My philosophy is to seek a high quality, high resolving DAC. Then, work with the signal downstream to fine tune to your system. I have a great midrange and lower-end with the addition of Elrod power cords, gold fuses, Jade Audio Hybrid Gold cables, and a BAT preamp. The gold cables are particularly notable for a full and natural midrange without any loss of detail.
Also, you may wish to consider that the Krell may be a limiting step for your midrange. So, you should consider a system approach rather than trying to achieve all your goals at the source.
Also, you may wish to consider that the Krell may be a limiting step for your midrange. So, you should consider a system approach rather than trying to achieve all your goals at the source.