In the 1980s when new, these ran $2500 and even today, they still command $875. I FOUND THIS USEFUL INFO ON THIS ITEM: "The JSE Infinite Slope Model 1 speakers outwardly resemble many other speaker systems but embody two unique design features. The most obvious one is suggested by the term "infinite slope," which implies the use of steep crossover filters. Although not truly infinite, at about 100 dB per octave the JSE crossover slopes contrast sharply with the usual 6-, 12-, or 18-dB-per-octave slopes of other speaker systems. The advantages of using infinite-slope crossovers, if they could be realized in practice, would include: 1) handling any specific audio frequency by only one driver, thus eliminating the response irregularities and pattern distortions that result when two or more drivers operate at the same frequency; 2) reducing intermodulation distortion by eliminating bass frequencies from high-frequency drivers; 3) increasing dynamic range and power-handling ability, since the middle- and high-frequency drivers do not have to be designed to handle the high cone excursions imposed by bass frequencies; 4) eliminating "cone breakup" and the associated response irregularities that occur when a speaker driver is driven at frequencies above its design limits. Although the JSE crossover slopes are not really infinite, the manufacturer claims that all these benefits are realized in its products." THESE CAN BE QUITE HEAVY, PLEASE BRING HELP TO MOVE THEM HOME.

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