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Posts Tagged ‘AB40 recording’

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First weekend of August I traveled to Ísafjörður in the northwest of Iceland. From Isafjörður I took a daytrip with a boat over to Hesteyri which is located in a nature reserve named Jökulfirðir.
The weather was splendid so it was ideal to bring the recording gear with me and record the atmosphere at Hesteyri. This time I brought with me my newest mic setup I built inside Rycote stereo AG windshield. It is a 40cm spaced AB rig (AB40), a two stereo channels with parallel MKH8020/8040, which is slightly angled outward (around °5).
In Hesteyri I record in several places in a small area. Two of them was on the beach where the waves gently plays the music on the coastline during the rising tide. One of this recording is posted here below.
The wind was about 3-6 m/sec, blowing parallel among the coastline so the wind hit only the other side of the windshield, not front of it.
I used MixPre6. The gain was at 50dB, High pass filter on MKH8020 was 120Hz and on MKH8040 80Hz.
The microphones were placed on tripod 60cm above the ground. During the recording the tide rise so in the end the waves went under the rig.
Background noise is mostly the sea waves further outside the fjord and rivers behind and allaround the fjord. Sometimes the boat is knocking on the pier, 200 m away on the left side.
In post I lower the gain -5dB on MKH8020 and rise the gain +5dB on MKH8040 to keep the audible gain between the mics close to be equal. Use again Hi-Pass filter at 100Hz to minimize wind rumbling noise. and then normalized all three audio clips to 0dB. No low pass filter or noise reduction was used.
Both MKH8020 and MKH8040 sounds pretty similar in this recording, so I guess someone will ask:“ Why use four mics when two seems to be fine?“ “ Why making this four channel rig with this expensive mics?“ The short answer is this. The 8020´s are detecting sound from all 360° while 8040´s is only detecting 180° front of the rig. So if there was something behind the rig, like traffic noise it would been clearly audible with 8020´s, but far less with 8040´s. At this time (in Hesteyri) it was only a silence behind the rig so this is not a ideal recording for omni – cardioid comparison.
Field recording is mostly „once in a time – moment capturing“. So having a two different stereo recording of the same event, it is more likely either recording is OK. Two different recordings also give several opportunities in post.

MKH8020/8040 mixed together.
(Mp3 256kbps / 38Mb)

Only MKH8020
(mp3 256kbps / 5,3Mb)

Only MKH8040
(mp3 256kbps / 5,3Mb)

Recorder: Sound devices MixPre6
Mics: Sennheiser MKH8020/8040 (AB40) in Rycote AG (See pictures)
Pics: Canon EOS-M

Weather: Sunny. Light breeze 3-6 m/sec, ca. 14°C
Location: 66.333261, -22.873719

Auglýsingar

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One year ago I was recording in Skaftafell national park and neighborhood in southeast of Iceland. One of my favorite recording place in this area is not exactly in the park, but on Skeiðarársandur, a huge broad sandy wasteland along Iceland’s south-eastern coast, between the Vatnajökull icecap and the sea.
One of the reason I love this place is the silence. There is almost „nothing“. Just the sand. In the horizon far away is the glacier Vatnajökull on the one side, and on the other side just the sky. The only thing that disturbs this silence is traffic or the wind. So when it is calm during the night and traffic is down it is possible to listen deep into this amazing open space. There is not much life. There is probably only Rock Ptarmigan that lives there all year around. Other species are migrants during the summertime so it is easy to say, Rock Ptarmigan is the residents of silence.
This recording is a recording of silence. Most people will not hear anything in this circumstances, probably only its own heartbeat and notice „they have“ tinnitus. But with best equipment is it possible to listen deeper into this quiet place.
You will hear some birds and insects. With good headphones you will hear the rumble sound of heavy surf on the beach 20 to 30 km far away.
BUT this recording is not completely quiet. So be careful while listening. Two birds, a male and female Rock Ptarmigan, are coming very close, „talking“ loud into your ears (2:05).
It is also worth to listen to another earlier recording from this place. „Stories from Skeiðarársandur„.
Quality open headphones are recommended while listening at low to mid level, or in speakers at low level.

