I was using a bit more Dynamat than you did and initially I had the impression that it cleaned up the bass a bit, but after a while I had to admit that this was just something I 'wanted' to hear. So, as far as I am concerned I would say it does not seem to be really effective.

Something like that happens quite often to me. Right after a mod I am happy with the result, only to realize a day or so and some prolonged listening later that the mod wasn't that much of an achievement after all and only then my brain gets really sensitive to the weaknesses again. And this is also the reason why I like to 'see' the effects of mods reflected in my measurements.

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