<<i also use a mkh30/40 combination, but with the sound devices 702.
and i often record VERY subtle sounds. and i always have a Hiss on my
recordings. Sometimes i also record
room tones, which is recording a silent room. then you definitly hear
this hiss. seems to be a sennheiser issue, >>
No, it is really a physics issue. All electronic circuits generate
noise, what you're calling hiss. Microphones are particularly noisy
components, compared to the linear amplifiers found in the remainder
of an analog circuit. This is something we're stuck with, & has to do
with random motion at the molecular level, as opposed to something
just waiting for constantly improving technology to find a cure for.
<<NOT a preamp issue, as i had this with different mkh mics and with
different mic pre amps.>>
Preamps, especially at high gain, add their own noise to the mic
noise, but the mic self noise will predominate.
<<or i just was unlucky all the time and had broken mkh mics, bought
new but broken mkh mics, or i=B4m making something terrible wrong...>>
The Sennheiser MKH mics are exceptionally quiet, in fact 4 to 6 db
quieter than the well regarded equivalent Neumann & Schoeps models.
<<when i have time the next days i will load some sounds up, and start
a new topic on this.
the mkh mics are really great, but this bothers me..>>
One can use quieter mics than the Sennheiser MKH series, but major
inconveniences result. For example, the Neumann TLM103 is about 5 db
quieter than the Sennheiser, but is a large diaphragm model, which
would be extremely unwieldy for location work, suffers, as do all
large diaphragm designs, from off axis nonlinearities, & is far from
neutral in its sonic characteristics. The real solution to your noise
issue is to obtain a better signal to noise level in the acoustic
realm. I.e. get closer to the quiet source so the transducers have
more acoustic signal to work on.
Scott Fraser
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