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digitally fixing channel imbalance
post Jun 18 2013, 05:31
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i have some needledrops i made which have channel imbalance.

i presume this to be the result of how the vinyl was cut

i want to digitally normalize the lower channel to the same volume as the louder channel

i imagine that wont destroy the music

in order to do this i need to find out the louder channels exact volume

i use sound forge 10, any help?
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post Jun 18 2013, 20:29
Post #2

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Joined: 24-August 07
From: Silicon Valley
Member No.: 46454

GoldWave ($50 USD) has a tool called Max/Match. It makes the left & right averages equal, and at the same time normalizes (maximizes) for 0dB peaks on the channel with the highest peaks (after balancing).

(Since the difference between peak & average is different for each channel, usually only one channel will have 0dB peaks after balancing & normalizing.)

I only use that when I feel there is a problem, because you could have a situation where one channel is supposed to be louder/quieter for part of the song and matching the overall-average levels could throw things off.

If you want to do this manually -
1. Measure the left & right averages.
2. Match the channels by decreasing the channel with the highest average.
3. Measure the left & right peaks.
4. Increase both channels by the same amount as required (if required) to normalize the channel with the highest peak.

(If you want to go through the math, that can all be done by taking the 4 measurements first and making one volume adjstment to each channel.)
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