(256kbps / 61Mb)

Recorder: Sound devices 788
Mics: Sennheiser MKH20 (AB40 +5° outward)
Weather: Calm, cloudy, +5°C
Location: 63.969892, -17.160072

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I have published many times recordings from the Nature Reserve Flói in southwest Iceland, so I will not introduce that area again.
During the years I remember couple of times when curious sheeps have disturbed the recording. This is one of them.
This peace is a 30 minutes of nine hour overnight recording. It was recorded between 7 and 8 o´clock in the morning 25th of July 2015.
The recording is not only disturbed by the sheeps, it is also highly disturbed by tourist traffic, especially in the air. Jets are arriving and leaving the country and smaller planes in sightseeing so this peaceful area is not especially quite this time.
Quality open headphones are recommended while listening at medium level.

(256kbps / 57,2Mb)

Recorder: Sound devices 788
Mics: RodeNT1 (NOS) & MKH20 (AB40) as close together as possible
Pix: Canon EOSM
Location: 63.901026, -21.192189
Weather: Calm, cloudy, around 11°C

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Last summer I spend one week at Raufarhöfn, a small village in north east of Iceland, close to the arctic circle. Most of the time it was a fool‘s weather for „quality“ recording. But anyway, I recorded almost 6 to 10 hours every night close to the sore. Most of theese recordings contains rumbling wind noise, but sometimes – very few times, I got what I was looking for.
Here is one of them, recorded 17th of June 2016.
It is early morning. The clock is around four. Birds are busy to protect and teach their young to search for food. Shortly after the recording starts, you can hear a fisherman pass by on his car on way to the harbor. Then later, the fishing boat goes, and passes by on the way to the sea. It takes a long time for the enginenoise to disrepair.
This is a peaceful recording. A typical midsummer morning soundscape at the arctic circle, where the sun never goes down. Many bird spices are in this recording, but mostly Common Eider and their youngs. Also you can hear Oystercatcher , Golden Plover, Purple Sandpiper, Red Necked Phalarope, Whimbrel, Common Snipe, Redwing, Snow Bunting, Svan, Great Northern Diver, Northern Fulmar, Kittiwake, Raven and probably may other.
Quality open headphones are recommended while listening at low to mid level.

(256kbps / 55Mb)

Recorder: Sound Devices 788
Mics. Sennheiser MKH20 (AB40)
Pics: Canon EOS–M

Location: 66.451296, -15.946621
Weather: Light gust, cloudy

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It sounds a bit stupid to record silence. But if the equipment can capture something in the silence you can not hear with your bare ears, then it can be very interesting. For instance, you never know what you will see when you look into the deep space with telescope. You never know what you will hear in the silence with a low noise microphone.
I will not define all my views of different silence, but for sure, silence is never completely quiet and it is my favourite recording material.
Best time to get „silence“ is normally during the night in calm weather after sunny day (like this one). In such moments temperature waves are also calm or in layers, so sound can travel long distances without being disturbed. Noise from one car can travel up to 30 km in open field and if you hear it with your bare ears it will be clearly audible through most quality recording gear today. Amplifying sound with low noise microphone, works like a telescope. It drags weak sound far away closer to your ears. In places where you need to hold your breath to hear probably only your heart beat, it can be a very busy place in your headphones.
But there is also other kind of silence. It is on hot sunny days when wind blows and the air is very unstable. Sound normally does not travel long distances in such circumstances.
One of these days was 18th of July 2016 on the World Listening Day. I was traveling on Kjölur, west highland route in Iceland. The sun was shining all day and the wind was blowing from the south. I took of the main rode and followed a track into Kjalhraun lava field. My plan was to find the mysterious Beinahóll (Bone hill) and the field where Reynistaðabræður (Reynisstada brothers) and almost 200 sheeps lost their lives in a insane weather in September 1780. It is still possible to find bones on this field so for a long time I have bin interested in this tragic story.
But the track through the lava was too ruff for my car so I kept on by food.
Many times for almost three decades it has been my plan to find this place while travelling by bike over Kjölur. I never did it because I was always wearing a green jacket and for superstitions reasons it has been told dangerous.
This time I did not find Beinahól. Instead I started recording the silence in the lava.
The weather was a typical sunny „midday silence“, where the thermal heat from the sun makes the air unstable so sound waves did not travel long distances.
This was one of these days I did not hear any plains or car traffic, even though Kjölur main route was not far away. When I held my breath, I only did hear weak bird song in the distance and some flies around. Because the mics are located close to the ground, you will also hear the wind wipe the ruff lava surface.
This recording is captured with MKH20 microphones and SD744 recorder. Gain was set at 56dB and HPF 80Hz. In post the gain was again raised about 25dB. Below 20Hz and above 10Khz the freq. was pulled down by 25dB.
Quality open headphones are recommended while listening at low to mid level, or in speakers at low level. Hold your breath while listening 🙂

