Ok, so the thing is that I have an Ashdown Tourbus 15 practice amp at home which I always use with headphones when practicing (which is a must for obvious reasons). The headphones I use is an Audio Technica ATH-M20x which is an entry level studio headphones. The problem: When listening through headphones the sound coming out of the headphones are dull, lifeless and boring. I tried using my Ampeg classic preamp while practicing. It helped a little bit but still a "meh" sound. Note: I do like the sound of the amp when headphones are not plugged in and sound comes from the speakers. The question: Is it even possible to get a decent, full, rich sound through headphones like I usually get when playing headphones-unplugged or am I forever doomed with this dull sound if I want to play headphones-plugged-in? If I buy another amp to a different one (like a Fender Rumble 15) will it help me any way or should I invest into a higher level pair of headphones?