GravityBored

I have a set of 1973 La Scalas that are new to me. I also have a set of Cornwall 1's. Rebuilt the La Scala AA crossovers with a kit from Crites. I didn't see much in the way of tutorials online for the AA, but I wired them exactly as they were with the originals and compared to reference images I could find online. I replaced the K77 tweeter diaphragms, so they appear to be fully functioning. Cornwalls have Crites crossovers. Here's my issue. The La Scala sound terrible compared to the Cornwall. The midrange sounds like someone singing down a tube and some distortion. I've messed with placement and toe-in. I also tried the same placement as where I had the Cornwalls. The room I have is about 20x15. I've never heard La Scalas before, but I can't imagine they are supposed to be this bad. My assumption was that the La Scalas would sound very similar to the Cornwalls with less pronounced bass and a better midrange. Can anyone take any guesses as to what's going on?