(256Kbps / 46Mb)

Recorder: Sound devices 744
Mics Sennheiser MKH20 (AB40 setup)
Pics. EOS-M
Weather. Sunny, about 18°C, calm up to 3 m/s in gusts
Recording location: 64.77883, -19.42805

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An outwash plain, also called a sandur is a plain formed of glacial sediments deposited by meltwater outwash at the terminus of a glacier. As it flows, the glacier grinds the underlying rock surface and carries the debris along. The meltwater at the snout of the glacier deposits its load of sediment over the outwash plain, with larger boulders being deposited near the terminal morraine, and smaller particles travelling further before being deposited. Sandurs are common in Iceland where geothermal activity accelerates the melting of ice flows and the deposition of sediment by meltwater.
The original sandur from which the general name is derived is Skeiðarársandur, a broad sandy wasteland along Iceland’s south-eastern coast, between the Vatnajökull icecap and the sea. Skeiðarársandur is the largest sandur in the world, covering an area of 1,300 km2 (500 sq mi). Volcanic eruptions under the icecap have given rise to many large glacial bursts (jökulhlaups in Icelandic), most recently in 1996, when the Ring Road was washed away (minor floods have also occurred since then). This road, which encircles Iceland and was completed in 1974, has since been repaired. The 1996 jökulhlaup was caused by the eruption of the Grímsvötn volcano, with peak flow estimated to be 50,000 m3/s (1,800,000 cu ft/s) compared to the normal summer peak flow of 200 to 400 m3/s (7,100–14,100 cu ft/s). Net deposition of sediment was estimated to be 12,800,000 m3 (450,000,000 cu ft).
The main braided channels of Skeiðarársandur are the Gígjukvísl and Skeiðará rivers, which incurred net gains of 29 and 24 cm (11.4 and 9.4 in) respectively during the 1996 jökulhlaup. In the Gígjukvísl there was massive sediment deposition of up to 12 m (39 ft), which occurred closest to the terminus of the glacier. The erosional patterns of Skeiðarársandur can be seen by looking at the centimeter-scale elevation differences measured with repeat-pass laser altimetry (LIDAR) flown in 1996 (pre-flood), 1997, and 2001. Of the overall deposition during the 1996 jökulhlaup, nearly half of the net gain had been eroded 4 years after the flood. These two rivers on the sandur display drastically different erosional patterns. The difference in sediment erosion can be attributed to the 2 km (1.2 mi) wide trench near the terminus where the Gígjukvísl flows, in contrast with the Skeiðará, which has braided flows directly onto the outwash plain. The Gígjukvísl river is where some of the highest level of sediment deposit occurred and also where the largest erosion happened afterward. This indicates that these massive jökulhlaup deposits may have a large geomorphic impact in the short term, but the net change on the surface relief could be minimal after a couple years to a decade. (*Wikipedia)
This recording is just 23 minutes of 1o hours long overnight recording. It is very quiet and highly amplified. The microphones are unexpected located near to Northern Wheatear´s nest which is between stones in old ruins in the middle of Skeiðarársandur. You can hear wing flaps and some kind of a conversation between the birds and the youngsters. The birds sounds a little bit out of phase but that could be either because the bird is mostly behind the microphones, or the stone wall, or because the fury windshield was still soaking wet after heavy rain one hour earlier.
At 1:35 min a thunderous boom sounds from glacier in distance. During the recording the weather changed from calm to be windy.
Quality open headphones are recommended while listening at low to mid level, or in speakers at low level.

