Wayne:
You're absoultely right! Doing the fequency response measurement seems to be very beneficial for me too. I'm grateful that you've provided such a great & detailed explaination to me, now i know what i must learn to do.
As for this measurement to be done, i'll hunt for the mic & install those software. Hopefully i can get it done asap & report the frequency response result to you.
While looking for this measurement tools, i covered the Visaton B200 with some book while it's playing & realized it sounded better, therefore i'll try to swap to different driver to substitute the Visaton B200 temporarily and see if that's the cause of this problem.
As for bringing the speakers outdoor, it will be tough for me as it's currently at my attic floor and it's quite heavy.
Thanks so much, Wayne