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Relax on the balanced output guys! Posted by Chuck Swindoll, Jr. [IP: 208.21.231.175] on February 01, 1999 at 01:02:27: In Reply to: Relax on the balanced output guys! posted by Andre Yew on January 30, 1999 at 17:03:03: :If you look at pro equipment, they also transmit their line-level signals in balanced. See the first line in my statement. In most any good pro sound studio/venue, balanced connections are used exclusively. : Balanced connections are the only consumer method of properly transmitting line-level signals because the shield of the cable is being used as a shield instead of a shield and a signal ground reference. Sure, but if you have that much noise to contend with in your home, you may have better solutions to answer your problems. For one, you may have EXTREMELY poor electrical lines, and you need to call an electrical contractor to your home to find out why there is so much bleed through your walls. Secondly, if RF interference is your problem, line your walls with copper before you try to solve it with balanced lines as even a balanced line will give you fuss if you have that much RF interference. Third, if your problem is ground hum (or a loop) then you would be better off driving a 12 foot copper pole in the ground, and isolating your home audio system ground from the rest of the house, as the equipment is just going to send the hum right through your balanced cable without any resistance whatsoever, and while your at it add an isolation transformer to power your system as you will solve a lot of problems in regard to buzzing, clicks, and pops there too. Further, maybe you do not understand just how a balanced signal works. As you must already know, there is a positive, negative, and shield in a balanced line, whereas in an unbalanced line there is only positive and negative connections as the ground is connected with the negative line. FYI- all a balanced signal does is invert the phase of the positive line of the signal (thereby making it out of phase with the negative line). The negative line is left alone. Then, when a balanced signal connects to the balanced input of the next piece of gear in the signal chain, the positive line is simply placed back into phase with the negative line. By doing this, the noise that has been picked up on both the positive and negative lines -in the cable run- is put out of phase with itself, and therefore the cable noise disappears. A really simple concept, and in no way does it make the signal any better in quality or strength as compared to an unbalanced connection. What we are dealing with here is the CABLES ability to reject and filter noise - not with the quality, integrity, or strength of the signal itself, or with the noise the gear itself may be causing. That is why cables run in a home system that are anywhere from 1 to 25 or even 50 feet or so in length do not need to be balanced as there is no need for the cable to be highly resistant to noise. There just simply is not enough (if any) noise to reject in a short home audio cable run.
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