Woofers horn loaded. Lascalas are not known to have deep bass responce design was for sound reinforcment. Maybe a k-horn would be better choice for you. I never enjoyed my time with lascalas. You might want to research horn loading on audioasylum. I dont have the space or time in forum to fully explain it to you.
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I have been told that the woofer faces forward right into the point of that triangle. I have never seen it.
This is not correct. The 15" driver faces the back of the speaker cabinet, away from the point of the triangle. The point of the triangle is where the magnet for the driver is located. You can see a picture of the open interior of the speaker here. Follow through on all of the pages in that link to see some pretty nice refinished LaScala speakers. I think this guy still does the refinishing.
Per previous responses here, the LaScala does not go low on bass and the Khorns definitely are better, especially if properly set up in corners of a room in an appropriate configuration. The LaScalas drop of steeply at around 50hz. They do midrange very well indeed. The tweeter (K77) leaves a whole lot of room for improvement - Alternatives by Beyma and Fane are better in my experience with that speaker. You can put a better bass driver in the cabinet and may get slightly better low-end resolution, but I don't think you'll get it to go any lower as the limitations are largely with the folded horn. Much more specific info on this stuff on the Klipsch forums.