Will it hurt anything to leave the Magni on constantly while not in use?

I may go ahead and try to get one then. I'd just hate to spend more money and find out I still can't tell the difference, haha. To use the E09K, do I also need the E17 device? I'm curious about the Schiit Magni as well, that's a bit a cheaper than the e09k. thanks so much for your help...

As a noob who's been pretty happy with AD700s, I got my MDs today and have to say I couldn't really tell the difference between the the two (apart from the obvious of open vs closed). I'm only running these on an Xonar DG, could this be why? I blew all my spending money on the MDs, so I don't...