If you switch from Battery to Ignition some cars loose the ignition power between this switching. How is the empeg's behavior? Does it switch of and boot again or does it stay alive during such a short power-loss?
An excellent question, tee -- one that to the best of my knowledge has not been addressed in this bbs.

It depends...

I'm not sure what you're talking about when you say "some cars lose the ignition power". I think what you're saying is: Some cars deliberately shut off the radio's ignition wire as part of the ignition-start cycle. And even the radio is wired to the always-on power, there's a power drain throughout the entire car's electrical system as the starter motor spins which might affect the radio.

If wired to the ignition, the Mark 2 will be able to handle this just fine as it's been designed for it. It will just go briefly dark during the startup, then keep playing just like any other car radio does. There won't be a reboot.

If wired to the always-on power, the Mark 2 should also handle it since it can operate at lower voltages than the Mark 1 did. Whether or not it goes dark or keeps playing right through the startup sequence is probably going to vary depending on how much drain the starter motor puts on the system. Every car's voltage will drop by a different amount during startup. If it drops too much, then the Empeg will reboot. My Mark 1 didn't reboot on my VW, it just went briefly dark during startup as it was supposed to. I only had problems after I moved it to my Honda.

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Tony Fabris