I can't claim to be an audio expert but I appreciate good sound. When I "upgraded" to my present system about 20 years ago I was talked into some DQ-20's instead of the Larger Advents that I was going to get at the time.
Two years ago I picked up some Larger Advents very reasonably priced and hooked them to the Monster Cable in place of the DQ-20's and in the exact sonic environment.
At first I saw no discernable difference but then I began to notice things that I had NOT been hearing on the Dahlquists. The more I listened across our eclectic collection that ranges from the hillbilly yodels of A. Tippin to Sinatra and Muldaur, from George Winston and the incredible diction of Streep to Loreena MacKennitt and John Anderson, from The Who and much Glimmer Twinz to Led Zep's incredible 5 [and even a few old Yardbirds] to Wagner as interpreted by Furtwangler, Flagstad and others more modern, to Josh Bell and Cash and Waylon and Willie and Big & Rich...
Anyway, you get the picture, our main speakers get played at a lot of different volumes and with a lot of different material. And across this diverse range I keep "discovering" things that weren't there with the DQ-20's. And no, my ears are not getting better with age ;^)
So cutting to the chase, I see that you keep up with the technical stuff and I wondered if you would explain why the Advent Heritage isn't as desirable as the old Larger [and Smaller] Advents. I am going to put my pair of DQ-20's on eBay and set up the dual Advent system so I need to know which years/models of the various large Advents would be best for this.
Thanks much in advance for any advice anyone can offer here; I am using a Sumo Polaris amp and a Sumo Athena pre-amp.