My PSB Century 600i Speakers

I have a pair of PSB Century 600i speakers I bought quite some times ago. It never sounded right to me. The sound is small, laid back and not very clear. But all the reviews says they are good speakers. I don't understand why my is not as good. Finally, I decided to open them up and take a look. I found three issues.

1. This is a two-way speaker. PSB uses a first order low pass and a 3rd order high pass. The low pass is at 1.5k and the high pass is at 3k. This creates a big dip at 2.2k (4dB). I guess that explains why it sounds "laid back". So I made a 3rd order low-pass crossover at 3k to flatten the response. (Another problem with 1st order 1.5k crossing point is that it may make the speaker distort. speaker like this, 6.5 in woofer, normally has a response up to 4k. With this change, the sound is much "front" and bright.
2. the crossover uses those small electrolytic capacitors. After replacing them, the sound is much clear.
3. It uses fiber glass as damping material. But they are not on the wall but stuffed in the middle of the cabinet. This is a reflex type of box. I read box like these need empty space to let air flow. But walls need to be damped. So I moved all the fiber glass to the wall, put some foam on the wall behind the speakers. With these changes, the speaker is much "big" and the low is coming out. The "dry" sound in the mid-high is gone too. 

With all these changes, my speakers sound much better. I understand why PSB uses 1st order low-pass and cheap capacitors (well, maybe not. This is a $400 speakers/pair, adding another $20 to the cost should not be too bad). But I don't understand why can't they make the damping right. No extra money required only a bit of care.

Anyway, I can enjoy my music now, finally.