Discussion in 'Pro Audio Gear' started by silent_nick, May 10, 2003.
All audio has a hot(+) and cold(-) line. With unbablanced, the cold and the ground are combined making a 2 conductor connection (+) & (-). With balanced, the hot (+), cold (-), are seperate from the ground shield (s), for a 3 conductor connection. Additionally the cold side is flipped out of phase at the outputs and then fliped back into phase at the inputs, so any additional noise picked up in the cable is cancelled out. Kurt
Balanced isn't always needed. It is more expensive, involves transformers or additional electronics to accomplish. Short line level +4db runs of 20' feet or so, unbalanced, will not add significant noise in the line. If your rack gear is within these limits you are cool. Unless you are in an extreme RF and Hum saturated place. I said 20', like a round trip from the patchbay, or insert to your gear rack. If it gets longer, you can check for RFI and other noise with a good digital meter.
Mic lines require balanced, if they are high Z unbalanced you will notice noise, and because the impedance is high, after 6' to 10', the resistance of the mic and the capacitance of the cable will start to roll off high frequency, the gain for mic's is higher, and along with that, noise gets amplified too. For mics, stay with Low Z balanced. You can run a hundred feet and be cool.
When using unbalanced +4db rack gear, you should be cool. If you have an all balanced run, and cables, use it.
Actually you should not use a mic level out into a line level device, there just isn't enough gain, but I catch your meaning.
Eventually all signals will end up 2 conductor unbalanced at some point. The idea of balanced is to prevent noise build up, and signal loss in cable runs.
For your drum OH mic, you would go to the board, balanced, with your mic and apply the RNC through the direct out into your recorder from the channel strip, or through the channel insert loop which will be unbalanced line level.
I have a junk drawer of matching transfomers, and unbalancing cables and the like, but only maybe a hundred dollars worth of stuff.
The compressor would be inserted at the mixer channel. You would never plug the mic directly in the compressor, for one the compressor has no phantom power for a condenser mic..
In a pro studio, all equipment is intefaced through patch bays with the appropriate balanced or unbalanced wiring accomodated. The way a patch bay works, the cold side of a balanced connection is automaticly connected to the ground shield when a cable is inserted.
Mackie 1604 VLZ-Pro mixer
MOTU 24 I/O
So the unbalanced connections of the RNC never have a negative effect because of the short distance of the line to/from it and the mixer (less than 20'). Am I correct?
Nick, YES, With your 1604 you have all the in/out configurations you need. The inserts are unbalanced, and will work perfectly with your RNC, as Kurt said, and as your system grow's large enough to need a patch bay, your mixer and rack gear will do the job nicely.
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