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NaTCH Engineering  

 

Test Spaces

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Environment

Email:

web@NaTCH.co.uk

01728 723306

Phone:

01728 723306

Fax:

0871 247 4524

Pester:

07970 865730

2 Station Terrace

Framlingham

WOODBRIDGE

IP13 9EF  UK

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Lines of steep and shallow slopeAs it says on our mike position page "Forget all about 1 metre on axis".  When development measure a loudspeaker they have an anechoic chamber in the hope that it will give a repeatable free field responses  The free field response gives you some indication of our how a speaker will perform in different environments; but when comparative testing you're only concerned how alike are the test unit and the reference.  Keeping this in mind the considerations for a production test unit are:

quiet enough to allow the operator to function,

at least as stable as your longest re-calibration period,

and not necessarily approximating anechoic but see the next paragraph.

It helps if the environment doesn't put points of steep slope in the response.  As a slope becomes steeper the change in y increases for the same change in x.  If the environment makes a slope in a unit's response look steeper then differences in that region will be emphasised.