made a dac with 3 r2r bords and passive output without opamps ,tried with opamps it sounded dull and bad compared with my dddac, with passive output it beats ny dddac and my friends metrum pavane and a denafrips, they just got beated very bad, the psu used is a 3 stage psu with emi filters and lt3045 in the last stage, lm1084 in first stage and lf80 in second stage, and a lot af b4 15000uf caps in indput and before lt3045, this is the best dac i ever heard