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The two remaining boards are mono DACs, in which a discrete 32-stage FIR DAC and a single-stage 4th order filtering I/V converter convert the PWM into analogue with a breathtaking 140dB SNR
Read more at http://www.audiostream.com/content/mola-mola-makua-preamplifierdac-and-higher-note-and-lesson#bYItUi4THbQKq27O.99