The one time I was absolutely blown away by a pair of headphones that are not in the insano area, are the beyerdynamic dt1990. They aren’t cheap by any means but not insanely expensive. When I listened to music I’ve listened to hundreds of times, somehow they showed me even more detail I haven’t heard before. For example a Nena 99 red balloons LP, the amp was still the same as always but I couldn’t believe the amount of detail there was in the background, the soundstage those headphones were creating.