Primacoustic MaxTrap

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Primacoustic MaxTrap

Postby Bob » Wed Sep 11, 2013 8:52 am

Just wondering what everyone thinks of
http://www.primacoustic.com/maxtrap-science.htm
(both the page, and the device)
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Re: Primacoustic MaxTrap

Postby bert stoltenborg » Thu Sep 12, 2013 6:24 am

Lots of words, maybe I read 'm all later, but when they compare low and high frequencies and they say low has more energy they seem to forget that in the time one low cycle developes, a load of high cycles already have developed. So the energy is equal.
High frequencies normally are bundled and beamed by horns and line arrays while low is omni directional. So low needs more power, unless you use an enormous amount of low freq speakers like Stage Accompany did long ago during a Vangelis concert at the shores of the Maas in Rotterdam (it was the Eureka concert in 1991). The used 500.000 Watts of Blue Boxes for a 275.000 headed audience.They needed very little power in the lows compared to the highs.

And a tuned absorber still has high Q, so it will do (almost) nothing for other frequencies than the tuning frequency, and damping it to make it more broad band will kill it's effectivity.
Maybe they try to reduce costs at Riverbank and hired some Mexican techs who never saw measurements before? :mrgreen: :mrgreen:
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Re: Primacoustic MaxTrap

Postby Ido » Tue Sep 24, 2013 9:05 pm

it's funny how after all these years I can still get annoyed by these things.
the data for 3" wool is incorrect (from memory) and serves potential bias.
the light density=minimal LF absorption is as we know highly inaccurate.
the way of showing those resonance peaks is like propaganda.
the british have been doing these limp mass LF sorbers for dozens of years, maybe all the techs there fainted so hard they passed all the tests to riverbanks so they could faint too
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