I have the opportunity to have the HF5 for £50, but I think I will get the RE-400 now.
I once had the ATH-CK10, and I really liked them, only the treble was too much for me.
Any reason for skipping the PFE? Are the RE-400s technically superior?
Anyway, I have ordered the RE-400, I can not wait to hear them. :)
I just think the RE-400 is smoother than the PFE with the gray filters that I like.
I can get a decent seal with Comply P-series tips on them but sadly don't have a pair of those anymore.
That's pretty typical of dynamic drivers to be honest. The IE 800 does the same and the K3003 is somewhat more extended but still not completely linear.
I purchased some X10s since they had a good deal on Amazon. Needed something for running since the IQs connections seemed to cut out at times while running. I will have to see what the Klipsh X10s can do for bass extension. The X10s just don't compare to the Ultrasone IQs in mid and high range detail or tightness of the bass. They seem to have more bass but less quality. Doesn't matter much when working out because you just don't bother with the music detail as much.To me the IQs sound is more realistic in mids and highs. I tapped some cymbals on the drum kit and its pretty close for me. Listening to live music as well the IQs are pretty close to me.
I would be careful with the X10 for exercise use - the pair I had split along the seam on the back of the strain relief.