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Boulder 812 DAC Preamplifier User Guide     Scan QR code for 812 Owners Manual 255 S. Taylor Avenue Louisville, CO 80027 Tel: 303-449-8220 E-mail: sales@boulderamp.com web: www.boulderamp.com Facebook: www.facebook.com/BoulderAmplifiersInc Instagram: @boulderamplifiers Twitter: @BoulderAmps