kimmosto
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You're absolutely right that I haven't shown or pretended respect if it's not earned in my opinion.He needs to act more professionally and be respectful of others around him especially in this forum where we have so many knowledgeable people contributing.
Everybody has an access to for example AES eLib to search the studies I have mentioned about timing. Lib is behind payment barrier also for AES members, but I can show a short summary what I have found and downloaded from there:
I'm know that this is not all, but until more information is shown, audibility was found when GD >= 1.6 ms. Just 3/7 was done with speakers, and probably just one with signal suitable for evaluating possible drop in dynamics due to delay at L.F.
Opponent has not yet referred anything, but I'm aware of paragraphs 4.8.1 and 4.8.2 in Toole's 3rd edition (I have it). He lists few more studies, partly done in reflective environment, but not mentioned in the book how large radiators and where, how much directivity, acoustics, distances. Effect of GD 1.6-2 ms is said to be subtle with addition "These numbers are not exceeded by normal domestic and monitor loudspeakers". I know that there are speakers on the market having double...tripple of that. One speaker had so long excess group delay that woofer's impulse did not properly fit into same time window of ca. 4 ms with tweeters impulse. Thousands of sold units already so what is "normal", and what is the limit which pays your attention? Is it "HF now and LF after few seconds" enough or what?
j_j wrote something like this: "Science tries to offers information with good confidence. Not truth". That statement and person is what I respect. So science does(/should) not try to prevent telling subjective experience, leaving possibility for further investigations and changes. As already written, most worrying is that existing references and conclusions are translated like an end game science which has offered final truth, and objectively measurable (audible) error will not be measured or published in human readable format.
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