I will be getting a new amp entirely for either headphone choice. Basically selling of my current setup and reallocating that money towards the new setup, so if i go auteurs then slightly less expensive amp, if I go aeolus pricier amp. In the long run I'll upgrade everything regardless, but for now thats how it will be. I prefer solid state overall, both in terms of sound and not having to find tubes that work to my liking. I am the type of person who does not like infinite options, I much prefer to have one very well crafted option and just enjoy that.
Do you by any chance have any experience with alpha primes or something similar, at least in the bass department? I'm having a tough time knowing wether I will find the auteurs lacking to my preference or the aeolus too mid bass centric for my preference. I enjoy a good deep sub bass rumble, especially for electronic songs. I also enjoy getting that full heavy impact of a good chugging breakdown, the thump of bass drums (I'm a drummer so I focus on drums a bit more in most songs), but also have the detail and clarity to pick apart cymbals and instruments. I'm just trying to figure out where my alphas land in terms of sound respective to the aeolus and auteurs, so that I can figure out which one will provide the change in sound I'm looking for. Right now the alphas sound to me nicely detailed and sharp, but sometimes on the edge of too sharp and in your face, but I love how deep in the bass they go for rumble, but they lack some of the fullness on songs that aren't artificially pumping in more bass which can make a lot of metal just sound a little too anemic and fatiguing.
As far as i can tell the zmf headphones are closer to what i like, I've also had denon d5000s for a while and enjoyed those for what they were. They just lacked mids and detail, and any instrument separation, but it was comfortable and fun. I just dont want to lose the detail and speed i get with alpha primes, but instead get some more bass impact without losing sub bass much, and get less intense highs without losing clarity or precision. Also how are the vocals between the two zmf? in terms of spatial presentation, because like i mentioned I tend to focus on the drums and instruments in songs before vocals, so when vocals are too far forward or present it can get harder to focus on everything else. Kinda why I like neutral headphones with a slight warm tilt, nothing is too much or too little, and a slight warm tilt helps long term comfort with my music preferences.