I believe the large Advents were the predecessor to the new Advents. There was a change in the woofer of the new Advents and I believe the tweeter stayed the same. The original tweeter was orange in color and had a square plate that was mounted diagonally. The original large Advents had a 10 inch woofer mounted on a 12 inch frame. The new Advent did away with the 12 inch frame and was said to be cleaner sounding. I bought a pair of original large Advents in 1978. They had the 12 inch frame. When I went back to the store about 2 months later I was shown the new Advents with the changes. BTW i still have them packed away in a closet.
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