Hi Sampo,
   well the objective directional analysis we're discussing here was not of 
course, but yeah all of the listening tests on audio quality were naturally 
double blind.

In terms of the TetraMic, our experience was that in general the output from 
this mic was a much lower level signal, compared to say the Ambeo. So, my 
original point was not really that the Tetra is noiser, just that it requires 
more input gain compared to some other mics, which places more demands on 
whatever mic preamps are being used. And yes, I'm just referring to program 
level overall noise.

In our test, the mic preamps were quite modest (the MOTU 8m) although still 
fairly representative of the types of mic pres often used with these types of 
mics, hence the issue. So, as John also mentioned, when using the TetraMic with 
modest mic pres (such as a Motu, or a Zoom portable recorder), noise can be 
more of an issue with this mic compared to some others, but using better mic 
pres (such as the Metric Halo) much less so. To me this is something important 
to be aware of.

Steven, although it arrived too late to include in our tests, to my ears, the 
new Ambeo plugin greatly improves the high frequency response, so I'd 
definitely recommend trying it out.

Thanks for the offer Gerard, I'll let you know if we do ever plan on doing more 
tests like this.
enda

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