@maxwave With MSB dacs there is really no need for a preamp. This is especially true if you are using their amps. The dacs and amps are designed to work together with matched impedance. I do not have any analog sources so being completely digital is perfect for my use. If you go up to the Reference dac there is actually an analog preamp section as well for use with either xlr or rca inputs. The cascade dac now offers multiple analog inputs too.
One advantage of their designs is that if you are using a digital input there are no amplifications stages after the dac section. Their dac modules output enough voltage that there is no need for op amps. The signal is only attenuated.