Digital cable length- SPDIF vs AES/EBU- 1.5 meter for either?

I also read a thread here a bunch of years ago, where Charles Hansen of Ayre, recommended unplugging TV and DVD player before listening to music...makes a difference in my system 

Thanks for your post jl35 . Nice to know I'm not the only one .
 In my system the difference is NOT subtle ! Might be a function of living
 in a condo where the whole place is on same wires, but lot of people are in that situation ,

I'm in a house, in a small town, but for "really serious listening" I unplug TV, DVD and internet, and the difference is also not subtle...

I too have noticed this phenomenon, when I lived in my apartment.  The differences were NOT subtle. All the electronics, including my alarm system and wifi were all on the same branch.  

In my new home, I don't have a dedicated line perse, but nothing extraneous is shared on the electrical branch, which I think is a good thing.  I haven't gone to see if unplugging the modem and wifi downstairs on a different circuit will make a difference in the house yet. But you are not alone.  It was almost mandatory for serious listening in my apt. 

Re:  1.5 meter digital cable   

Lessloss offers both 1m and 1.5m as standard lengths for both their 75 ohm S/PDIF and 110 ohm AES/EBU.     Their explanation is here.