I will have my technician confirm the value next week.
While we wait, I'll opine...
Actually, I am rather pleased with the sound. It is fast, transparent with decent bass.
If it ain't broke...
If I have to say to improve, the sound sometimes can be little bit bright with some sources.
OK, we have a goal/direction. However, I see a problem changing XO components. The Supreme Silver/Gold/Oil that is supposedly installed is very warm. Most caps would be brighter. Do the SGOs have weakness? Sure, but none could contribute to your complaint. Further, a warmer/richer cap would be very large. Too large for the cabinet. You would have to go external XO. Given your general approval of the speaker now, such money may be hard to justify. A coil will not help what you have listed.
I had my technician upgrade the amp with resister, step attenuator, WBT RCA and bidding post. I think it is a good idea to do it at the same time.
Binding posts might be nice, but use something that takes you in your desired direction. If the resistor is not jumped, I would consider replacing it if it is a film type. I find them nasally sounding. It does not directly apply to your complaint, but would help with the final solution. What is the final solution, I do not think it is in the speaker.
I think you could do more with your integrated. You could use some warmer diodes in the PS. I see a couple of red (wima?) coupling caps? Also, you could do better with your speaker wire. As in more conducive to the sound you are looking for. What does your room look like?
