The first large and powerful speakers that I bought were the Altec Stonhedge III's. Each white oak box had a single Altec 604-8g, which is a 15" woofer with a coaxially mounted sectoral horn.
I remember taking them home in 1975, at 3'10 tall and 115lbs apiece, this was not exactly an easy thing to do with my Plymouth Gold Duster, but they made it in one piece. One just made it across the back seat and one was sticking out of the trunk.
Shortly after buying the most expensive speakers under the sun, (although I can't remember if they were $600 apiece or for the pair), I invited over for the first and last time, a guy who called himself an audiophile.
He described their high freq. as, "so sharp that it could cut off your nose" and I was absolutely devestated.
When he invited me to hear these Magnaplaner panel things, I could not believe how incredibly good they were compared to what I thought was probably the best speakers ever made!
Eventually, I managed to buy my first pair of Magnaplaners and I've owned only Magnaplaners, in their various iterations, for the next 25yrs.
It's only been a few years since I've been listening to and owning box speakers again but I've held onto these Altecs of mine. Call me sentimental, or is it just...mental?