Someone in the "Get Hyped for Vision Ears" thread that MusicTeck started when Phonix and EXT were released posted the question whether or not the Phonix bass was the Erlkonig setting number 2 or not. Here is my response to him. I have included it hear since this thread is more active than that one:
Yes the bass BA is similar to setting 2. But the final sound is different as explained below by Marcel and Oliver from the "Bob" interview in my review.
https://www.head-fi.org/showcase/vision-ears-phönix-iem.25667/reviews#review-27762
I copied two questions below from the interview that have to do with bass. One of the questions made the final cut for the review and the other was left off since it was a more specific Erlkonig question that Bob had the nerve to ask after numerous Kölsch beers while hanging out with Marcel and Oliver in Köln.
Bob: I am still very interested in the Phonix bass. You have stated that the Phonix bass is based off the Erlkonig bass on setting number 2. The bass of the Phonix is more impactful and shares sub and mid bass duties well. The Erlkonig bass on 2 has more of a mid bass slant. Is this difference due to a bigger stage on the Phonix?
VE: The bass drivers are exactly the same as with the EK and only a small change was made on the crossover to improve the performance. Because as soon as you improve the highs due to a new driver, the old balance is lost, so you need to adjust the other parts to get back everything into balance.
Bob: This is a sidenote question that has nothing to do with Phonix. Was the Erlkonig tuned on number 2 or number 3? And then after it was tuned on one of those were the other numbers/frequency bumps added for variety of sound? Or did you go into the Erlkonig project with 4 distinct sounds in mind?
VE: I cannot tell exactly because the development process of the ERLKöNIG was a big journey and the first prototypes were adjusted again and again. Sometimes because we thought its necessary to adjust something and sometimes we had to change something due to the shell or other reasons that force you to find a compromise. The first prototype had only one tuning and I think it was close to tuning no. 2 because from our taste, this is a good and still powerful balance. The idea of using a switch was quite early in the developing process and we had these distinctive sounds in mind already as an idea. So, yes, position no.2 was the bass sound from which we developed the the other sound signatures.