No real improvement . Also, you would have to get another D/A converter box to do this. Your MR is fine going analog to the speakers. Better cables would be the cheapest option IMO.
If you have noisy speakers you will not rid them of white noise etc. What I do here is turn the input on the monitors all the way down and adjust my volume going to them from the MR Main Volume. This keeps the speaker self noise to a minimum. Im using Persons Sceptre S6’s here. Anything past 9 o’clock on them and it gets pretty noisy.