Component grounding

Then the question is, is this a good idea, or does it create a ground loop that can make the signal more subject to hum, not less?

Why do you feel you need additional grounding?

Generally speaking, modern components fall into one of two categories

• those with grounded power cords
• those without - i.e. two pin plugs 

For the latter, the chassis of the ungrounded components cannot be grounded and may "pickup" some EMI/RFI - therefore grounding eliminates this and may prove to be beneficial

Having said that, some components with a grounded power cable may not ground their chassis either, so they fall into the same category as ungrounded

So without testing each component its hard to tell which would benefit from additional grounding

Some people swear by chassis grounding - but I've never found it to be beneficial on any of my systems

But that's not to say it might be beneficial under certain conditions

Regards - Steve

Thanks for the helpful input. 

I introduced a 'new' integrated into my system and a hum appeared. In fact, I had owned this same model integrated about 10 years ago and seem to recall a hum at that time too. My tech friends assert that there are no technical defects, just something peculiar about the components' interaction. The hum goes away when I plug the amp into the second receptacle of the wall outlet, or when I use a cheater plug to connect it to the Shunyata. 

Ultimately I modified a power cord, disconnecting the ground wire. That took care of the hum, but then I began to worry that the amp was now ungrounded. So I installed a wire between the phono ground post and the grounding posts on the Shunyata. Maybe it's not necessary. 

@rfprice - that hum is probably due to the unit having a two pin plug OR being ungrounded.

This is common and easily remedied...

1. try connecting a piece of wire to the ground point on the power conditioner
2. then touch the other end to any unused RCA socket on your amp
3. the hum should disappear.

If it works you can make up a grounding lead as a more permanent solution using any old RCA plug, but connect to the neutral side of the RCA only

My NAIM amp was designed in such a way that it relies on the source components being grounded. So if the source had a two pin plug it would cause a hum

Hope that helps - Steve