DAC to preamp technical question

Just saying it’s bad news not to be able to use RCA interconnects with it, which is fact, looking at what Al has rightly pointed out.

What I think about the sound of Class D has not even been mentioned here, if you want to bring it up there are other threads to do it in. 

Cheers George

"but after looking at section 7.3 of the NC400 datasheet "

Yeah, looks like your right Al, what a pain, not being able to connect normal RCA’s, as it’s ground floats at this point and this is where the shield (ground potential) on external equipment has to connect.

I don’t understand why they would design it that way, how would they sink any RF to ground when using XLR anyway, suppose they had their reasons, not good for sales though in my opinion.

Cheers George

Your better of driving your Hypex Nc400 direct from the variable output of the M1. As it’s output stage has better low output impedance drivability than the Bat has, you’ll also loose some of that excess gain doing so as well, and gain more transparency.

Musical Fidelity M1 Measured:                                                                                                                           The impedance from the variable jacks was 47 ohms at high and middle frequencies, rising to 76 ohms at 20Hz.

Bat VK51 Measured Test:                                                                                                                                Output impedance was twice that specified, at 410 ohms over most of the audioband. This is low, though it did rise to a high 4.7k ohms at 20Hz, due to the size of the output coupling capacitors.This will not be an issue with components having high input impedances, such as BAT’s own power amplifiers, but it does mean prematurely rolled-off low frequencies with low load impedances.

Cheers George