Quote:
Originally Posted by
Dayter 
But this is at just 1 meter apart , and according to the
Inverse square root law , doubling the distance form the speaker looses 6dB loudness.
The inverse square law is correct in an an-echoic space. Your listening area is not likely to be one.
I refer you back to post #7 by me "you'll loose 3db-6db everytime you double distance."
Quote:
The equation does not stop at this point , as all these calculations are made for just one (mono) speaker , but by adding the other front channel as working in stereo mode , would yield +3dB increase in loudness , therefore the final subjective Loudness level would e 99dB , which is far away from reaching the reference benchmark .
Actually: if they are close enough to sum it's +6db. You gain +3db for efficiency and another +3db for power-handling.
But that assumes that they are putting out the same signal. It would apply to a mono source to dual speakers.
Quote:
Originally Posted by
Bill Fitzmaurice 
Further, the speakers maximum rated power is a thermal rating, which may be as much as twice what the drivers are actually capable of handing before they reach their excursion limits and distortion becomes unbearably high. For these reasons don't count on getting more than 20dB output above the 1w sensitivity,
Quote:
Originally Posted by
Bill Fitzmaurice 
Power compression has little effect on peaks.
So, let's go back to "reference level"
" Reference Level, 85dB SPL with 20dB of headroom." -
http://www.thx.com/consumer/thx-technology/thx-reference-level/
So when we discuss 105db, we are discussing peaks, which Bill has said are "little effect[ed]" by power compression.
Quote:
and that assumes the 1w sensitivity rating is accurate. Unless you see an actual measured response chart it probably isn't.
We are talking about Studio 60s? -
http://www.stereophile.com/content/paradigm-reference-studio-60-v5-loudspeaker-measurements