Thanks for the response and advice. I will take a look.

I've personally built both versions of xover and they are so bright I couldn't bear.

I think there are two basic flaws with the xover design:
1. The xover frequency is way too low @about 1750hz and this is where the excessive sibilance and harshness come from.
2. The capacitor on the tweeter is too bigh. The bigger the cap, the more it influence the sound in a negative way.

With the help from someone I had contacted from the Netherland, we have come up with a brand new xover the will cross at about 2.4Khz and the cap on the tweeter and woofer both reduced significantly.
The sound with the new xover is much more musical and relaxing without compromising much in term of transparency.

If you want, you can email me for the new xover version.