I haven't seen this 16Khz spike on my mkh40/30 combo. I'm pretty sure
this is not typical. It is odd that its happening to both of you
though,..
If I was sure the sound wasn't environmental and I could produce it
with two different recorders (one, a "pro" standard might help your
cause) and two sets of mic cables, I'd pick a slow week and send the
recordings and sonograms on CD with both mics to Sennheiser. Their
repair prices here in the US, at least, are very reasonable,
especially if a component has failed. They'll test the frequency
response of both mics and send you the charts.
Richard, if the left channel of your firecrest recording is the
mkh-30-- the louder of the two channels-- this seems inconsistent
with my pair where the 40 usually produces more saturation due to the
extended low end response compared to the 30. Rob D.
Richard wrote:
>
>Actually I have been chasing something similar, and I have come to the
>conclusion that I accused the thomann phantom unit unfairly. My MKH
>30/40 are now
>powered off 6 8.4V batteries in series, with a diode drop of .6V to be
>about 50V. Within Sennheiser's spec of 48V+/-4V.
>
>I was recording a firecrest in a bush, and this is a quiet sound, so
>the HiMD was flat out. I have posted the raw recording and a sonogram
>on
>http://www.suffolkbirds.co.uk/article/49/mkh-hf-noise-blues-firecrest-in-a=
-bush
>and there really does seem to be a lot of 17kHz wideband noise,
>particularly on the MKH30.
>
>I have got this down a bit by soldering jump wires from pin1 to the
>shell tag on the XLRs, but it appears to be very much like Steve's
>issue. Am I asking too much of these mics - would you normally expect
>the noise floor to exhibit a band of HF noise like this? No TVs within
>100 yards, no computer at all, car ignition was off, not overhead
>power lines. There is a coastguard station about half a mile away with
>a VHF marine radio, but the 18kHz noise band is replicatable at home
>20 miles from the recording site, just harder to see in the ambient noise.
--
Rob Danielson
Film Department
University of Wisconsin-Milwaukee
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