Compare Large Advent?

Most likely that Henry Kloss wasn't into the design at that time. The Large Advent was and still is the cream of the crop. When you get your second pair stack them with the tweeters close together (tweeter on top of the bottom speaker-tweeter on the bottom of the top one) You'll then hear things that you did'nt with just a single pair. The better the electronics the better these will sound!! I replaced my 1971s with 1978s (better quality assemblies)

For Moes Pizza,
Followup--You want the Large Advent. There's an Advent/1 but I don't think it's the same. Also, after you set up the Advents, remove the grill cloths!!! They get in the way of the music. If you haven't done that yet, try it--cleaner sound.

Does anyone else remember the short period during which Advent offered the "powered Advent Large Speaker?" I never heard them nor talked to anyone who had heard them, but I enjoyed my large advents. I played them with, alternately a Marantz 1060 and then an Advent 300. But the best sound I ever got out of them were when I used the 300 as a preamp and hooked up a monster mono guitar amp, just to see what they would do. Sounded great with the increased power. They like power.

The story I recall was that Henry Kloss became interested in video and was developing one of the first home-based front projection systems. He needed development money so drew on his design experience from AR and KLH and introduced the Large Advent. Due to the success of his Advent speakers, he is remembered for those to a much greater extent than his Kloss video system.

I bought a new pair of Large Advents in 1970 and by '73 had stacked Advents. My HK Citation 12 amp was not powerful and didn't like the impedance load so that was cured by building a Dyna 400 kit. I kept that system until about '80 and it was one of the best I've owned.

Was that guitar amp a Mesa Boogie by chance?