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

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.

Sorry, just saw this thread. Are you all saying any coax digital cable that is not 1.5m long should be tossed out? Why are they even manufacturing cables that are in different (from 1.5m) lengths?

Are you all saying any coax digital cable that is not 1.5m long should be tossed out?

Kalali, please read the posts by me and by Kijanki dated 1-25-2016. As you’ll see, there are numerous technical variables affecting what length will be optimal in a given application. Some of those variables are almost never specified (e.g., the risetimes and falltimes of the signal provided by the source), and some have little if any predictability (e.g., susceptibility of the two connected components to ground loop effects, which can contribute to jitter at the point of D/A conversion).

So as I said in concluding my post:

I would consider Steve’s recommendation of 1.5 meters to at the very least provide the best odds of being optimal.

This assumes, btw, that a very short length, such as say 6 inches, is not practicable. In circumstances where it is practicable, I suspect it is likely to be an even better choice than 1.5 meters.

Also, past threads here have provided anecdotal evidence that 1.5 meters is not always the best choice. Some members have reported making direct comparisons of 1.5 and 1 meter cables that are otherwise identical, and preferring the 1 meter length.

Regards,
-- Al