reading microphone polar and freq. charts

Posted: Tue Apr 18, 2006 3:52 pm

hello there.

if a handheld vocal mic has a polar chart like this one
http://www.audio-technica.com/cms/wired_mics/b8f2c39b7aa5fc9c/index.htm

is it not giving a false reading off its off axis rejection as it has an added ring (worth 5db's) i.e. at 120% and at 1kHz the mic is not 30 db's down but in fact 25? because with the added ring your not actually counting from directly behind its on axis point at 0%

if so it it the same case with this mic

http://www.audixusa.com/Acrobat/OM5_spec_sheet.pdfl

at 2000Hz the mic isnt down by 30db's but 25 for the same reason as the first mic?

thanks

Posted: Tue Apr 18, 2006 3:59 pm

oops i dont think the links i put up work!
the first mic was the audio-technica ae6100
which can be found at

www.audio-technica.com

and the other was the audix OM5 and it spec sheet can be found at

www.audixusa.com

thanks

Posted: Tue Apr 18, 2006 11:46 pm

I'd assume the second line is the zero reference.
Wayne

Posted: Wed Apr 19, 2006 3:40 pm

AE6100
Hypercardioid Dynamic Handheld Microphone

it shows the relative sensitivity at various frequencies and positions around the capsule

most sensitive directly in front and at all the freqs
least sensitive at 1k at both 120 and 240 deg

looking at the back of the mic is difficult to gauge the other freq because they have use the dotted line and not continuous coloured lines

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