https://manpages.ubuntu.com/manpages/resolute/man3/gsm_create.3.html
Ubuntu Manpage: gsm_create, gsm_destroy, gsm_encode, gsm_decode - GSM 06.10 lossy sound compression
GSM 06.10 lossy sound compression
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https://www.sesystems.com/p-13205-atlas-sound-pd-30t-compression-driver-for-large-format-horn-speakers-with-30-watt-70v-transformer.aspx
SE Systems - Atlas Sound PD-30T, Compression Driver for Large Format Horn Speakers with 30-Watt 70V...
Atlas Sound PD-30T, Compression Driver for Large Format Horn Speakers with 30-Watt 70V Transformer
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