So I was able to get my hands on a new Ocharaku Flat 4 Akasakura and the Kuro Type II. The Kuro came in a metal canister while the Akasakura came in with a square wood box. I will post pictures later.
These are quite different units not only in cost !.
When comparing these units
The Kuro seem more relaxed , easier to drive with a phone. I was expecting a super dark sound signature but I felt that even tough they're are not the brightest around they were not macabre as someone else described. Tip wis they seem to work well with Spin fits, JVC and Comply. I felt that the Comply T 500 gave the best seal
Now the Akasakuras, that was something else. The sound had to be raised on the phone , is like it was difficult to drive these, their sound signature was lower in magnitude? (?sorry if I am using a wrong term). They really excel when I connected them to a Cayin C5. Also found that songs that were slow in tempo did not perform well but EDM type worked great. The tips was also an issue, I only found the Comply T200 Large to really seal
It seems that these units performance are really tied to the material on the barrel in which the drivers are located. the Kuros seem to be aluminum while the Akasakuras are wood. I am assuming the resonance within these barrels is what is creating the higher/lower scenario
I only had BA types around to compare with both units gave me a better sound signature than Shure 435. The Kuros under certain songs got close on sound to the Westone W50, but I could get a wide clarity extension that I did not see on the Ocharakus. Also handy was a pair of Audio Technica IM 50 with JVC dots, no one was able to get close on the bass unless a changed the tips of the W50
I was expecting difference between these earphones, but they were really different
Maybe someone has additional experience with these and can share hat have they found.