Sögur af Skeiðarársandi 1. hluti

Hér er á ferðinni rúmlega 20 mínútna löng upptaka sem er partur af 10 klst langri næturupptöku frá því 29. maí 2016 á Skeiðarársandi. Á sandinum svo til miðjum er hlaðin rúst sem líklega hefur gengt því hlutverki að vera fjárrétt áður en árnar á sandinum voru brúaðar. Í upptökunni má heyra að í vegghleðsluni er hreiður Steindepils. Hann pirrar sig eitthvað á óboðnum gesti þessa nótt, hljóðnemunum, en virðist svo líka eiga einhver samskipti við unga sína með lágværu tísti eða muldri. Heyra má að á þessum rúmu 20 mínútum að veðrið breytist frá því að vera logn yfir í rok.
Mælt er með því að hlusta á upptökuna í góðum opnum heyrnartólum og á miðlungs- lágum hljóðstyrk.

(256kbps / 43Mb)

Recorder: Sound Devices 788
Mics: Sennheiser MKH20 (AB40)
Pix: Canon EOS-M
Weather & time: Clam and windy, Drissle rain, at 2AM
Location: 63.969892, -17.160032

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The Vestmannaeyjar archipelago is young in geological terms. The islands lie in the Southern Icelandic Volcanic Zone and have been formed by eruptions over the past 10,000–12,000 years. The volcanic system consists of 70–80 volcanoes both above and below the sea.[3]
The largest island, Heimaey, has a population of 4,135. The other islands are uninhabited, although six have single hunting cabins. Vestmannaeyjar came to international attention in 1973 with the eruption of Eldfell volcano, which destroyed many buildings and forced a months-long evacuation of the entire population to mainland Iceland. Approximately one fifth of the town was destroyed before the lava flow was halted by application of 6.8 billion litres of cold sea water.[2]
With extremely high precipitation considering the latitude, Vestmannaeyjar features an ET Tundra climate (closely bordering Subpolar Oceanic (Cfc)) under the Köppen climate classification. It is often very windy in the islands, and the highest wind speed measured in Iceland (61 metres per second;140 mph) was recorded in Stórhöfði. The main wind directions are easterly and south-easterly. The islands enjoy the country’s highest average annual temperature, the Gulf Stream having a strong warming effect, especially in winter. (Text Wikipedia)
The following recording was made at Stórhöfði 31st of March 2016 in a windspeed around 20 m. pr/sec

Stormur í Vestmannaeyjum

Upptaka þessi var hljóðrituð hádegi á Stórhöfða þann 31. mars 2016 stuttu áður en viðvera á Stórhöfða varð óbærileg vegna veðurs.
Þarna hvín ansi hátt í stögum á loftnetsmöstrum sem eru sunnan við vitahúsið. Hljóðnemarnir voru hafðir skjólmegin við húsið á meðan á upptöku stóð. Gera má ráð fyrir að vindstyrkur hafi náð þarna 20m/sek en síðar um kvöldið komst vindstyrkur upp í 35m/sek og enn meira í hviðum.

  (mp3 192kbps / 30Mb)

Recorder: Sound devices 744
Mics: Sennheiser MKH20 (AB40)
Pics: Canon EOS-M (see more pictures)
Location: 63°23’58.7″N 20°17’19.2″W

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