Any clarification about what happens would be useful indeed.
Meanwhile I have cooked the cables for 2 days with demagnetization sweeps. I'm pretty sure the problem is the cables because the sound has been more stable during that time (with cheap cables). First impression was a little dull, but that disappeared within a minute. It's now pretty good, a little sharp but that always happens right after connecting a cable. Not much can be concluded yet.
If the problem remains I think I will remove the plugs to check for any problems. Anyhow if something fixes it I will post it here.
Meanwhile I have cooked the cables for 2 days with demagnetization sweeps. I'm pretty sure the problem is the cables because the sound has been more stable during that time (with cheap cables). First impression was a little dull, but that disappeared within a minute. It's now pretty good, a little sharp but that always happens right after connecting a cable. Not much can be concluded yet.
If the problem remains I think I will remove the plugs to check for any problems. Anyhow if something fixes it I will post it here.