OK Zilch here goes.....keep in mind that I mostly listen to rock/pop/punk with some classical throw in to keep me honest. I have not listened to any classical music with them yet but now that I'm writing about it I'll do so over the next couple of nights.
HF: They are very open and spacious. I'm amazed as to what I'm hearing in songs that I never heard before. The detail and clarity coming from the speakers is not something I'm used to. Cymbals and high hats really come through, so much so that on several occasions I had to wonder what the sound was.

These are my first "Horn" loaded speakers using compression drivers (see pictures earlier in the thread) that I've used owned but I doubt they will be my last. I was of the opinion that horn loaded drivers were bright and shrill, mostly from listening to less expensive speakers. Not these or anything else I've heard at ZilchLab. They sound very natural and image well with a solid sound stage that presents depth to the music. The highs are so solid and clear that I haven't even touched the l-pads yet. Since there is a thread about accuracy in speakers I'd say the HF's are about as accurate as I've ever heard. I was originally going to use the BMS drivers but after hearing the 2452H-SL's I quickly changed my mind.
MF: Excellent with acoustic guitars sounding like they are in the room. As I already mentioned to Zilch I was listening to Led Zeppelin IV the other night and was very impressed listening to Going to California. Sounded like Jimmy and the boys were lined up across the stage right in front of me. Realistic and natural sounding. :yes:
LF: The upper bass is not as detailed as I've heard from some of Zilch's other creations or from the Revel F52 floor standers I heard over the weekend (these retail for $6,500 a pair). Zilch has suggested that I upgrade to some different JBL woofers but that's not in the budget for now. But it is still very solid with no boominess at all. Very clean sounding with the ability to hear each note from a bass guitar without thinking it's all the same note. These speakers hit surprising low (even though I know they are tuned to 30 Hz) and have usable bass lower than I expected. I have no problem rattling things in the room at moderate to high output levels. Very powerful bass considering the "vintage" LE14A's.
There is room for improvement here and I believe this is the area where we will be able to tune them further this weekend. Keep in mind that there is virtually no dampening material inside as well and I have not done anything to stiffen the cabinets yet. I did hear some rattling (a vibration) from the speakers sitting on the stands I made and I might use some Velcro to more securely attach the stands. I might even drill holes in the bottom of the cabinets and bolt them together. I'll post pictures of the stands when I take them to Zilch's this weekend. Maybe even some buck shot in the bottom of the cabinets as well.
One thing I would do differently next time is set them up to bi-amp. Zilch suggested that I do that but I originally thought it wasn't necessary. But after looking at several pairs of other speakers I own I should have done it anyway. It's easy enough to correct should I decide to do so later. I'd also build cabinets from scratch. These were a bit limiting since I wanted the ability to return the Barzilay cabinets to their original configuration down the road. Maybe I'll build new cabinets next summer.
Overall I'm quite pleased with my first speaker project but there's still a lot more to learn.