- Feb 14, 2008
It's only important to the mixers preparing the deliverables. It's irrelevant to consumers. I got confused by this when I first looked into it too.
Most of the time it should be irrelevant to consumers. The two exceptions are when consumers manually calibrate/play with the sub and in the case of SACD, where the ".1" is not +10dB in-band gain.
 The selected quote I used was to show my reading comprehension: which clearly states the LFE is calibrated at 95DB on the RTA.
 Gregorio then quotes a source saying "if RTA is not available"....and so then obfuscates the original topic.
1. Yes, unfortunately you did show your lack reading comprehension! Your quote clearly states the LFE is calibrated to 95dB on a band-limited RTA when your main speaker is calibrated to 85dB on with the same RTA. IE. When the main speaker is calibrated to about 89dBC on an SPL meter, which it should NEVER be, NOT even in a cinema (where it should be calibrated to 85dBC on an SPL meter) and certainly not in a home/consumer environment, where it should be calibrated to 76-79dBC!
2. Gregorio then quotes the publication by Dobly themselves on how to calibrate the LFE output! Which provides the rough level of the LFE output relative to the level the main speaker is calibrated to. Maybe you just don't understand that's what the +10dB is refering to? It means 10dB higher than the calibration of the main speakers (which is 85dBC for cinemas, not 89dB!), resulting in the sub/array having an output level of roughly 91dB! Why don't you "show your reading comprehension" on that?!