That is somewhat of an over-simplification, of course, but the general rule does apply. AR-KLH-Advent chose bass extension and a small enclosure at the expense of efficiency Klipsch chose bass extension and efficiency at the expense of enclosure size. The downside of course was their huge size, since they were subject-like all speakers-to the “Iron Law” of acoustics, which stipulates that when considering Enclosure Size, Bass Extension, and Efficiency, you may have any two at the expense of the third. Klipsch speakers played clean and loud with minimal power input, and neither the speaker nor the amp was being pushed into distortion. For an Advent to play at 105dB it would require an input of well over 100 watts, which could be far beyond the undistorted instantaneous capability of the typical 50 watt/channel receiver with which 1970’s bookshelf speakers were usually paired. Compare that to the Klipschorn’s 105dB 1W/1m rating. The typical AR-KLH-Advent acoustic suspension bookshelf speaker had a system sensitivity of about 87dB 1W/1m on axis. Professional speakers owe a debt of gratitude to Paul Klipsch.Īnd the Klipschorns are certainly efficient, no question about it. Today, the few remaining home high-efficiency designs and virtually all
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