Originally Posted by Ugly1
My understanding is:
There are benefits in differential noise rejection which can had by simply by using twisted pair ( the on topic subject of discussion here) as compared to using two random wires shaped into some big or small area loop antenna. There are also potential benefits to be had in rejecting differential noise by using balanced line circuitry as compared to using unbalanced circuitry. There is a difference between those concepts and the distinction is important in the context of the discussion here.
Stop separating these two things. A twisted pair is utterly useless unless it is being used over a balanced line. You can take two conductors and twist them together all you want for analog audio and it won't make a damn bit of difference unless the line is a balanced line, in that case it makes a huge difference.
I don't believe there is a requirement or that article or any other states there is a requirement that balanced circuitry requires twisted pair cabling but the benefits of using the two together will be complementary, ie there is a double differential noise reduction whammy when used together.
No. Please stop confusing everything together and apart. Again, differential is a distinct subset of balanced transmission. A balanced line may or may not be differential.
There is not any kind of "double whammy." There is only one noise rejection principle at work here, and it is common mode noise rejection across the balanced line, and the pair twist aids in improving this noise rejection attribute. If you twist a pair on an unbalanced line, you've accomplished nothing and rejected no noise at all.
Common mode noise is different, and twisted pair cabling does nothing to prevent it. Dealing with common mode noise gracefully is a commonly followed good practice since it can blow up gear but implementation may be different from techniques employed to deal with differential noise immunity. Both balanced and unbalanced circuitry may or may not contain circuit enhancements designed to offer better common mode noise circuit immunity, it depends on the whims of the circuit designer.
This is totally nonsensical.
It does. Please see premise of wiki twisted pair site I quoted. It reduces loop antenna area as compared to other two wire runs and thus reduces recieved differential noise.
Actually arnyk's main point which seems to be "(1) Minimizes the area within the loop created by the wires." is merely echoing the sentiment I tried making in my original post: it reduces a type of noise audio circuitry is susceptible to which is caused by antenna effect. Admittedly as Chris Wiggles helped me see my wording had a flaw in that I said it was reducing common mode noise but if you read my response to Chris you'd see that I agree this was an error on my part. The real antenna effect addressed by twisted pairs is differential noise recieved via current loop antenna.
It certainly wasn't my intent and I hope this post helps clear that up.