Negative Effects
Generally speaking Haeco-CSG has a degrading effect on the performance of both stereo and mono sounds processed through the system. The effect can vary substantially from one recording to another depending on the characteristics of the original unprocessed sound. The system "blurs" the focus of lead vocals and other sounds mixed to the center of a stereo recording. As bass frequencies are centered on most recordings it also causes a partial loss of low frequency information, making the resulting sound somewhat "tinny." This negative effect can be heard on any stereo speaker system, but makes headphone listening particularly un-natural sounding. This is because the lead vocalist or performer's audio waveform would be attempting to partially cancel itself inside the listener's head, confusing the brain's audio positioning sense.
Due to complicated issues of phase and frequency it is difficult to predict exactly how the reduction from two channels to one will affect the sound of a particular instrument. Therefore mono sound from a true mono mix is always preferable to the use of an automatic process such as Haeco-CSG which converts stereo to mono.
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