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Posts Tagged ‘Sennheiser ME66’

Rattrap

Posted in Mannlíf, Náttúra, tagged , , , , , on 14.6.2014| 1 Comment »

IMG_8664

This spring I got several young rats in my garage. They have probably stayed there some weeks eating the bred I used to feed the bird with last winter. Now when it was finished it was time to clean the garage of all mammals.
I owned a very nice mouse trap, a trap that would not kill the mouse. It was perfect for that job because the rats I had already seen had the size of a mouse.
It took just 15 minutes to hunt the first rat witch I put in a hamster cage.
It took eight hours for the second rat to reach the trap. During that time I recorded the whole progress in the garage on four channels. Two channels over the cage with the first rat and other two channels near the trap.
The following recording includes the moment when the rat got stuck in the trap and what happened when it realize the situation. Later on the rat in the cage starts to activate but during the night it was busy trying to find freedom.
Note: Do not play this loudly in the beginning. The trap is very loud when it pop the lock.

Rottugildra

Hér er á ferðinni upptaka af því þegar rotta er fönguð í búr, eins sem sést á myndini hér fyrir ofan.
Það var þegar búið að fanga eina og var sú höfð í hamstarbúri.
Tekið er upp á fjórar ráisr þar sem tvær rásir eru á gildruni og tvær yfir búrinu.
Athugið að spila upptökuna ekki á háum styrk fyrr en gildran er búinn að fanga rottuna því smellurinn er nokkuð hávær.

Download mp3 file (192kbps / 32,1Mb)

Recorder. Sound devices 744 + 302
Mics. Audio Technica BP4025 + Sennheiser ME66
Pix. Canon EosM

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Rode NTG3 vs. Sennheiser ME66 noise

Posted in Óflokkað, tagged , , , , , on 14.2.2012| 1 Comment »

Some months ago my plan was to buy Rode NTG3. I was looking for a low noise and better sounding microphone than ME66 I already own. But after some research at home I found this microphone even worse than ME66 for nature recording.
The audible noise and sensitivity between these two mics was almost equal, but NTG3 have noticeably higher low frequency response.
But what surprised me most was all the noise in NTG3. If something, it was even more than in ME66. But spectrogram shows a shocking pictures for NTG3, a white noise in the whole frequency spectrum up to 50Khz. See spectrogram.
This NTG3 was sent back to the shop, but I was never sure if I did some mistakes in this measurements. So last week I vent to the shop and picked up some recording samples on the same NTG3.
The recorder was Sound devises 744 at 24bit/48Khz. NTG3 was in channel 1 and for comparison ME66 was in channel 2. They were laying side by side and the gain was in full position. Input filter for both channels was at 80Hz, 12dB/oct.
It is no doubt. There is some strange white noise in NTG3.
The sound sample below is about two minutes long. First minute is NTG3 and the second is ME66.
This particular NTG3 can be defective, so I am waiting for next supply of Rode NTG3 in the shop.
I will update this post as soon after I have got a chance to test some other NTG3 mics.
See more pictures and spectrogram in this last test.

Conclusion – Summary

The spectrogram looks very bad for NTG3 but the mic is not as bad as it looks. The ME66 datasheets display referred noise as 10dB(A) and the NTG3 datasheets display referred noise as 13dB(A), so  ME66 has lower referred noise than NTG3. This difference is probably what we see on the spectrogram.  This microphones does not have exactly same bandwidth, as the ME66 has a reduced audio bandwidth which in turn reduces the referred noise. The ME66 top end roll off starts around 14Khz (0dB) and is -6dB at 20KHz, NTG3 is +2dB at 14KHz and -2dB at 20KHz.
NTG3 is RF biased microphones designed to withstand high humidity and harsher environments than the ME66 condenser microphone. So while the NTG3 and ME66 are both shotgun microphones they are designed for different operating conditions.
NTG3 would be my choice for most “normal sound pressure” level. But for quiet nature sounds where most audible sounds are in low level and mid-high frequency, I would choose some other mic.
In my opinion Rode NT1a is one of the best.  Sadly NT1a is not a shotgun or small diaphragm condenser that can be fit nicely in a Blimp. But NT1a have only 5dB(A) noise and that makes the whole different for those who don’t like to use noise reduction software.    See solutions how to fit NT1a in Blimp in NOS and XY setup.
For those who are searching for sound quality in NTG3 I recommend this search: http://www.google.com/search?hl=en&q=NTG3+vs+ME66&meta=
Also this one:
http://www.google.co.uk/search?hl=en&q=NTG3+vs+MKH416&meta=

Download mp3 file (192kbps / 3Mb)

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Æðarfugl á Seltjarnarnesi

Posted in Náttúra, tagged , , , , , on 19.11.2009| Leave a Comment »

Æðarfugl
Vorið 2009 var fremur kalt með köldum norðanáttum. Fuglalíf var því ekki með neinum ágætum þetta vor. Ugglaust brást varp hjá mörgum fuglum, þó að ekki bæri mikið á því á Seltjarnarnesi. Milli kl. 5 og 6 hinn 12. júní, fór ég út á Nes og hljóðritaði hljóð æðarfugls í fjöruborðinu. Allhvöss norðanátt var á Nesinu, svo að í upphafi gekk erfiðlega að finna hljóðnemunum stað, til að vindurinn heyrðist ekki á upptökunum. Besti staðurinn reyndist vera suðurströndin í skjóli við grjótgarð og melgresi. Í flæðarmálinu voru kollur með nokkra unga og blikar, sem voru að atast sín á milli og í kollunum. Það kom mér á óvart, hversu nálægt ég gat komist fuglunum án þess að það hefði truflandi áhrif á þá. Upptakan hefst með því, að ég set upp hljóðnemanna þar sem hópur æðarfugla er í fæðuleit með buslugangi. Þegar líður á upptökuna, færðust flestir fuglarnir austar með ströndinni (til vinstri) og skriðu þar á land.  Upptakan verður því hljóðbærari eftir því sem á líður. Notast var við tvo Sennheiser ME66 hljóðnema, sem klæddir voru Rycote Softy vindhlífum og stillt upp í ca. 100°. Tekið var upp í 24 bit / 192kHz á Korg MR1000. Upptakan, sem hér heyrist, er líklega besti samfelldi kafli allrar upptökunnar þar eð vindur hafði ekki truflandi áhrif. Þegar líður á upptökuna fjarar undan hljóðnemunum. Myndin er tekin á upptökustað.
Sækja MP3 skrá (192kbps /31Mb)

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