Help with finding a compatible headset microphone for E-Prime SRbox

[David McFarlane]

Actually, based both on my own tests and 
information I got from PST Support, the SRBox 
takes input from a dynamic microphone (using, as 
already noted, a two-conductor tip-sleeve 
connector arrangement).  The dynamic microphone 
provides a weak "mic-level" signal, and the SRBox 
then supplies any required preamp or amp 
stage.  If you put a preamp between the mic and 
the SRBox, then you will boost the mic-level 
signal to line-level, and this will almost 
certainly overdrive the input to the SRBox.  Not what you want.

So you need an unbalanced, non-powered microphone 
that produces an output signal at about the same 
level as a dynamic mic (see the Wikipedia article 
on microphones if you need background info, this 
gets complicated!).  I have no idea what headset 
mics would provide that, but perhaps armed with 
this technical info you can contact a local sound 
engineer and they could steer you in the right 
direction.  And when you get an answer, please 
post it back here for the rest of us!

-- David McFarlane


At 4/7/2014 12:33 PM Monday, Michiel Sovijärvi-Spape wrote:
>Hi,
>If I remember correctly, one needs a microphone 
>with pre-amp; I suspect you might well get good 
>results with even a fairly low quality headset 
>microphone - weâ EURO (tm)re not really talking high 
>fidelity audio capture here, as long as the 
>signal is higher than the noise. Thatâ EURO (tm)s of 
>course the issue with soft-speaking 
>participants: if their breathing is about as 
>loud as their voice, itâ EURO (tm)s not going to become 
>brilliant even if you tweak the sensitivity of 
>the SRBOX (thereâ EURO (tm)s a thing or two about in our 
>E-Primer). Another thing thatâ EURO (tm)s often only 
>clear once youâ EURO (tm)re halfway through your 
>experiment, is that the onset of vocal audio 
>differs drastically depending on the word; so if you have a Stroop test,
>â EURO oePurpleâ EURO , has a nice, loud onset with the 
>popping P sound (annoying for audio engineers), 
>whereas might only register at the â EURO oeDâ EURO .
>
>Well, itâ EURO (tm)s been a while since I last did 
>anything with the voicekey, please do let us know what your experiences are!
>Best,
>Michiel SpapÃ(c)
>
>From: e-prime at googlegroups.com 
>[mailto:e-prime at googlegroups.com] On Behalf Of Alain Desrochers
>Sent: 06 April 2014 14:12
>To: e-prime at googlegroups.com
>Subject: Help with finding a compatible headset microphone for E-Prime SRbox
>
>With the purchase of an E-Prime SRbox I received 
>an Audio-Technica microphone (Model ATR20) with 
>a desk stand. I am now looking for a headset 
>microphone model that is compatible with the 
>2-pole plug of the SRbox. Has anyone in the 
>E-Prime user community found such a microphone 
>model? Also, in your experience, does a headset 
>microphone resolve the problem of capturing 
>responses from participants with a very soft 
>voice? Thank you for taking the time to share your recommendations with me.
>
>Alain Desrochers, School of Psychology, University of Ottawa, Canada

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