почему же?
:-)
вот офишал вершен:

JBL would get its foot in the door of the broadcast and studio segment of the professional market in the 1960`s as well. As in the cinema market, they would be up against their greatest rival, Altec Lansing. Altec had a lock on the studio monitor business with their 604 Duplex and A7. Were it not for a misstep of Altec in 1962, JBL may never have gotten the opportunity to enter and eventually dominate this market. That misstep was Altec`s introduction of the 605A Duplex. The 605 was introduced as the next generation Duplex and replaced the previous 604D. However, it`s primary development objective was cost reduction as opposed to improved sonic performance. The magnetic motors of this driver were significantly reduced in size compared to the preceding 604D. It resulted in a 3db drop in sensitivity in addition to subtle changes in sonic character. Industry response was entirely negative. Sales of the 605A dropped significantly in comparison to the 604D. It resulted in such a backlash, that for the first time, major record companies began considering alternatives.