Over the past few months I have been slowly swapping out the stock components in my Belles with Crites'. I first added the the XO, then the cast woofer, then the A-55G squawker, then CT120 tweeter. Some completely non scientific and random observations below.
The woofer was the most difficult to install for obvious reasons. Also because someone decided to add glue to the mounting hardware. The originals were square magnets.
The woofer was very mechanical sounding at first. It took a couple weeks before sounding like music again. However, the added efficiency of modern driver through the entire balance out of whack. I did not like the sound very much with just this component swapped in.
The squawker was obviously a very easy installation: 4mins total.
These again increased the efficiency of the Belles. They are louder. They are also more analytical; a hair bit of smoothness is gone. Vocals are very crisp. I feel the crossover point between the woofer and squawker is more filled in. There appears to be no dip at all in frequency response (not measured, just listening).
Using the modern compression driver with the modern woofer is a great match for my Belles; I funded the added low end smooths out the more forward midrange on the music I am most interested in.
The tweeter on the Belles is pretty easy to get at, as the entire upper half can slide out once you back off 4x screws. Cant imaging the LaScalas are that easy to access.
The new tweeter is amazing. It is much better than the CT125. It really keeps up with the entire new component compliment. Everything this sharper and more defined. The stereo image is crazy tall and wider than with the stock (K-77 alnico) tweeter.
Overall, I am very happy with the upgrades. These Belles are kinda beat up on the outside, but with 100% new components they sound modern and fresh. They are insanely snappy and dynamic. They are loud; the only drawback being that I may have to consider getting a lower powered amp as a result... I think the most important piece to remember is, in my option, none of these can happen on their own. I feel they must be done all or nothing. Putting back any of the older components, resulted in a serious lack of keeping up with the newer drivers.