SPL PHONITOR X Here on my desk for review is the Phonitor X and E (same but without crossfeed, preamp, and vu meters) It is solid state and is rather expensive at 2499 USD the E version with the same exact sound quality but stripped of the extras is 1499 I have been listening to it with the 650 today and have to say that tonally it is a much better pairing for the 650 than the Pro iCan as well as my Trafomatic head 2 so far. Spoiler: Mom's mini AB session I can't really get deep into the sound yet but what I will do is quote my mothers perspective when blind A/B/C ing between my Trafomatic Head 2, iHA6, and Phonitor X. A. Phonitor B. Cayin iHA6 B(pt2). Trafomatic Head 2 Me underestimating my mother: " Mom, I don't know if you will be able to hear the differences between these amps. Headphones yes but these amps can be harder" Then I listened really quick and thought... Nah she won't know the differences. Stupid me. My mom: "A. It sounds as if there is air being pushed and the music is coming through that air. The music sounds more realistic than 'B' When the music pans back to my right ear it does it with more vibrance and realism.... 'B' sounds clear but like I am listening more from a machine kind of. 'B' sounds more realistic and natural.... This is easy 'A' sound a lot better to me. I can tell the differences easy" Me: "So mom, dynamics are the differences in loudness in the music. You have an audible wave signal with peaks and troughs and if an amp is dynamic you can hear those contrasts better. Which sounds more dynamic to you?" Mom: 'A' Me: "Okay listen for separation...Just close your eyes and tell me which amp sounds like its easier to hone in on the individual sounds" Mom: '"A' without question" Me: "Now time for the next AB vs my tube amp I won't tell you which amp is which." ( I kept A the same but she couldn't see that) A. Phonitor B. Trafomatic Mom: "I really like this headphone (650)... Anyway I like A (she didn't know which amp it was) but these amps sound a lot closer to eachother. For some reason I have yet to figure out, I like 'A' more. They both sound really good but 'A' just sounds better to me. Now which amp was 'A'?" Me: "What I hear mom is that 'A' is still more natural sounding than even my tube amp so far but my trafomatic sounds a little wider. I like the midrange better on 'A' (Phonitor). Actually I didn't expect it to do better tonally... Well thanks for nerding out with me mom. " I would like to start a tour here for the E if I am allowed but before hopes arise I need to contact the vendor who has been enthused to share this gear but a little busy.