious audiophile-approved interconnects, and making my own. Using such an interconnect would allow connecting each chassis directly to a grounding rod.

jd*

Just to be clear : If chassis ground is carried by the interconnect from chassis to chassis, then ground only one chassis.

(Romy, it would be great if we could edit our posts).

jd*

drdna wrote:

What was more concerning is today some 60 Hz hum also re-emerged in the system, sounding like a vibrating cell phone going off in the back of the room. It was interesting how it was sort of localizable, but the hum is annoying. As everything is plugged into the PP2000, I am not sure how to deal with it.

I am a bit concern with word “re-emerged” in your comment.  Are you saying that your playback did not have the hum with PP2000 initially in place and then as the PP2000 was burning the hum re-appeared.  Are you sure that you did not change the connections and the layout of the loads the coursed the hum?

I see highly unlikely that PP2000 is the reason of hum. The only thing that I would advise to check with PP2000 is that it shell not run DC in out that will course not only hum via speakers but also mechanical buzz in your magnetics. The Pure Power for only god know reason did not put in their units a very simplistic automated DC offsetting circuit, so you need to do it manually if you have DC running out of the unit, thanks God Pure Power offers a manual adjustment for it.

Regardless the rest I think you have a normal ground loop somewhere and it might be cured by normal PP2000-independat ways. The PP2000 own power cord must be plugged into 3 pin power receptacle and the ground terminal of the PP2000 into cable much not be lifted. However, feel free to lift the outputs of the PP2000 as much as you wish as long it benefits your specific need. I would advise to do I did what I was playing with PP2000. Plug all system in a big power strip/s and then plug the strip into whatever comes to your head: the wall, instillation transformers, PowerPlants, Sola transformers, AC SS stabilizers, resonating stabilizers… you name it. In this situation you can easy to use just one cheating plug to lift ground on the whole system and to see how it affects the things.

One more tip. I was fighting with this year back and it took for me for a while to figure it out. If you use any DWA to play files of computer and employ KVM switch to run one monitor/mouth/keyboard for multiple machines then be advised that KVM switch is a pack from playback’s “clean” ground to the ground where you PS connected to the utility lines. I was forced to lift the ground on all my 4 PCs that not in audio system at all in order get rid any hum

jessie.dazzle wrote:

(Romy, it would be great if we could edit our posts).

Jessie, the forums are configured that each poster might edit own post within 2 hours after the posting, do you see the “edit” button

jessie.dazzle wrote:

(Romy, it would be great if we could edit our posts). Jessie, the forums are configured that each poster might edit own post within 2 hours after the posting, do you see the “edit” button The Cat

tuga wrote:

Romy, Could your edit button be OS/browser dependent? I have wished to edit a post and never found the mentioned button.

Nope, it is not as it managed by sever code. Let consider it as a bug and I will fix it when I have time. I was under impression that posts are editable by owners – I do edit my own posts sometimes. I though everyone have this option. It is strange that no one complained about it before.

Paul S wrote:

No, the ceiling fan switch is not supposed to read through the PP 2000.&nbsp; But, that's Showbiz, or so I'm told.<BR><BR>No doubt APS has loads to say about it, as ever...<BR><BR><BR>Paul S

beachbum wrote:

I may have been misunderstood on my fan pop. I dont have my 2000 yet. Using a lent older model 1050 the unit was plugged in during the pop. All of the trouble i went through installing 2 dedicated lines with separate ground is now sitting idle with only the 1050 plugged into it O well.

I wish people understand the electricity problems more as impediments of objectives. Good electricity that does not screw up Sound is not the goal but juts a mandatory means. After the electricity is not the problem the biggest question might be: what new opportunity the non-problematic electricity opens up for playback organization?

Let me to explain how I see the things.

Let pretend that we have a hypothetical playback that plugged to the wall and power but known bad electricity. The decisions that were mane within this playback reflect the critical choices that were made for the given playback to do its best under the given condition. Now, by the mean of PP2000 of anything else the electricity problem is addressed. Now the “conditions” are changed, does it make the “critical choices” for thins playback to be different?

So, the way how I see the thing is no reconsolidations about playback setting were made in context of good electricity then ether the old “bad electricity decisions” were not sensible or the new “good electricity decisions” are not taking a full advantage of what is going on.

I understand that people are looking what “black box” to buy in order to deal with electricity problems. However, what I am more interested at this point is how the better electricity changed somebody thinking about other playback’s techniques and about the means the set the plays in the new “critical” mode.

Romy the Cat wrote:

Let pretend that we have a hypothetical playback that plugged to the wall and power but known bad electricity. The decisions that were mane within this playback reflect the critical choices that were made for the given playback to do its best under the given condition. Now, by the mean of PP2000 of anything else the electricity problem is addressed. Now the “conditions” are changed, does it make the “critical choices” for thins playback to be different? So, the way how I see the thing is no reconsolidations about playback setting were made in context of good electricity then ether the old “bad electricity decisions” were not sensible or the new “good electricity decisions” are not taking a full advantage of what is going on.

Floobydust,

I very much disagree with you on it, not because I have an alternative view but because I have practical evidences that what you say is not sufficient definition of “good for sound electricity”. The lower THD is not adequate representation and there are many examples of very low, fractions of present distortions and consequentially a perfect since, built not satisfactory sonic results. Reversely I have expense the good electricity days with about 5% distortions and sinusoid looking like a railway after nuclear blast.  I do have a large collection of varicose devises that I was employing to fight electricity over the years and I need to report that it is not as simple and predicable as you say. The PP2000 is certainly nothing new in nether concept not in implementation. However, among what I experienced PP2000 is very much new in results. If you can name me another available power devise or tested  and rendered implementation principle that might help to eliminating those subjective negative effects of bad electricity but do not affects the core sound of played material then I would be only grateful for learning about it and would gladly try it.  I am sure we understand that it is very much not about PP2000, I would gladly do not have it if I know HOW to deal with bad electricity myself. The problem is that I do not know. That, BTW, why I created the following thread:

http://www.romythecat.com/Forums/ShowPost.aspx?PostID=9623

Rgs, Romy the Cat

Floobydust,

and this is exactly why I ask what “other available solutions for clean power” do the job but do not “hurt” sound. The reason why I ask is because if I know, let say 3-4 devises, of the different designs that do the “electricity cure” with no “hurt”  then it would be possible (I hope!!!) to abstract so kind of a  common denominator between them and to learn what actually cures the power supplies and what is irrelevant.