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Old 01-02-2010, 08:58 AM
geokie8 geokie8 is offline
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I think it's possible to get a general indication of the K10's loudness with the Max SPL rating. Using those figures, the QSC seems to have an efficiency rating less than the JBL Eon 500 series but with quite a bit more power. Those engineers familar with the actual formula can correct and/or refine the following.

The JBL 510 is rated 220 watts (LF power amp) with a Max SPL of 121 dB. The K10 is rated 500 watts with a Max SPL of 129 dB. Since 10 dB is twice as loud, the K10 is 80% of twice as loud (if you will). Another real world type of approach: Since an increase of 3 dB is noticeable to the human ear, the K10 has almost three additional levels of perceptible loudness.

A comparable 80% increase in the JBL's power would be 396 watts (220 X .8 + 220); therefore, the JBL is definitely a more efficient speaker (i.e., if you put a 500 watt amp in the JBL, theoretically you'd end up with a Max SPL rating closer to 133 dB).

Bottom line: Although not necessarily a better speaker, the QSC is a louder speaker if you require the additional volume for your band and/or venue.

geokie8

Footnote: The K8 is rated 127 dB, and there will obviously be a falloff in the lower frequencies; however, JBL doesn't make an 8" speaker in that series for comparison.
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