Audio Note does nothing but non-oversampling DAC's, and we pride ourselves on great analog output stages, (transformer coupled rather than cap coupled from Level 2 Balanced on up), but, having started with analog filters rather than digital filters, we're moving as quickly as possible to NO filters. These choices and changes have all been based on audible musical outcome of each.The Level 4 DACs were built that way from the start, and Level 5, 3.1x Balanced and 2.1x Balanced are going that way as we speak. I'm waiting for the kit to upgrade my 3.1x Balanced here, and I can't wait to hear the results.