Stacked Large Advents v Cornwalls v Klipschorns

I have not heard the Advents, but have owned Cornwalls, Khorns - and La Scalas. 
Generally agree with roxy54. Of the three, for my systems the La Scalas just didn't deliver. The Cornwalls were quite good and were all original. The Khorns were on a different level. However, I should mention they were quite modified; new tweeter, squaker and crossovers. Also, with the help of a friend who was into Klipsch, they were sealed to the walls. Those speakers, driven by Wavac MD300BM mono blocks with Western Electric 300b tubes putting out 10 beautiful watts, sounded fantastic!

I fell asleep on the Advents, But then I WOKE UP with the Klipsch!!!!
It's just something about that HORNY HORN'S.

Had all 3, in the order you have them listed. The Advents were superb back in the day. However no match for the Cornwalls, and certainly not for the Khorns. As mentioned above, your room is critical for these speakers to sound right. And what you power them with as well. Hint- Wil Vincent from Autospec is selling a Baldwin modified amp here, One of the best sounding amps I heard with the Khorn. 

There is no contest. When I was a teenager in the 70's my older brother was sold on Advents. I challenged him to an A/B test with my Klipschlike Fraisier IV's..They blew his Advents out of the water. He went and bought a pair Heresy's the next day