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Dear list, Would anyone have measured the attenuation
characteristics of a double-wall sound proof booth once the booth is installed
on site, compared to the characteristics announced by the manufacturer? I’m having a booth built, and after
several installation attempts (by the manufacturer), I still don’t get
what was announced. Basically, they announce an attenuation over 90 dB above 1
kHz (which is huge), I'm getting 70 dB (which is quite good, but still 20 dB
less than what I’m paying for…), and the manufacturer says:
"that's fine, that's what we normally get for measurement on site". The reference measurement giving over 90 dB
is supposed to be done in a reverberant room (so, same sound level all around
the booth during the measurement). The room where my booth is installed might
not be as reverberant; but I’m doing the measurement with the microphone
between the sound source and the booth, so on the worse side of the booth. So I
anticipate that, if my room was perfectly reverberant, I would get equal or smaller
performances… I would like to know if I'm getting what others
are getting or if I should keep on complaining. Actually, very soon the
manufacturer will not have any proposition for improvement (they told me
already) so I have to decide if I keep the booth, or if they take it away and
I'm looking for somebody else to build me a better one… (I haven’t
tell the manufacturer name, but it might be difficult to find a better known
company in the field…) Thanks in advance for your advice, Mat ----------------------------------------------------------------------------------------------- Mathieu
Lavandier Rue
M. Audin, 69518 Vaulx-en-Velin Cedex, FRANCE |