i have the promitheus tvc & also had the dac-ah. ihave recently upgraded to Reimyo DAP-777 dac. Just take my word on it, th dac-ah does NOT match with the TVC.the dac-ah output impedence was too high even for my ASL hurricanes with 100k input impedence. lots of detail were missing, bass was sloppy and the noise coming from the dac was unbearable. the dac-ah is a good dac but not a good match with promitheus tvc, specially in stock form.