The JH5s seem to respond well to a break in period. I left them hooked up to a headphone out of the Clip and let it sit for a couple hours at a time to break in.
My right ear is getting used to the JH5- I think the seal is just the smallest bit on the snug side causing the air to be trapped in the ear canal when inserting the right side. After a few hours of a second session last night, the left was fine and the right just a bit itchy. This afternoon, the fit seems to be better.
Most of my recent listening time has been spent with Genelec speakers at work. I am lucky to have a set for my background music system in the office. It has been a long time since I have had extending listening sessions with head/earphones. What is popping out for me as a loudspeaker listener may not be as noticeable for a daily headphone user .
Last night I got around to charging my RSA Hornet, hooked it up to my Clip, Rockboxed 5G and Nano 2G for a listening session.
The Nano was the third to be auditioned and was disappointing as a source compared to the other two. Using a mix of AAC, ALAC and MP3 it was rolled off on both ends, the midrange was sucked out and overall presentation was veiled. I tried plugging the JH5 into the headphone out of the Nano and I would rather use a set of earbuds to add some coloration to make it more musical. I unplugged the Nano and sent it off to sit in the corner. This is not a dig at the JH5s- they are just revealing and not a good match with the Nano 2G.
The burn in time for the JH5 helped significantly when listening to the Clip. During my first session, Paul Desmond's alto sax solo on Take Five had a honky and shouty coloration. After the burn in the coloration was replaced with a more musical presentation.
On "Ceremony" by New Order I realized after twenty years that I listen to the guitar line and not the drums. The JH5 is fast when following the drum impact and each tap on the cymbals is defined. I found a new way to listen to an old favorite song.
The JH5s are revealing. On older recordings I find the tape hiss a little more pronounced, but it does not bother me. It is like ignoring ticks and pops when listening to vinyl.
The first time around listening to "I Can See Clearly Now" by The Holly Cole Trio the upright bass had a single note, muddy, tubby quality. Holly's voice was shouty and forward. After the burn in , the upright bass tightened up and the individual plucking of the strings was more defined. Holly seemed to take a few steps back and mellow out.
All of this on just the second day of having the JH5 Pro. I have found that good musical audio gear whispers to you like a drug dealer-"Just one more, one more song is not going to hurt you" and less than lovable gear is a relief when you turn it off your system.
Last night I stayed up til 2 am listening to "one more".