It is great that you like the 07x so much. It sounds like I need to do the demo of the CODA #8 and #16 soon. I was listening to a Playlist of tunes that I had collected over the last few months. I had not played it until yesterday and on the 07x I was amazed at out engrossing the sound was. One song in particular was so good I had to listen to it a few times, Jefferson Airplane - Miracles. The best part of it for me was that I was thinking I need to switch preamps (to the HPA4) and listen to this Playlist again. I doubt it will be better but it will be a little different and I am sure immensely enjoyable. A treat to have 2 great preamps that are actually not that expensive in a relative sense.I have now listened to both 07x fet and la4. Short answer: As good as the LA4 is,the Coda is much more balanced, fluid and does in my opinion have all what is there, no roll of here! It is the best pre i have heard. period.
Long answer: The LA4 is linear, and has all the details. Maybe more lit up in the middletone. maybe a little brighter and direct. The Coda is more balanced and fluid, velvetly. A fuller tone. More for longer listeningperiods . Listening to Bruce Springsteen can be a challenge over time with LA 4, not so with Coda, i have never heard Bruce so easy listening, yet dynamic and natural. This is together with the dynamic 16.0. I guess it suits the 07x fet perfectly. When they bulit you brither, they broke the mold (Springsteen) just listen to the munnharmonica on this song...
ps, I will keep the LA4 for its versatility and craftmannship but coda wil stay as no. 1 pre. The LA 4 is the second best pre i have had.
I do think there is a bit of rolloff on the 07x based on my RAAL SR1a headphone playback. These headphones are the most revealing speakers I have ever heard. I even use my best speaker cables on the headphones, Audience FrontRow, instead of my floor standers because they make a bigger difference on the RAAL. The CODA 07x was the only preamp that could tame the high frequencies on the RAAL. Except when I used DSP and clumsily chopped of some top end using ROON DSP engine. I no longer do that with the CODA.
I can listen to the CODA 07x for hours, which I do everyday. With the HPA4 (LA4) bad recordings were a little annoying.