I'm finding it difficult to describe how this sounds, so this may not make much sense but here it goes anyway. I would describe the sound as "colored", as if I had an equalizer going with terrible settings. This is not the case, in fact I'm not using any equalizer anywhere - not in Winamp, not in my Realtek audio manager, and not in my EqualizerAPO(I installed this to try "fixing" the sound to no avail). I have also noticed most sounds are "scratchy" and also lack bass. (Could this be due to a lack of an amplifier?)
I have also noticed this in video games too, so it's not just music.
This being your first pair of decent headphones, you're probably realizing that you can hear the difference between poorly mastered / high compression music vs. high quality mastering and less lossy files. Do you happen to know much about audio file types and compression?
With more accurate reproduction of the data in your music files, it's much easier to hear the difference between crummy and good files. That's my guess for what you're experiencing. Are you using mp3s, streaming via something like Spotify, etc?
BTW had I seen this thread earlier, I could have chimed in on the DT770 32ohm vs HP150... I own both.
They're both great headphones; the HP150 is better out and about, isolates better, is probably better without an amp... However I think the DT770s have a little more magic to them. They are best in a controlled environment as they really don't isolate well at all, they're awful outside or if there's noise around. You basically lose the low end if there's anything happening around you. However when you've got them home you can really enjoy them the way they're meant to be enjoyed. They scale better with better source and amp compared to the HP150 IMO.
I would say you should postpone judgement until you get that amp / dac setup rigged and make sure you've got some shiny clean files to play through your headphones. I think you'll find that the DT770 really shine.
I don't think it's a matter of poor mastering. I've listened to many different songs already with these from different artists and completely different genres. As for the file formats, the majority of my playlist is in mp3 format with 320 kbps bitrate and 48,000 Hz joint stereo. I also have a fair amount of lossless flac. I do not use online radio, though I do sometimes listen to music on Youtube (HD videos preferred because the audio tends to scale up with the video quality).
Right now, Amazon currently has these headphones flagged for review, which makes me wonder if I may have just received a bad set.
Item Under Review
While this item is available from other marketplace sellers on this page, it is not currently offered by Amazon.com because customers have told us there may be something wrong with our inventory of the item, the way we are shipping it, or the way it's described here. (Thanks for the tip!)
We're working to fix the problem as quickly as possible.
At this point I am willing to consider something else up to $300 total granted that they allow me to refund this (which they probably will.) I also am considering the option of open back headphones now that the weather is getting cooler (I didn't consider this before...) and I do not need to use my horribly loud air conditioner, and I now have a very quite computer thanks to my new Noctua heatsink. Those were the two main sources of noise in my apartment and they are no longer an issue.
I am looking at the DT 880s("semi open") and the HE-400s(open), both of those I found on a video from Tek Syndicate (https://youtu.be/VgTnJ3JQQ0E). I google'd these for a little bit and people are saying they're both pretty comfortable (880 maybe a bit more so) and both are great quality. The 880s are supposedly a little bit more detailed and the HE-400s are supposedly "more fun" (whatever that means). That all being said, I'm open to other suggestions too. I will read through all the replies here again after work and double check everything. I may also make a new thread for this though I'm not sure yet.
edit - according to the headphone buying guide, the dt 880s are marked neutral with treb emphasis, and the HE-400 doesn't appear to be listed here though.
PS. I apologize for any typos and lack of clarity as I made this post while pulling a rather bad all-nighter...