I was thinking about the wattage just after I posted my question. And now I can see you confirm it, that the impedance gets lower the more wattage/power you put into the phones. Thats why the big impedance amps always are much bigger than the smaller ohm amps.

I bought two amps a couple of days ago, one surroundsound-receiver which has 6ohms to 150 watt.

And also a Audiolab Q-Dac/headphone amp with 40 wpc into 8 Ohms, 60 wpc into 4 Ohms

The surround-amp has way more power and punch, feeded with my Dune HD mediaplayer, than the Pc-Dac-Headphone combo or the Pc-Dac-Surroundreceiver combo.

The surroundreceiver is just a cheap 350£ on sale for 250£ Pioneer Vsx-923, that I can use for an entrylevel surround-solution, and also as a relative good stereo-amp until I upgrade for better equipment.

Can you tell me what kind of how many ohms into watt I need to look for then? *I know* almost absolutely nothing about electricity and currents, so for a noob whats the rule of thumb when looking at the ohms and watt specs?

I understand there is a difference in ohms out and ohms in. What it is I will try to learn