It looks like DEQX does a better job than YG. Am I missing anything?
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Optimal phase and timing correction can only be done in the digital domain. All dynamic drivers are subject to these errors, and there is no conventional crossover or driver design that can correct this to the extent that digital correction can. That's one of the reasons why DEQX will enhance the performance of any speaker.
08-27-14: Psagtrue if you have reasonably good drivers that need correction to make them sound their best.
OTOH, if you have superlative drivers that are already linear between the frequencies they are crossed over then DEQX will not add much at all.
All depends on the skill of the speaker designer - the better ones don't need DEQX; most of them do.....
According to other posts about drivers, and info on the DEQX website, there are no "perfect" drivers. "There are anomolies even in the very best drivers that result in the signal/driver interface creating 10 to 100 times or more the distortion in the balance of the reproduction chain ie record/cd player, cables, preamp,amp". I can't say I agree with that statement as I feel the average interconnects and speaker cables probably contribute very significantly to overall distortion. Does anyone have information to clarify that there exists a single midrange driver that has less distortion than i/c's or speaker cables? (This may be interesting.)