Wow, that is two very different headphones.
I am currently in the middle of a run with the Ambrosia’s. I have had them for a few months and they just get stronger and stronger, IMO. I just put these back on today and it was a great day. I played pop songs from the 70’s through my Schiit Valhalla 2 amp.
Good solid bass, clean and clear mids and a good amount of treble. They are light, comfortable and sound great. And they are Cheap! $399.00, last I heard.
I am loving them.
The 109’s are new to me. I bought them used a few weeks ago for just over half of retail, plus taxes.
The mids are beautiful and amazing.
The bass is just enough and no more. I have never seen bass measured out this carefully by a headphone.
The treble is Large and can get hot with certain music. Very high pitched vocals and horns can get a little sharp or piercing. I think these might be tricky with opera or classical, but that is just a guess.
I ran them for ten straight days on my first listen. I really liked the sound for the most part. One evening I found the treble bothersome but I have not been able to recreate the situation.
They are Great with rock and pop. The bass seemed light at first, but when I played some bassy songs, the headphones were just booming. And in a great way.
I like these headphones, but don’t love them. But I can’t make a full decision after one (albeit long) listening session. If I had paid full price (in Canada, it would be $1,099.00, plus 15% sales tax), I would likely be returning them.
Since I got a great deal buying used, I will try them for several more weeks.
At this point in time, I think the Ambrosia’s are the better headphone, for my tastes.
They also take nicely to bass boost. I have not tried adding any bass to the 109’s yet.
If you have any other questions, let me know.