I'll try to explain my situation here. I usually listen to my headphones for 3-4 hours each night. The first few hours are just background/casual listening, i.e. having the music on when I'm reading or working. Then I'll do a hour or so of critical listening before bed.
The problem is although my setup sounds good when I first listen to it each night I find it losing much of the 'wow' factor when I finally began serious listening. I'm not sure if that's because my ears are tired or because they're so accustomed to the sound after hours of exposure they no longer find it interesting or impressive.
Has anyone else here had similar experiences as mine? Do you guys use your main rig for background listening or keep them only for critical sessions? Should I get a pair of cheap (say, less than 50 dollars) headphones for background use so to not spoil my main setup? Or should I just stop using music as background noise?
Also if I am to get a pair of low-end phones, what should I get? I'm thinking about Senns PX-100 at the moment as they're open (closed phones are a quite tiring for me) and are said to be very comfortable with a rather laid-back sound. But I'm interested in other options too.