Apple Logic Pro /LogicExpress Discussion

>Just to clarify, XLRs, unless they have been modified
>which is very unlikely, are balanced so I din't think
>they contribute to your hum problem.  JP

Note that having three conductors doesn't necessarily mean that the 
circuit is balanced. The sending and receiving device must both be 
balanced for the circuit to be balanced. It's still a good idea to 
use the third wire in an unbalanced circuit, connected at one end as 
a shield, but it won't give you the same benefit as a balanced 
circuit.

Some balanced inputs are very unhappy being fed with unbalanced 
signals. It's unlikely that a home studio-level input like a Tannoy 
Reveal would be in that category, but it's possible.

Also note that balanced circuits work by reversing the phase of the 
third wire at the receiving end of the cable run, cancelling out 
noise picked up by both "negative" wires along the way. The can't 
help if noise is induced somewhere else, such as the receiving 
device's input jack.

Usually buzz is induced through the air or by a short, while hum is a 
ground loop. But not always.
-- 

Nick Batzdorf
818/905-9101, cell 590-9101, fax 905-5434