In 1985 I had these wide baffle boxes into the Technics "rack" setup.
https://www.ebay.com/itm/RSL-Rogersound-Lab-Speed-Screen-SpeedScreen-Speakers-Pair-Good-Condition/30...Replace the passive radiators, good as new.
Got rid of mine last year,which were mothballed for some 30 years.
Attached them with zip cord, fabulous faux fi!
I hooked them up before letting them go, they surprisingly performed pretty good with my current tubed rig.
Made in Canoga Park, Ca. Weighed 60-70lbs. Made the so-so rack system ROCK. Especially with those still new CD's. Rarely used the plasticky linear table.
Pre Sonus Faber Elipsa/Stradavari- poor man style.