Balanced vs. Unbalanced Levels Question

[chrisrulesmore]

I often see reviews of interfaces with unbalanced line inputs using outboard pres with balanced line outputs with 'no problems,' but can someone give me a short breakdown of the differences between balanced and unbalanced signals and how they relate to cabling and levels?

For instance, I see cables with balanced and unbalanced connectors, and I see different reference levels for the two signals. If I am going balanced to unbalanced, am I simply not getting an even level in and out, or are there other areas of concern? Do I need cabling with balanced xlr to unbalanced trs connectors?

I realize this is probably pro audio 101, remedial, but I would appreciate some clarification.

-Chris

[bringmewater]

http://www.dplay.com/dv/balance/balance.html

and

http://sound-on-sound2.infopop.net/2...44&m=651102982