I just think EX1000 has a very bright treble but not quite refined. It won't bother me if NT6Pro has a very bright treble. But it will annoy me , if NT6Pro sounds unrefined.
EX1000's harshness is also due to its thin midrange. Imagining of EX1000's midrange also isn't good enough. I guess NT6Pro's midrange and treble won't be worse than those of EX1000.
I keep ratings of quality for each part of the spectrum and the EX1000 scored a 38/100 while the NT-6 and NT-6 pro both scored 95/100, so I would think you are fine. But, the sound signatures do share some characteristics as a word of caution, but the Hidition products are much more technically competent, including bringing out the worst in poorly mastered tracks (although not as much as some others such as the IERM).
average_joe, I'm not sure if you've read the headstage arrow thread, but apparently the 4g's output impedance is 3-5ohms. It is pretty high for CIEMs, did you experience any significant changes in sound signatures when using the 4g? Curious as it didn't seem like you didn't have a problem with the UE IERMs and arrow 4g.
I have used a 4G in many of my recent reviews. The amp is generally different in sound sig than all my other amp as it has a wide presentation that doesn't have the best depth and is on the warm side. There are adjustments for the treble which do work well. I do notice deep bass rolloff, most likely in part due to the boosted mid-bass that adds the warmth, which makes the deep bass seem less substantial. I also have a full review in my multi-amp thread if you haven't seen it.
Both BAs and dynamic drivers have different limitations, and this is a complex subject when you really get into it, but multiple BAs typically result in better dynamics and extension.
I don't recall Hidition ever mentioning that; is that what you were told? The three sound tubes would seem to be much easier to fit than the 5 in the SE5.
Ask Sony :) Dynamics, headroom, bandwidth? Maybe the manufacturer can answer that one.
From what I understand, the CK10 used a TWFK without a crossover with great success, and had excellent bass depth and good treble extension. Maybe tomscy2000 can verify.