We bought a pair of Advent speakers in 1974. Buying two speakers housed in utility cabinets instead of the wood veneer and fancy woodwork cost $214 total. The Advents far surpassed the Sears Silvertone pair that I had since 1963. The larger Advent was a two-driver system with a crossover at about 1000 Hz.
Around 1977 after reading about the outstanding sound of stacked double Advents in The Absolute Sound
magazine, we bought an additional pair of Advents with the wood veneer cabinets. On the left and right we stacked the older and newer speakers with the low frequency drivers next to each other and one high frequency driver near the floor and the other in the topmost position. One-inch adhesive bumpers kept the speakers from sliding.
We enjoyed listening to this superb system with a Pioneer SX-3900 120-watts per channel receiver, a Pioneer CT-F1250 cassette deck, and a Dual CS5000 turntable. We used this system until the foam surrounds of the low frequency drivers rotted. Instead of replacing the foam surrounds, we sold them, and in 1991 we bought the original Cambridge SoundWorks Ensemble. Take a look at the Advent pics.