I just have the n-sub… 
Have same dac and speakers. Try different cabling on dac for effect. The dac is very susceptible to noise. In my case I had a slight microphonic echo to it with ”standard” cables (usb, signal, power). Much better results can be achieved with upgrades. Both Powerline and Hiline imho. Usb is more of a lottery.
Also, more importantly, try other spikes for these speakers. I only used the one that came with them for one day, sounded horrible as I recall. I use Soundcare superspikes.
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