At your own risk.
How would a binaural pair of GDM311 touching the ears while recording sound like?
The Grundig GDM311 have the following advantages:
They are omnidirectional.
Are the capsules made by Sennheiser?
They are small and white, light colored.
The diaphragm is large, therefore high output.
The impedance of the capsule seems to be low like an SM57 capsule, is their impedance 10-20ohms? This means there are few turns of wire on the voice coil and it is lightweight therefore it can easily accelerate. Force = mass x acceleration. Acceleration means high frequency detail.
Their profile is small and thin so they can be worn like headphones in order to make great binaural recordings.
Their housing contains an auto transformer that steps up to 200ohms on one pin of the 3 DIN and very high, 200KΩ?, on the other pin. The step up ratio must be very high x90?
So they be directly connected to the Pleiades V4 grid for example through the usual capacitor.
There are inexpensive.
The low primary inductance of the transformer (10mH) compensates the bass increase due to Fletcher-Munson and voice effort curves. So the sound is almost there without the need for EQ. For example on world class microphones such as MD21, D130, 635a a Pleiades filter of about 82mH was needed to reduce mind perceived bass prominence.
A disadvantage may be that they could sound a bit more smooth but this may be improved by winding a Pleiades step transformer.
There is also a variation called GDM18, they look the same, to what extent do they differ?
On a mono setup one was tried so far on the Pleiades V4 with its EF183 operating with just 3 volts on the anode. The detail and sensitivity was such that one could hear ambient sounds dozens of meters away.
Mono setup:
GDM311 - Pleiades V4 - Realistic disco mixer mic input - Sennheisr HD580
It should be fun recording with 2 of them placed next to ears like headphones but pointing outwards and driving two Pleiades V4 electron tube pre preamplifiers of extremely low noise figure.
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