Anyone else notice that the sound improves half an hour or so after startup? Could very well be that's in all in my head but I notice this every time... Also possible my ZX507 isn't burned in fully. I always notice something is lacking in the sound if I haven't turned it on for a week and then gradually 30 mins in I notice greater transient impact. Very happy to concede it's all placebo but I think this every time. Just wondering if anyone notices this also. Wish I could keep this player on all the time but keeping it on charge all the time can't be good for the battery.
Digital circuitry performs best when it’s functioning at its optimal temperature. I believe your observation about sounding better after a half hour is an example of this phenomenon.