im pretty sure i had to do that to get sonic dd encoder to accept the input mono waves, im pretty sure it had some kind of problem accepting 24-bit input..its been a while so I dont really remember the reason, but its either that or wave wizard had problems with 24bit wave files.
and for the record, i haven't been able to hear any quality loss, as a matter of fact, the encoded ac3 sounds as good as the eac3 source after i encode it with sonic dd encoder. aften and the few other encoders i tried did produce a slight quality loss on the resulting ac3...the db levels and range seemed to be a little out compared to the original track
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